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|Title:||The barley MLO modulator of defense and cell death Is responsive to biotic and abiotic stress stimuli|
|Citation:||Plant Physiology, 2002; 129(3):1076-1085|
|Publisher:||Amer Soc Plant Physiologists|
|Pietro Piffanelli, Fasong Zhou, Catarina Casais, James Orme, Birgit Jarosch, Ulrich Schaffrath, Nicholas C. Collins, Ralph Panstruga, and Paul Schulze-Lefert|
|Abstract:||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.|
|Keywords:||Cell Wall; Fungi; Hordeum; Plant Leaves; Hydrogen Peroxide; Paraquat; Plant Proteins; Apoptosis; Plant Diseases; Gene Expression Regulation, Developmental; Gene Expression Regulation, Plant; RNA Splicing; Mutation; Alleles; Stress, Mechanical; Immunity, Innate|
|Appears in Collections:||Australian Centre for Plant Functional Genomics publications|
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