Plant health
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Plant health
Research, new developments and findings of organisms, harmful to plants.
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BMC Genomics | Full text | 'Bois noir' phytoplasma induces significant reprogramming of the leaf transcriptome in the field grown grapevine

Phytoplasmas are bacteria without cell walls from the class Mollicutes. They are obligate intracellular plant pathogens which cause diseases in hundreds of economically important plants including the grapevine (Vitis vinifera).
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This study revealed some fundamental aspects of grapevine interactions with the stolbur 'Bois noir' phytoplasma in particular and some plant interactions with phytoplasmas in general. In addition, the results of the study will likely have an impact on grape improvement by yielding marker genes that can be used in new diagnostic assays for phytoplasmas or by identifying candidate genes that contribute to the improved properties of grape.

By: Hren M, Nikolić P, Rotter A, Blejec A, Terrier, Ravnikar M, Dermastia M, Gruden K; BMC Genomics 2009, 10:460 doi:10.1186/1471-2164-10-460

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Phytoplasmas, vectors and measures for disease control

Phytoplasmas, vectors and measures for disease control | Plant health | Scoop.it

The most widespread phytoplasmas, vectors and measures for disease control in Slovenia


Phytoplasmas, as fastidious wall-less mollicutes, colonize phloem tissue of many plant species, including grapevine and fruit trees. They are transmitted between plants by vegetative propagation and by sap-sucking insect vectors, which enable spread of the diseases.

‘Candidatus Phytoplasma mali’, associated with apple proliferation, ‘Ca. P. prunorum’, associated with European stone fruit yellows and ‘Ca. P. pyri’, associated with pear decline, were detected in several fruit-growing areas of Slovenia. The most widespread phytoplasma on grapevine in Slovenia was the stolbur phytoplasma, (‘bois noir’), but ‘Flavescence dorée’ phytoplasma, associated with serious disease of grapevine, has been detected in Slovenian vineyards.


Mehle N  et al. (2012) The most widespread phytoplasmas, vectors and measures for disease control in Slovenia.- Phytopathogenic Mollicutes 2011(1)2 p 65- 76. Online ISSN : 2249-4677. IndianJournals.com 

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PRO/PL> Witches' broom, longan | Geostrategic Forecasting

PRO/PL> Witches' broom, longan | Geostrategic Forecasting | Plant health | Scoop.it

Witches' broom disease is sweeping through more than 60 percent of the longan-growing area in the Cuu Long (Mekong) Delta, leaving many farmers with severe losses, according to the Plant Protection Department. The disease appeared in Viet Nam in 2003 from infected longan (Dimocarpus longan) strains imported from neighbouring countries, according to experts. There are no effective measures to prevent or control the disease.

 

Comment: The news has been published via International Society of Infectious Diseases. For some plant diseases only very few data is available on the extent of the disease, on its biology and epidemiology. Since witches' broom symptoms can apear on differnet fruit species of Prunus, Malus and other fruit trees in other parts of the world, also information on their control should be searched there. The causal agent is phytoplasma, which can be determined only in lab diagnostic procedure. In general the spread of the disease is possible by care for healthy planting material and control of insect vectors. Many new findings have become available in recent years about the transmission and epidemiology of phytoplasma diseases.

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