Molecular Plant Microbe Interaction
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Effector-Triggered Immunity: From Pathogen Perception to Robust Defense - Annual Review of Plant Biology, 66(1):

Effector-Triggered Immunity: From Pathogen Perception to Robust Defense - Annual Review of Plant Biology, 66(1): | Molecular Plant  Microbe Interaction | Scoop.it
RT @BenjPetre: Effector-Triggered Immunity: From Pathogen Perception to Robust Defense http://t.co/Ylvm7wWCqD
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Fungal plant pathogens similar to flu viruses: difficult to be immune to them all - HealthCanal.com

Fungal plant pathogens similar to flu viruses: difficult to be immune to them all - HealthCanal.com | Molecular Plant  Microbe Interaction | Scoop.it
Fungal plant pathogens similar to flu viruses: difficult to be immune to them all
HealthCanal.com
Fungi have genes that produce proteins, called effectors, which cause disease in plants.
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Breaking dogmas: the plant vascular pathogen Xanthomonas albilineans is able to invade non-vascular tissues despite its reduced genome

Breaking dogmas: the plant vascular pathogen Xanthomonas albilineans is able to invade non-vascular tissues despite its reduced genome | Molecular Plant  Microbe Interaction | Scoop.it

Scooped from: Open Biology, 2014

Authors: Imène Mensi, Marie-Stéphanie Vernerey, Daniel Gargani, Michel Nicole and Philippe Rott

 

Abstract:

Xanthomonas albilineans, the causal agent of sugarcane leaf scald, is missing the Hrp type III secretion system that is used by many Gram-negative bacteria to colonize their host. Until now, this pathogen was considered as strictly limited to the xylem of sugarcane. We used confocal laser scanning microscopy, immunocytochemistry and transmission electron microscopy (TEM) to investigate the localization of X. albilineans in diseased sugarcane. Sugarcane plants were inoculated with strains of the pathogen labelled with a green fluorescent protein. Confocal microscopy observations of symptomatic leaves confirmed the presence of the pathogen in the protoxylem and metaxylem; however, X. albilineans was also observed in phloem, parenchyma and bulliform cells of the infected leaves. Similarly, vascular bundles of infected sugarcane stalks were invaded by X. albilineans. Surprisingly, the pathogen was also observed in apparently intact storage cells of the stalk and in intercellular spaces between these cells. Most of these observations made by confocal microscopy were confirmed by TEM. The pathogen exits the xylem following cell wall and middle lamellae degradation, thus creating openings to reach parenchyma cells. This is the first description of a plant pathogenic vascular bacterium invading apparently intact non-vascular plant tissues and multiplying in parenchyma cells.


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Freddy Monteiro's curator insight, February 14, 2014 6:41 AM

I was not aware of this journal until now. However the microscopy images in this publication are neat.
Great to see good'ol school transmission electron microscopy images complemented with confocal observations.