Plant-Microbe Interaction
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Rescooped by Noriko Inada from Plants and Microbes
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Developmental Cell: Chloroplast Stromules Function during Innate Immunity (2015)

Developmental Cell: Chloroplast Stromules Function during Innate Immunity (2015) | Plant-Microbe Interaction | Scoop.it
Chloroplast stromules are induced during plant immune responsesPro-PCD signals such as SA and H2O2 induce stromulesStromules form dynamic connections with nucleus during immune responsesConstitutively induced stromules enhance PCD during plant immune responses


Inter-organellar communication is vital for successful innate immune responses that confer defense against pathogens. However, little is known about how chloroplasts, which are a major production site of pro-defense molecules, communicate and coordinate with other organelles during defense. Here we show that chloroplasts send out dynamic tubular extensions called stromules during innate immunity or exogenous application of the pro-defense signals, hydrogen peroxide (H2O2) and salicylic acid. Interestingly, numerous stromules surround nuclei during defense response, and these connections correlate with an accumulation of chloroplast-localized NRIP1 defense protein and H2O2 in the nucleus. Furthermore, silencing and knockout of chloroplast unusual positioning 1 (CHUP1) that encodes a chloroplast outer envelope protein constitutively induces stromules in the absence of pathogen infection and enhances programmed cell death. These results support a model in which stromules aid in the amplification and/or transport of pro-defense signals into the nucleus and other subcellular compartments during immunity.


Via Kamoun Lab @ TSL
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mmatshepo sibuyi's curator insight, July 31, 2015 4:49 AM

chloroplast consist of green pigments called chlorophyll that plants use in the process of photosynthesis

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Importin-α-Mediated Nucleolar Localization of Potato Mop-Top Virus TRIPLE GENE BLOCK1 (TGB1) Protein Facilitates Virus Systemic Movement, Whereas TGB1 Self-Interaction Is Required for Cell-to-Cell ...

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The Cyst Nematode Effector Protein 10A07 Targets and Recruits Host Posttranslational Machinery to Mediate Its Nuclear Trafficking and to Promote Parasitism in Arabidopsis

The Cyst Nematode Effector Protein 10A07 Targets and Recruits Host Posttranslational Machinery to Mediate Its Nuclear Trafficking and to Promote Parasitism in Arabidopsis | Plant-Microbe Interaction | Scoop.it
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Curr Opin Plant Biol: Inside plant: biotrophic strategies to modulate host immunity and metabolism (2014)

Curr Opin Plant Biol: Inside plant: biotrophic strategies to modulate host immunity and metabolism (2014) | Plant-Microbe Interaction | Scoop.it
Filamentous plant pathogens that establish biotrophic interactions need to avoid plant immune responses. Recent findings from different pathosystems suggest that sufficient suppression of host immunity is based on the modulation of a rather limited number of host targets. Microbial strategies to target host physiology dependent on the duration of biotrophy, the style of host tissue colonization and the degree of interference with plant development. In this article, we present current concepts in biotrophic virulence strategies and discuss mechanisms of pathogen adaptation and effector specialization.
Via Kamoun Lab @ TSL
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ENHANCED DISEASE RESISTANCE4 Associates with CLATHRIN HEAVY CHAIN2 and Modulates Plant Immunity by Regulating Relocation of EDR1 in Arabidopsis

ENHANCED DISEASE RESISTANCE4 Associates with CLATHRIN HEAVY CHAIN2 and Modulates Plant Immunity by Regulating Relocation of EDR1 in Arabidopsis | Plant-Microbe Interaction | Scoop.it
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TCP transcription factors are critical for the coordinated regulation of ISOCHORISMATE SYNTHASE 1 expression in Arabidopsis thaliana

TCP transcription factors are critical for the coordinated regulation of ISOCHORISMATE SYNTHASE 1 expression in Arabidopsis thaliana | Plant-Microbe Interaction | Scoop.it
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Traffic: Rerouting of plant late endocytic trafficking towards a pathogen interface (2014)

Traffic: Rerouting of plant late endocytic trafficking towards a pathogen interface (2014) | Plant-Microbe Interaction | Scoop.it

The biogenesis and functions of the extrahaustorial membrane (EHM), an intimate interface between plants and filamentous pathogens, are poorly understood. One long-standing puzzle is why several membrane proteins, such as some cell surface receptors, are missing from the EHM. We gained a significant insight into how the EHM is formed and made an important step in understanding why certain membrane proteins are missing from the EHM. We discovered that late endosomes targeted to the vacuoles are rerouted to the EHM. This process is dynamic because, upon activation, a cell surface immune receptor traffics to this compartment. We propose a model in which some cell surface receptors that undergo ligand induced endocytosis and traffic to late endosomes get sorted to the host pathogen interface, instead of taking the default route to the vacuole as in uninfected cells.

 

--- A number of plant pathogenic and symbiotic microbes produce specialized cellular structures that invade host cells where they remain enveloped by host-derived membranes. The mechanisms underlying the biogenesis and functions of host-microbe interfaces are poorly understood. Here, we show that plant late endocytic trafficking is diverted towards the extrahaustorial membrane; a host-pathogen interface that develops in plant cells invaded by Irish potato famine pathogen Phytophthora infestans. A late endosome and tonoplast marker protein Rab7 GTPase RabG3c, but not a tonoplast-localized sucrose transporter, is recruited to the extrahaustorial membrane suggesting specific rerouting of vacuole targeted late endosomes to a host pathogen interface. We revealed the dynamic nature of this process by showing that, upon activation, a cell surface immune receptor traffics towards the haustorial interface. Our work provides insight into the biogenesis of the extrahaustorial membrane and reveals dynamic processes that recruit membrane compartments and immune receptors to this host-pathogen interface.


Via Kamoun Lab @ TSL
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Curr Opin Plant Biol: Cross-interference of plant development and plant–microbe interactions (2014)

Curr Opin Plant Biol: Cross-interference of plant development and plant–microbe interactions (2014) | Plant-Microbe Interaction | Scoop.it

Plant roots are host to a multitude of filamentous microorganisms. Among these, arbuscular mycorrhizal fungi provide benefits to plants, while pathogens trigger diseases resulting in significant crop yield losses. It is therefore imperative to study processes which allow plants to discriminate detrimental and beneficial interactions in order to protect crops from diseases while retaining the ability for sustainable bio-fertilisation strategies. Accumulating evidence suggests that some symbiosis processes also affect plant–pathogen interactions. A large part of this overlap likely constitutes plant developmental processes. Moreover, microbes utilise effector proteins to interfere with plant development. Here we list relevant recent findings on how plant–microbe interactions intersect with plant development and highlight future research leads.


Via Kamoun Lab @ TSL
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Steve Marek's curator insight, June 16, 2014 2:56 PM

Nice review

Rakesh Yashroy's curator insight, July 2, 2014 10:54 AM

Microbe-macrobe or host-pathogen interface determines the cell-cell interactions largely @ http://en.wikipedia.org/wiki/Host-pathogen_interface