Hevea brasiliensis
Follow
Find
2.7K views | +0 today
Your new post is loading...
Your new post is loading...
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Demand fall hits Bridgestone rubber - The Japan Times

Demand fall hits Bridgestone rubber - The Japan Times | Hevea brasiliensis | Scoop.it
Demand fall hits Bridgestone rubber
The Japan Times
Bridgestone Corp., the biggest tire maker, may use 2.6 percent less rubber in the year though December than projected in February as demand in the U.S.
more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Natural rubber output may rise marginally - Hindu Business Line

Natural rubber output may rise marginally - Hindu Business Line | Hevea brasiliensis | Scoop.it
Natural rubber output may rise marginally Hindu Business Line Natural rubber production in the country in 2012-13 is provisionally estimated at 9.12 lakh tonnes, with a slight increase of 0.9 per cent compared with the 4.8 per cent increase in...
more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Novel bacterial endophytes from Hevea brasiliensis as biocontrol agent against Phytophthora leaf fall disease - Online First - Springer

Novel bacterial endophytes from Hevea brasiliensis as biocontrol agent against Phytophthora leaf fall disease - Online First - Springer | Hevea brasiliensis | Scoop.it
Biswapriya Biswavas Misra's insight:
Abstract

Bacterial endophytes offer control against many diseases of crop plants as potential biocontrol agents. Antagonistic bacterial endophytes acting against Phytophthora meadii have been screened from leaf, petiole and root tissues of Hevea brasiliensis. Six bacterial endophytes could exhibit more than 50 % inhibition of P. meadii, among which EIL-2, from disease-free zones showed a maximum of 62.5 % inhibition. The isolate EIL-2 was characterized as Alcaligenes sp. and the other isolates were identified as Pseudomonas aeruginosa. 16S rDNA sequence analysis showed that there existed genetic variation among the five isolates of P. aeruginosa from different tissues of the plant indicating the tissue type adaptation of the isolates. Dual culture technique with endophyte EIL-2 completely arrested the growth of P. meadii when inoculated prior to pathogen. The bioassay with EIL-2 in H. brasiliensis clones, RRII 105 showed 43 % reduction of lesion size on infected leaves whereas in RRIM 600 it was only 30 %.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Abstract: Quantitative Trait Loci Associated with Rubber Production in Prickly Lettuce (Lactuca serriola L.) (Plant and Animal Genome XXI Conference)

Biswapriya Biswavas Misra's insight:

Alternative sources of natural rubber are of interest due to economic, biological, and political threats to current supplies. Prickly lettuce (Lactuca serriola L.) is one of few species that synthesizes high molecular weight natural rubber. Genotypic analysis was conducted on an F2 segregating prickly lettuce population to discover genetic regions linked to natural rubber production. In total, 461 EST-SSRs were screened against the crossed parents. A genetic linkage map was created using 89 polymorphic markers. Three markers had no linkage and five dominant markers did not map leaving 81 mapped markers in 12 linkage groups. Seventeen phenotypic measurements were taken from four main categories, latex components, rubber qualities, leaf measurements, and growth patterns. Interval mapping (IM) and multiple QTL mapping (MQM) identified QTL that had LOD score significance. Rubber molecular weight had a QTL on linkage group 8 near markers WSULs-21, WSULs-374.2, and WSULs-210. Dispersity was linked to an unmapped marker, WSULs-374.1. Leaf perimeter and lobing had QTL on linkage group 8 near markers WSULs-102 and WSULs-212. Stem counts and growth habit had QTL on linkage group 4 near marker WSULs-304. Herbivory, plants that had been grazed or not grazed, had a surprising QTL on linkage group 8 between markers WSULs-12 and WSULs-21. The discovered QTL and corresponding markers are genetic resources for understanding rubber biosynthesis in prickly lettuce and useful in marker assisted selection (MAS) breeding. Prickly lettuce is an excellent candidate for elucidating the rubber synthesis mechanism and has potential as a crop plant for rubber production.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Comparative Genomics in Euphorbiaceae - Springer

Comparative Genomics in Euphorbiaceae - Springer | Hevea brasiliensis | Scoop.it
Biswapriya Biswavas Misra's insight:
Abstract

Euphorbiaceae is a family of economically important plants such as cassava, rubber tree, Jatropha curcas and castor bean that includes about 322 genera and 8,900 species endemic to diverse habitats extending from arid regions to humid tropics. The genome resources for the important members of this family are being developed. However, lack of significant understanding of the synteny and diversity of genes among members of Euphorbiaceae makes it difficult to design breeding strategies to manipulate genetic stocks. The comparative genomics of fatty acid biosynthesis in selected members of Euphorbiaceae not only would allow the development of candidate gene markers, but also would provide functional basis for selective breeding of oil accumulation and composition in oilseed members of this family. Interestingly, a high rate of EST-SSRs and SSRs transferability has been reported among different genera and comparative analysis between cassava and castor bean genomes has shown genome duplication and synteny among these two economically important species. Although, a number of genomic aspects of Euphorbiaceae have been explored, there is still a long way to unveil other approaches such as development of genetic and comparative maps to accelerate breeding efficiency and increase commercial outputs of economically important plants like Jatropha.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

ScienceDirect.com - Journal of Plant Physiology - Molecular and biochemical characterization of a cyanogenic β-glucosidase in the inner bark tissues of rubber tree (Hevea brasiliensis Muell. Arg.)

ScienceDirect.com - Journal of Plant Physiology - Molecular and biochemical characterization of a cyanogenic β-glucosidase in the inner bark tissues of rubber tree (Hevea brasiliensis Muell. Arg.) | Hevea brasiliensis | Scoop.it
Biswapriya Biswavas Misra's insight:
Abstract

Tapping causes the loss of large amounts of latex from laticifers and subsequently enhances latex regeneration, a high carbon- and nitrogen-cost activity in rubber tree. It is suggested that a 67 kDa protein associated with protein-storing cells in the inner bark tissues of rubber tree plays an important role in meeting the nitrogen demand for latex regeneration. Here, the 67 kDa protein was further characterized by a combination of cell biological, molecular biological and biochemical techniques. Immunogold labeling showed that the 67 kDa protein was specifically localized in the central vacuole of protein-storing cells. A full-length cDNA, referred to as HbVSP1, was cloned. The HbVSP1 contained a 1584 bp open reading frame encoding a protein of 527 amino acids. The putative protein HbVSP1 shared high identity with the P66 protein from rubber tree and proteins of the linamarase, and bg1A from cassava (Manihot esculenta). HbVSP1 contained the active site sequences of β-glucosidase, TFNEP and I/VTENG. In vitro analysis showed that the 67 kDa protein exhibited the activity of both β-glucosidase and linamarase and was thus characterized as a cyanogenic β-glucosidase. Proteins immuno-related to the 67 kDa protein were present in leaves and lutoids of laticifers. Tapping down-regulated the expression of HbVSP1, but up-regulated the expression of genes encoding the key enzymes for rubber biosynthesis, while the effect of resting from tapping was the reverse. Taken together, the results suggest that the 67 kDa protein is a vacuole-localized cyanogenic β-glucosidase encoded by HbVSP1 and may have a role in nitrogen storage in inner bark tissues of trunk during the leafless periods when rubber tree is rested from tapping.

Keywords
more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

(WO2013039378) A METHOD FOR REGULATING CYTOSOLIC ISOPRENOID BIOSYNTHESIS IN HEVEA BRASILIENSIS

Biswapriya Biswavas Misra's insight:

The present invention discloses an isolated polynucleotide encoding an enzyme for catalyzing cytosolic biosynthesis of isopentenyl diphosphate, dimefhylallyl diphosphate or the combination thereof in the plant of Hevea brasiliensis, comprising nucleotide sequence set forth in SEQ ID NO. 1, SEQ ID NO. 3, SEQ ID NO. 5, SEQ ID NO. 7, SEQ' ID NO. 9 or any complementary sequence thereof; and a method for enhancing cytoplasmic availability and functionality of the enzyme, comprising the steps of predicting catalytic domain, signal peptide or membrane-spanning domain of the enzyme; introducing a point mutation to the predicted catalytic domain, signal peptide or membrane-spanning transmembrane domain; and expressing the mutated catalytic domain, signal peptide or membrane-spanning transmembrane domain in a plant cell, tissue or organ of Hevea brasiliensis. The present invention also relates to an isolated polypeptide encoded by the polynucleotide, a recombinant gene construct comprising the polynucleotide, a transformant and a transgenic plant comprising the recombinant gene construct, with enhanced production of cytosolic isoprenoid towards rubber production.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Endophytic fungi from Peruvian highland and lowland habitats form distinctive and host plant-specific assemblages - Online First - Springer

Endophytic fungi from Peruvian highland and lowland habitats form distinctive and host plant-specific assemblages - Online First - Springer | Hevea brasiliensis | Scoop.it
Biswapriya Biswavas Misra's insight:
Abstract

Biodiversity and biogeography of leaf-inhabiting endophytic fungi have not been resolved yet. This is because host specificity, life cycles and species concepts, in this heterogeneous ecological guild of plant-associated microfungi, are far from being understood. Even though it is known that culture-based collection techniques are often biased, this has been the method of choice for studying fungal endophytes. Isolation of fungal endophytes only through culture-based methods could potentially mask slow growing species as well as species with low prevalence, preventing the capture of the communities’ real diversity and composition. This bias can be partially resolved by the use of cultivation-independent approaches such as direct sequencing of plant tissue by next generation techniques. Irrespective of the chosen sampling method, an efficient analysis of community ecology is urgently needed in order to evaluate the driving forces acting on fungal endophytic communities. In the present study, endophytic ascomyceteous fungi from three different plant genera (Vasconcellea microcarpa, Tillandsia spp., and Hevea brasiliensis) distributed in Peru, were isolated through culture-based sampling techniques and sequenced for their ITS rDNA region. These data sets were used to assess host preferences and biogeographic patterns of endophytic assemblages. This study showed that the effect of the host’s genetic background (identity) has a significant effect on the composition of the fungal endophytic community. In other words, the composition of the fungal endophytic community was significantly related to their host’s taxonomic identity. However, this was not true for all endophytic groups, since we found some endophytic groups (e.g. Xylariales and Pleosporales) occurring in more than one host genus. Findings from this study promote the formulation of hypotheses related to the effect of altitudinal changes on the endophytic communities along the Eastern Andean slopes. These hypotheses and perspectives for fungal biodiversity research and conservation in Peru are addressed and discussed.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Fungsi Hidrologi Kebun Karet (Hevea brasiliensis Muell. Arg) dalam Mereduksi Besaran Curah Hujan Bersih (Hydrological Function of Rubber Plantation (Hevea brasiliensis Muell. Arg) to Reducing the M...

Fungsi Hidrologi Kebun Karet (Hevea brasiliensis Muell. Arg) dalam Mereduksi Besaran Curah Hujan Bersih (Hydrological Function of Rubber Plantation (Hevea brasiliensis Muell.
Biswapriya Biswavas Misra's insight:
Abstract

 

Forest conversion resulted in loss of various forest functions, mainly the hydrological function changes. Mostly of the conversion of forests were to be oil palm and rubber plantations. Rubber plantation although an artificial ecosystem but had the similarity to forest condition. The purpose of this research was to examine the role of rubber plantation to reducing net rainfall that reached the plantation ground through the interception loss mechanism. Water volume balance was used to measure the interception loss.The results showed that the interception on the rubber plantation increased with the increasing of rubber age. Through fall tend to decreased with the increasing of rubber age were 60.56%, 53.62% and 43.79% of the total precipitation for 10 years, 15 years and 25 years of age respectively during the research period. The percentage of stem flow was 5.98% 7.94%, and 4.39% of total precipitation for 10 years, 15 years and 25 years of age respectively. The percentage of interception on rubber plantation for 10 years, 15 years and 25 years were 331.76 mm (19.6%), 428.73 mm (25.3%), and 545.79 mm (51.81%) of the total rainfall (1053.3 mm) respectively. Rubber plantation had good potency to reducing the net rainfall that reached the ground. This condition also informed that rubber plantation could reduce the risk of floods occurrence.
Key words: rubber plantation, net rainfall, interception, through fall, stem flow
more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Physical and mechanical properties of few exotic trees grown in Konkan region of Maharashtra. - CAB Direct

The Physical and mechanical properties of air-dried wood of three locally important exotic tree species viz.
Biswapriya Biswavas Misra's insight:
Abstract

The Physical and mechanical properties of air-dried wood of three locally important exotic tree species viz. Acacia auriculiformis, Hevea brasiliensis, and Acacia mangium, widely preferred for mass scale plantations in Konkan region of Maharashtra were determined. It was found that the mechanical properties were generally higher for Acacia auriculiformis as compared to other two species in study. In Acacia auriculiformis, attributes such as specific gravity, compressive stress at limit of proportionality perpendicular to grain and end hardness of A. auriculiformis were also greater than the values reported for Teak (Tectona grandis). However, the physical and mechanical properties of Hevea brasiliensis and Acacia mangium were inferior to Teak, except end hardness of Hevea brasiliensis was superior than Teak.

Up to 9,061 more results found for "hevea brasiliensis"
more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Cambridge Journals Online - Abstract

Cambridge Journals Online - Abstract | Hevea brasiliensis | Scoop.it
****
Biswapriya Biswavas Misra's insight:

SUMMARY

Understanding the growth dynamics of fine roots and their contribution to soil organic carbon and nutrient pools is crucial for estimating ecosystem carbon and nutrient cycling and how these are influenced by climate change. Rubber is cultivated in more than 10 million hectare globally and the area under rubber cultivation is fast expanding due to socio-economic reasons, apart from the importance given to this species for eco-restoration of degraded lands. An experiment was conducted to quantify fine root production, fine root turnover and carbon and nutrient cycling through fine roots in rubber plantations with different soil nutrient status and rainfall pattern. Fine root production was estimated by sequential coring and ingrowth core methods. Fine root decomposition was determined by the litter bag technique. Carbon and nutrient contents in fine roots were determined and their turnover was computed. Fine root biomass in the top 0–7.5-cm soil layer showed significant seasonal fluctuation and the fluctuations were particularly wide during the transition period from the dry season to the rainy season. Fine root production estimated by the different methods was significantly higher at the lower fertility site and during the higher soil moisture stress year. Fine root turnover ranged from 1.04 to 2.29 year−1. Root carbon and nutrient status showed seasonal variation and lower status was observed during the rainy season. The annual recycling of C, N, P, K, Ca and Mg through fine roots ranged from 590 to 1758, 30 to 85, 3 to 12, 13 to 31, 11 to 35 and 6 to 13 kg ha−1, respectively. Substantial quantities of carbon and nutrients were recycled annually in rubber plantations through fine roots. When soil moisture and nutrient stress were more severe, fine root production, turnover and carbon and nutrient recycling through fine roots were higher.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Molecular Systems Biology

Molecular Systems Biology | Hevea brasiliensis | Scoop.it
Nature - the world's best science and medicine on your desktop
Biswapriya Biswavas Misra's insight:

Genome-modification technologies enable the rational engineering and perturbation of biological systems. Historically, these methods have been limited to gene insertions or mutations at random or at a few pre-defined locations across the genome. The handful of methods capable of targetedgene editing suffered from low efficiencies, significant labor costs, or both. Recent advances have dramatically expanded our ability to engineer cells in a directed and combinatorial manner. Here, we review current technologies and methodologies for genome-scale engineering, discuss the prospects for extending efficient genome modification to new hosts, and explore the implications of continued advances toward the development of flexibly programmable chasses, novel biochemistries, and safer organismal and ecological engineering.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Dry weather affects rubber plants in northeast India - Times of India

Dry weather affects rubber plants in northeast India - Times of India | Hevea brasiliensis | Scoop.it
Times of India
Dry weather affects rubber plants in northeast India
Times of India
"As an immediate measure, growers are advised to provide shade to young rubber plants until the rains arrive.
more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Rubber prices seen to be volatile this week - The Star Online - The Star Online

Rubber prices seen to be volatile this week - The Star Online - The Star Online | Hevea brasiliensis | Scoop.it
Rubber prices seen to be volatile this week - The Star Online
The Star Online
KUALA LUMPUR: Malaysian rubber prices are expected to be volatile this week against the backdrop of weak Chinese data that has sapped the outlook for demand, dealers said.
more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Molecular Analysis of Botryodiplodia theobromae Isolates from Rubber i Vietnam Using rDNA ITS Sequencing and ISSR Marker

Biswapriya Biswavas Misra's insight:
A total of 20 isolates ofBotryodiplodia theobromaefrom differentHevea clonesgrowing in various rubber plantationsin Vietnam was analysed using Ribosomal DNA ITS(rDNA ITS) sequencing and Inter Simple Sequence Repeat (ISSR) markers.Analysis ofrDNA-ITS sequencesrevealed that20 studied isolates have the same size(541 bp)and thesesequencesare identical. BLAST search showed that the rDNA-ITS sequences of the studiedisolates was 98- 99% similarity to that ofrDNA-ITS ofB. theobromae deposited inGenBank. The identical sequences in rDNA-ITS region implied high conservation of thisregion in the genome of the studied isolates. ISSR analysis using 16 primers produced atotal of 214 DNA bands, of whichthe polymorphic DNA bands was accounted for 76.6%.The phylogenetic tree producedfrom UPGMA analysis based onNei and Li coefficientdivided 20 isolates intofour genetic clusters. Analysis of these clusters showed therelationshipamong isolates from different regionsand no relationship between geneticgroups and the host origins (rubber clones). Some unique isolates that need further

investigation

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Abstract: Analysis of Bark Transcriptome from Two Contrasting Clones of the Rubber Tree (Hevea brasiliensis) (Plant and Animal Genome XXI Conference)

Biswapriya Biswavas Misra's insight:

The rubber tree (Hevea brasiliensis) is a native tree from Amazon region that has great economic importance for being the largest source of natural rubber in the world.  Natural rubber is used in many sectors because it is flexible, resistant, impermeable to liquids and abrasion resistant. Moreover there is no synthetic substitute with these physical properties nowadays. Rubber tree bark contains the laticifers where latex is synthesized and stored. There are two rubber biosysthesis pathways: mevalonate (MVA) and 2-C-methyl-D-erythritol 4-phosphate (MEP). MVA pathway has 6 enzymes and MEP has 8 enzymes involved in rubber pathway biosynthesis. Here we analyzed rubber tree bark transcriptome using Illumina platform for functional characterization and molecular marker development for breeding programs. Two different rubber tree clones were used for paired-end sequencing. We performed de novo assembly with 144 million reads using CLC Genomics Workbench generated 152 thousand contigs and N50=1.414 pb.  Contigs longer than 400 pb were selected with a total of 50374 contigs without contaminants sequences. Approximately 32 thousand contigs had similarity with nr protein database and 21725 sequences were annotated in 37781 Gene Ontology terms. Also, an analysis of Kyoto Encyclopedia of Genes and Genomes (KEGG) Pathway was made with the annotated sequences. Among the 5 main categories, metabolism was the most represented. A total of 25 and 40 sequences are involved in MVA and MEP rubber biosynthesis pathways, respectively. These data are important to develop functional single nucleotide polymorphisms markers (SNPs) for rubber tree breeding programs.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Thailand adds funds to joint rubber venture - Pattaya Mail

Thailand adds funds to joint rubber venture - Pattaya Mail | Hevea brasiliensis | Scoop.it
Thailand adds funds to joint rubber venture
Pattaya Mail
BANGKOK, March 26 – The Thai cabinet today approved an injection of US$3.3 million (Bt109.89 million) into the tripartite rubber consortium for rubber price stability in the global market.
more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

MY2012000213 A METHOD FOR REGULATING PLASTIDIAL ISOPRENOID BIOSYNTHESIS IN HEVEA BRASILIENSIS

MY2012000213 A METHOD FOR REGULATING PLASTIDIAL ISOPRENOID BIOSYNTHESIS IN <i>HEVEA BRASILIENSIS</i> | Hevea brasiliensis | Scoop.it
A METHOD FOR REGULATING PLASTIDIAL ISOPRENOID BIOSYNTHESIS IN HEVEA BRASILIENSIS
Biswapriya Biswavas Misra's insight:

The present invention relates to an isolated polypeptide for catalyzing plastidial biosynthesis of isopentenyl diphosphate, dimethylallyl diphosphate or the combination thereof in the plant of Hevea brasiliensis, comprising amino acid sequence set forth in SEQ ID NO. 2, SEQ ID NO. 4, SEQ ID NO. 6, SEQ ID NO. 8, SEQ ID NO. 10 or SEQ ID NO. 12; and a method for catalyzing the biosynthesis of isopentenyl diphosphate, dimethylallyl diphosphate or the combination thereof for enhancing the biosynthesis of natural rubber from its precursors. The present invention also relates to an isolated polynucleotide encoding the polypeptide, a recombinant gene construct comprising the polynucleotide, a transformant and a transgenic plant comprising the recombinant gene construct.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Ant diversity in rubber plantation (Hevea brasiliensis) of Cambodia

Biswapriya Biswavas Misra's insight:
ABSTRACT.We investigated the arboreal and ground ant fauna in rubberplantations (Hevea brasiliensis) in Kampong Cham Province, Cambodia. Atotal of 41 species of Formicidae, belonging to 28 genera in seven subfamilies,were collected. In three types of rubber plantations examined 25, 23 and 27species of ants were found in a six-year-old, a nine-year-old and an old (>50-year) plantation, respectively. Total species richness of ants did not differsignificantly among the three types of plantations. The most common antspecies were the nativeOecophylla smaragdina, which occurred in 50% of thesamples, and the exotic invadersTapinoma melanocephalumandAnoplolepisgracilipeswhich were in 27 % and 13 % of samples respectively. The olderplantation, especially, had abundant leaf litter and fertile soil, and some rarermore cryptic ant genera, e.g.Calyptomyrmex,PyramicaandDiscothyrea, were

found in the leaf litter

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

CARBON AND NUTRIENT CYCLING THROUGH FINE ROOTS IN RUBBER (HEVEA BRASILIENSIS) PLANTATIONS IN INDIA

CARBON AND NUTRIENT CYCLING THROUGH FINE ROOTS IN RUBBER (HEVEA BRASILIENSIS) PLANTATIONS IN INDIA | Hevea brasiliensis | Scoop.it
****
Biswapriya Biswavas Misra's insight:

SUMMARY

Understanding the growth dynamics of fine roots and their contribution to soil organic carbon and nutrient pools is crucial for estimating ecosystem carbon and nutrient cycling and how these are influenced by climate change. Rubber is cultivated in more than 10 million hectare globally and the area under rubber cultivation is fast expanding due to socio-economic reasons, apart from the importance given to this species for eco-restoration of degraded lands. An experiment was conducted to quantify fine root production, fine root turnover and carbon and nutrient cycling through fine roots in rubber plantations with different soil nutrient status and rainfall pattern. Fine root production was estimated by sequential coring and ingrowth core methods. Fine root decomposition was determined by the litter bag technique. Carbon and nutrient contents in fine roots were determined and their turnover was computed. Fine root biomass in the top 0–7.5-cm soil layer showed significant seasonal fluctuation and the fluctuations were particularly wide during the transition period from the dry season to the rainy season. Fine root production estimated by the different methods was significantly higher at the lower fertility site and during the higher soil moisture stress year. Fine root turnover ranged from 1.04 to 2.29 year−1. Root carbon and nutrient status showed seasonal variation and lower status was observed during the rainy season. The annual recycling of C, N, P, K, Ca and Mg through fine roots ranged from 590 to 1758, 30 to 85, 3 to 12, 13 to 31, 11 to 35 and 6 to 13 kg ha−1, respectively. Substantial quantities of carbon and nutrients were recycled annually in rubber plantations through fine roots. When soil moisture and nutrient stress were more severe, fine root production, turnover and carbon and nutrient recycling through fine roots were higher.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Genetic transformation and regeneratio of Hevea brasiliensis transgenic plan with GAI gene by microparticle bombardment

Biswapriya Biswavas Misra's insight:
A typhoon is a major natural disaster in the cultivation areas of Hevea brasiliensis in China.In this study, we report a method for the transformation and regeneration of H. brasiliensistransgenic plants expressing the Arabidopsis gibberellic acid insensitive (GAI) gene to induce thedwarfing phenotype. A pBI121vector comprising CaMV35S promoter, kanamycin resistance gene(nptII), beta-glucuronidase (GUS) reporter gene, and GAI gene was used. The embryoid induction ratewas 3.21% using a 40-day-old calli as target with 1100 psi helium pressure and 9 cm target distance.Kanamycin-selected calli and embryos were positive for GUS activity in histochemical assays. Atransgenic line and 21 sub-plantlets were positive for GAI gene amplification using the polymerasechain reaction. The integration of the GAI gene was confirmed by Southern blot and showed a singlecopy insertion. These results illustrate the advantages of using microparticle bombardment for stableplant transformation in H. brasiliensis with possible applications in other plant species. 
more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Cambridge Journals Online - Abstract

Cambridge Journals Online - Abstract | Hevea brasiliensis | Scoop.it
****
Biswapriya Biswavas Misra's insight:

SUMMARY

Understanding the growth dynamics of fine roots and their contribution to soil organic carbon and nutrient pools is crucial for estimating ecosystem carbon and nutrient cycling and how these are influenced by climate change. Rubber is cultivated in more than 10 million hectare globally and the area under rubber cultivation is fast expanding due to socio-economic reasons, apart from the importance given to this species for eco-restoration of degraded lands. An experiment was conducted to quantify fine root production, fine root turnover and carbon and nutrient cycling through fine roots in rubber plantations with different soil nutrient status and rainfall pattern. Fine root production was estimated by sequential coring and ingrowth core methods. Fine root decomposition was determined by the litter bag technique. Carbon and nutrient contents in fine roots were determined and their turnover was computed. Fine root biomass in the top 0–7.5-cm soil layer showed significant seasonal fluctuation and the fluctuations were particularly wide during the transition period from the dry season to the rainy season. Fine root production estimated by the different methods was significantly higher at the lower fertility site and during the higher soil moisture stress year. Fine root turnover ranged from 1.04 to 2.29 year−1. Root carbon and nutrient status showed seasonal variation and lower status was observed during the rainy season. The annual recycling of C, N, P, K, Ca and Mg through fine roots ranged from 590 to 1758, 30 to 85, 3 to 12, 13 to 31, 11 to 35 and 6 to 13 kg ha−1, respectively. Substantial quantities of carbon and nutrients were recycled annually in rubber plantations through fine roots. When soil moisture and nutrient stress were more severe, fine root production, turnover and carbon and nutrient recycling through fine roots were higher.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

Abstract

Biswapriya Biswavas Misra's insight:

Abstract  The chemical constituents of the Hevea brasiliensis skim were studied. Compounds were isolated and purified by silica gel column chromatography and Sephadex LH-20. Their structures were identified by physicochemical properties and spectral analyses. Thirteen compounds were obtained and the twelve ones of them were identified : Friedelin (Ⅰ), Lupeol (Ⅱ), β-Sitosterol (Ⅲ), Hexadecanoic acid (Ⅳ), Heptadecanoic acid (Ⅴ), Daucosterol (Ⅵ), Nicotine acid (Ⅶ), Succinic acid (Ⅷ), Gallac acid (Ⅸ), Fructose (Ⅹ), Quebrachitol (Ⅺ), 6-hydroxy-cleistopholine (Ⅻ). Compounds Ⅰ, Ⅱ, Ⅵ, Ⅶ Ⅸ and Ⅻ were isolated from Hevea brasiliensis skim for the first time.

more...
No comment yet.
Scooped by Biswapriya Biswavas Misra
Scoop.it!

PacC and pH--dependent transcriptome of the mycotrophic fungus Trichoderma ... - 7thSpace Interactive (press release)

PacC and pH--dependent transcriptome of the mycotrophic fungus Trichoderma ...
more...
No comment yet.