Plant Microbe Interactions
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Rescooped by Cassandra Samuel from Plants and Microbes
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Nature Genetics: Oomycete pathogens encode RNA silencing suppressors (2013)

Nature Genetics: Oomycete pathogens encode RNA silencing suppressors (2013) | Plant Microbe Interactions | Scoop.it

Effectors are essential virulence proteins produced by a broad range of parasites, including viruses, bacteria, fungi, oomycetes, protozoa, insects and nematodes. Upon entry into host cells, pathogen effectors manipulate specific physiological processes or signaling pathways to subvert host immunity. Most effectors, especially those of eukaryotic pathogens, remain functionally uncharacterized. Here, we show that two effectors from the oomycete plant pathogen Phytophthora sojae suppress RNA silencing in plants by inhibiting the biogenesis of small RNAs. Ectopic expression of thesePhytophthora suppressors of RNA silencing enhances plant susceptibility to both a virus and Phytophthora, showing that some eukaryotic pathogens have evolved virulence proteins that target host RNA silencing processes to promote infection. These findings identify RNA silencing suppression as a common strategy used by pathogens across kingdoms to cause disease and are consistent with RNA silencing having key roles in host defense.


Via Kamoun Lab @ TSL
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Bacterial Transfer Of Resistance Genes Targeted By Scientists - RedOrbit

Bacterial Transfer Of Resistance Genes Targeted By Scientists - RedOrbit | Plant Microbe Interactions | Scoop.it
RedOrbitBacterial Transfer Of Resistance Genes Targeted By ScientistsRedOrbitImage Caption: Researchers report they have found a way to disrupt the spread of antibiotic-resistance genes among S.
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Insect-damaged wheat: suni bug, cereal bug, sunn pest, wheat bug, shield bug, shell bug | Global Milling News

Insect-damaged wheat: suni bug, cereal bug, sunn pest, wheat bug, shield bug, shell bug | Global Milling News | Plant Microbe Interactions | Scoop.it
Wheat quality can be defined in terms of inherent quality attributes those under genetic control and seasonal quality attributes. One of the parameters of wheat quality is insect-damage.
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MPMI: Nonhost Resistance of Rice to Rust Pathogens

MPMI: Nonhost Resistance of Rice to Rust Pathogens | Plant Microbe Interactions | Scoop.it

Rice is atypical in that it is an agricultural cereal that is immune to fungal rust diseases. This report demonstrates that several cereal rust species (Puccinia graminis f. sp tritici, P. triticina, P. striiformis, and P. hordei) can infect rice and produce all the infection structures necessary for plant colonization, including specialized feeding cells (haustoria). Some rust infection sites are remarkably large and many plant cells are colonized, suggesting that nutrient uptake occurs to support this growth. Rice responds with an active, nonhost resistance (NHR) response that prevents fungal sporulation and that involves callose deposition, production of reactive oxygen species, and, occasionally, cell death. Genetic variation for the efficacy of NHR to wheat stem rust and wheat leaf rust was observed. Unlike cereal rusts, the rust pathogen (Melampsora lini) of the dicotyledenous plant flax (Linum usitatissimum) rarely successfully infects rice due to an apparent inability to recognize host-derived signals. Morphologically abnormal infection structures are produced and appressorial-like structures often don't coincide with stomata. These data suggest that basic compatibility is an important determinate of nonhost infection outcomes of rust diseases on cereals, with cereal rusts being more capable of infecting a cereal nonhost species compared with rust species that are adapted for dicot hosts.


Via Kamoun Lab @ TSL
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J Biomol NMR: Solution structure of the Magnaporthe oryzae avirulence protein AvrPiz-t (2013)

J Biomol NMR: Solution structure of the Magnaporthe oryzae avirulence protein AvrPiz-t (2013) | Plant Microbe Interactions | Scoop.it

The AvrPiz-t gene encodes a small protein predicted to be secreted that shows no homology to known proteins and is 108 amino acids in length. AvrPiz-t can suppress programmed cell death (PCD) induced by BAX in tobacco, suggesting that it might contribute to the pathogenicity of M. oryzae. These data suggested that AvrPiz-t functions primarily as a virulence effector contributing to the pathogenicity of M. oryzae. To further understand the mechanism of the pathogenicity-associated function of AvrPiz-t, we determined its solution structure.


Via Kamoun Lab @ TSL
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Traditional breeding outperforms genetic engineering

Traditional breeding outperforms genetic engineering | Plant Microbe Interactions | Scoop.it
Contrary to claims by seed companies, GM crops actually give lower yield, disturbs the plants’ genetic structure and do not assure safety, according to a section of scientists (RT @GMWatch: Traditional breeding outperforms genetic engineering
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Drug-Resistant Superbugs Found in Wild Animals - Wired (blog)

Drug-Resistant Superbugs Found in Wild Animals - Wired (blog) | Plant Microbe Interactions | Scoop.it
Wired (blog)Drug-Resistant Superbugs Found in Wild AnimalsWired (blog)For instance, pigs on livestock farms have been found harboring the bug, likely because farmers give antibiotics to food animals as they grow, another way of encouraging...
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