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GrainGenes Reference Report: PPS-129-1076

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Reference	PPS-129-1076
Title	The barley MLO modulator of defense and cell death is responsive to biotic and abiotic stress stimuli
Journal	Plant Physiology
Year	2002
Volume	129
Pages	1076-1085
Author	Piffanelli P [ Show all 9 ]
Abstract	Summary: 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
Keyword	[ Hide all but 1 of 54 ] abiotic stress abiotic stresses arabidopsis mutant barley blast blumeria blumeria graminis carbohydrate cell cell death cell wall cell-death confers resistance death defense disease resistance domain elicitor fungal fungal pathogen fungus magnaporthe-grisea graminis graminis f-sp hordei hordeum hydrogen involvement leaf senescence mesophyll mesophyll cells mlo mlo resistance mutant oryza oxidative burst paraquat partial resistance pathogen penetration powdery mildew fungus protection protein resistance responses rice senescence stress stresses subcellular-localization transcript transcript abundance wall wild-type wounding

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