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Mauch-Mani, Brigitte
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Mauch-Mani, Brigitte
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Voici les éléments 1 - 10 sur 12
- PublicationAccès librePriming for enhanced defence responses by specific inhibition of the Arabidopsis response to coronatine(2011)
; Zimmerli, LaurentThe priming agent β-aminobutyric acid (BABA) is known to enhance Arabidopsis resistance to the bacterial pathogen Pseudomonas syringae pv. tomato (Pst) DC3000 by potentiating salicylic acid (SA) defence signalling, notably PR1 expression. The molecular mechanisms underlying this phenomenon remain unknown. A genome-wide microarray analysis of BABA priming during Pst DC3000 infection revealed direct and primed up-regulation of genes that are responsive to SA, the SA analogue benzothiadiazole and pathogens. In addition, BABA was found to inhibit the Arabidopsis response to the bacterial effector coronatine (COR). COR is known to promote bacterial virulence by inducing the jasmonic acid (JA) response to antagonize SA signalling activation. BABA specifically repressed the JA response induced by COR without affecting other plant JA responses. This repression was largely SA-independent, suggesting that it is not caused by negative cross-talk between SA and JA signalling cascades. Treatment with relatively high concentrations of purified COR counteracted BABA inhibition. Under these conditions, BABA failed to protect Arabidopsis against Pst DC3000. BABA did not induce priming and resistance in plants inoculated with a COR-deficient strain of Pst DC3000 or in the COR-insensitive mutant coi1-16. In addition, BABA blocked the COR-dependent re-opening of stomata during Pst DC3000 infection. Our data suggest that BABA primes for enhanced resistance to Pst DC3000 by interfering with the bacterial suppression of Arabidopsis SA-dependent defences. This study also suggests the existence of a signalling node that distinguishes COR from other JA responses. - PublicationMétadonnées seulementThe xenobiotic beta-aminobutyric acid enhances Arabidopsis thermotolerance(2008)
; Somerville, Shauna - PublicationAccès libreThe xenobiotic β-aminobutyric acid enhances Arabidopsis thermotolerance(2007)
; Somerville, ShaunaThe non-protein amino acid β-aminobutyric acid (BABA) primes Arabidopsis to respond more quickly and strongly to pathogen and osmotic stress. Here, we report that BABA also significantly enhances acquired thermotolerance in Arabidopsis. This thermotolerance was dependent on heat shock protein 101, a critical component of the normal heat-shock response. BABA did not enhance basal thermotolerance under a severe heat-shock treatment. No roles for the hormones ethylene and salicylic acid in BABA-induced acquired thermotolerance were identified by mutant analysis. Using global gene expression analysis, transcript levels for several transcription factors and DNA binding proteins regulating responses to the stress hormone abscisic acid (ABA) were found to be elevated in BABA-treated plants compared with water-treated plants. The role of ABA in BABA-induced thermotolerance was complex. BABA-enhanced thermotolerance was partially compromised in the ABA-insensitive mutant, abi1-1, but was augmented in abi2-1. In an unrelated process, BABA, like ABA, inhibited root growth, and the level of inhibition was roughly additive in roots treated with both compounds. Root growth of both abi1-1 and abi2-1 was also inhibited by BABA. Unexpectedly, abi1-1 and abi2-1 root growth was inhibited more strongly by combined ABA and BABA treatments than by BABA alone. Our results, together with previously published data, suggest that BABA is a general enhancer of plant stress resistance, and that cross-talk occurs between BABA and ABA signalling cascades. Specifically, the BABA-mediated accumulation of ABA transcription factors without concomitant activation of a downstream ABA response could represent one component of the BABA-primed state in Arabidopsis. - PublicationAccès librePriming: Getting Ready for Battle(2006)
; - PublicationMétadonnées seulementEnhancing Arabidopsis salt and drought stress tolerance by chemical priming for its abscisic acid responses(2005)
; - PublicationAccès libreEnhancing Arabidopsis Salt and Drought Stress Tolerance by Chemical Priming for Its Abscisic Acid Responses(2005)
; - PublicationMétadonnées seulementMolecular characterization of a novel lipase-like pathogen-inducible gene family of Arabidopsis(2003)
- PublicationAccès libreMolecular Characterization of a Novel Lipase-Like Pathogen-Inducible Gene Family of Arabidopsis(2003)
- PublicationMétadonnées seulementB-aminobutyric acid-induced resistance in plants(2001)
- PublicationMétadonnées seulementBeta-Aminobutyric acid-induced protection of Arabidopsis against the necrotrophic fungus Botrytis cinerea(2001)