Piffanelli Pietro, Zhou Fasong, Casais Catarina, Orme James, Jarosch Birgit, Schaffrath Ulrich, Collins Nicholas C., Panstruga Ralph, Schulze-Lefert Paul. 2002. The barley MLO modulator of defense and cell death is responsive to biotic and abiotic stress stimuli. Plant Physiology, 129 : 1076-1085.
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Résumé : Lack of the barley (Hordeum vulgare) seven-transmembrane domain MLO protein confers resistance against the fungal pathogen Blumeria graminis f. sp. hordei (Bgh). To broaden the basis for MLO structure/ function studies, we sequenced additional mlo resistance alleles, two of which confer only partial resistance. Wild-type MLO dampens the cell wall-restricted hydrogen peroxide burst at points of attempted fungal penetration of the epidermal cell wall, and in subtending mesophyll cells, it suppresses a second oxidative burst and cell death. Although the Bgh-induced cell death in mlo plants is spatially and temporally separated from resistance, we show that the two processes are linked. Uninoculated mutant mlo plants exhibit spontaneous mesophyll cell death that appears to be part of accelerated leaf senescence. Mlo transcript abundance increases in response to Bgh, rice (Oryza sativa) blast, wounding, paraquat treatment, a wheat powdery mildew-derived carbohydrate elicitor, and during leaf senescence. This suggests a broad involvement of Mlo in cell death protection and in responses to biotic and abiotic stresses.
Mots-clés Agrovoc : protéine microbienne, phytoplasme, Hordeum vulgare, résistance aux maladies, stress, stimulus
Classification Agris : F60 - Physiologie et biochimie végétale
H20 - Maladies des plantes
Auteurs et affiliations
- Piffanelli Pietro, CIRAD-AMIS-BIOTROP (FRA)
- Zhou Fasong, John Innes Centre (GBR)
- Casais Catarina, John Innes Centre (GBR)
- Orme James, John Innes Centre (GBR)
- Jarosch Birgit, RWTHA (DEU)
- Schaffrath Ulrich, RWTHA (DEU)
- Collins Nicholas C., John Innes Centre (GBR)
- Panstruga Ralph, MPIZ (DEU)
- Schulze-Lefert Paul, MPIZ (DEU)
Autres liens de la publication
Source : Cirad - Agritrop (https://agritrop.cirad.fr/510131/)
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