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Article: Ascorbic Acid Deficiency Activates Cell Death and Disease Resistance Responses in Arabidopsis1
- Article from:
- Plant Physiology
- Article date:
- November 1, 2005
- Author:
CopyrightCopyright American Society of Plant Physiologists Nov 2005. Provided by ProQuest LLC. (Hide copyright information)
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Programmed cell death, developmental senescence, and responses to pathogens are linked through complex genetic controls that are influenced by redox regulation. Here we show that the Arabidopsis (Arabidopsis thaliana) low vitamin C mutants, vtc1 and vtc2, which have between 10% and 25% of wild-type ascorbic acid, exhibit microlesions, express pathogenesis-related (PR) proteins, and have enhanced basal resistance against infections caused by Pseudomonas syringae. The mutants have a delayed senescence phenotype with smaller leaf cells than the wild type at maturity. The vtc leaves have more glutathione than the wild type, with higher ratios of reduced glutathione to glutathione disulfide. ...