Strategies of attack and defense in plant–oomycete interactions, accentuated for Phytophthora parasitica Dastur (syn. P. Nicotianae Breda de Haan)

Attard, Agnès; Gourgues, Mathieu; Galiana, Eric; Panabières, Franck; Ponchet, Michel; Keller, Harald

doi:10.1016/j.jplph.2007.06.011

Cited by 46 publications

(30 citation statements)

References 93 publications

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“…The EZ is generally considered to be a major site for the exudation of secondary metabolites (McDougall and Rovira, 1970), which may act as chemoattractants and carbon sources as well as antimicrobials for various microbes, including a number of root pathogens, such as the oomycetes Phytophtora and Pythium and the pathogenic bacteria R. solanacearum, all of which preferentially accumulate and initiate infection at the EZ (Raftoyannis and Dick, 2006;Attard et al, 2008). In addition, the EZ is particularly susceptible to infections due to the remodeling of cell walls and the absence of secondary cell walls in elongating cells.…”

Section: Localization Of Mamp Responses In Rootsmentioning

confidence: 99%

Innate Immune Responses Activated in Arabidopsis Roots by Microbe-Associated Molecular Patterns

et al. 2010

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Despite the fact that roots are the organs most subject to microbial interactions, very little is known about the response of roots to microbe-associated molecular patterns (MAMPs). By monitoring transcriptional activation of b-glucuronidase reporters and MAMP-elicited callose deposition, we show that three MAMPs, the flagellar peptide Flg22, peptidoglycan, and chitin, trigger a strong tissue-specific response in Arabidopsis thaliana roots, either at the elongation zone for Flg22 and peptidoglycan or in the mature parts of the roots for chitin. Ethylene signaling, the 4-methoxy-indole-3-ylmethylglucosinolate biosynthetic pathway, and the PEN2 myrosinase, but not salicylic acid or jasmonic acid signaling, play major roles in this MAMP response. We also show that Flg22 induces the cytochrome P450 CYP71A12-dependent exudation of the phytoalexin camalexin by Arabidopsis roots. The phytotoxin coronatine, an Ile-jasmonic acid mimic produced by Pseudomonas syringae pathovars, suppresses MAMP-activated responses in the roots. This suppression requires the E3 ubiquitin ligase COI1 as well as the transcription factor JIN1/MYC2 but does not rely on salicylic acid-jasmonic acid antagonism. These experiments demonstrate the presence of highly orchestrated and tissue-specific MAMP responses in roots and potential pathogen-encoded mechanisms to block these MAMP-elicited signaling pathways.

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Section: Localization Of Mamp Responses In Rootsmentioning

confidence: 99%

Innate Immune Responses Activated in Arabidopsis Roots by Microbe-Associated Molecular Patterns

et al. 2010

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“…Alternatively, in resistant plants, effectors are recognized by the products of plant resistance genes, resulting in host cell death and effective defense response known as the hypersensitive response (HR) restricting the pathogen to an area of scorched earth [7,9]. Phytophthora effectors that suppress host defense responses have been described in several pathosystems [10][11][12]. Suppression of host defenses can occur through the production of inhibitor proteins that target host enzymes [13].…”

Section: Introductionmentioning

confidence: 99%

Cloning, characterization and in vitro and in planta expression of a glucanase inhibitor protein (GIP) of Phytophthora cinnamomi

Martins

Belo

et al. 2014

Mol Biol Rep

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Oomycetes from the genus Phytophthora are fungus-like plant pathogens that are devastating for agriculture and natural ecosystems. They are able to secrete a glucanase inhibitor protein (GIP) that inhibits the activity of endoglucanases (EGases) involved in defense responses against infection. One of the most widely distributed and aggressive Phytophthora species, with more than 1,000 host plants is P. cinnamomi. In this work we report the sequencing and characterization of a class of GIPs secreted by Phytophthora cinnamomi. The gip gene from P. cinnamomi has a 937 bp ORF encoding a putative peptide of 312 deduced amino acids. The expression of this gene was studied during growth in different carbon sources (glucose, cellulose and sawdust), by RT-qPCR and its level of expression was evaluated at five time points. The highest expression of gip gene occurred in sawdust at 8 h of induction. In vivo infection of C. sativa revealed an increase in gip expression from 12 to 24 h. At 36 h its expression decreased suggesting that a compensatory mechanism must occur in plant.

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“…The significance of the decrease in exoproteinase activity during the interaction of avocado with the oomycete is unknown until now, and additional work is needed to this respect, however, because the infection strategies used by oomycetes to attack and colonize plants involve the production of germ tubes to enter directly into the intercellular spaces through wound openings on leaves, or form swellings that allow penetration between epidermal cells on root surfaces [24], high levels of extracellular proteinases, specifically during the avocado infection, could be not necessary.…”

Section: Discussionmentioning

confidence: 99%

Interaction of Extracellular Proteinases of Phytophthora cinnamomi with Proteinase Inhibitors Produced by Avocado Root

López¹,

Mercado²,

Sánchez³

2011

J Plant Pathol Microbiol

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Strategies of attack and defense in plant–oomycete interactions, accentuated for Phytophthora parasitica Dastur (syn. P. Nicotianae Breda de Haan)

Cited by 46 publications

References 93 publications

Innate Immune Responses Activated in Arabidopsis Roots by Microbe-Associated Molecular Patterns

Innate Immune Responses Activated in Arabidopsis Roots by Microbe-Associated Molecular Patterns

Cloning, characterization and in vitro and in planta expression of a glucanase inhibitor protein (GIP) of Phytophthora cinnamomi

Interaction of Extracellular Proteinases of Phytophthora cinnamomi with Proteinase Inhibitors Produced by Avocado Root

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