Plant and Cell Physiology Supplement
Abstract of the Annual Meeting of JSPP 2010
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Analysis of anc1, Arabidopsis Mutant with Altered Hypersensitive Response
*Aya NakatsujiNoriyuki HatsugaiShinji IwasakiIkuko Hara-Nishimura
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Pages 0177

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Abstract
While bacteria secrete avirulence gene products called effectors, plants use resistance-gene products to recognize those effectors with strict specificity. After their recognition, plants induce a variety of defense pathways so-called "gene-for-gene" resistance. In this study, an EMS-mutagenized line of Arabidopsis thaliana expressing dexamethasone (DEX)-inducible avrRpt2, an effector of Pseudomonas syringae pv. tomato (Pst. ), was employed for searching a novel mutant with altered hypersensitive response (HR).
Under DEX treatment, one line out of approximately 1,000 mutated seeds showed no HR-induced cell death with moderate susceptibility to virulent bacteria Pst. DC3000. HR-induced cell death could not be detected in this mutant when it was inoculated with avirulent Pst. DC3000 expressing either avrRpm1 or avrRpt2; however, it was highly susceptible only to avrRpm1, but not to avrRpt2. This mutant was named asavrRpt2 specific resistance with no cell death 1 (anc1). To date, such phenotype, HR-alternation with extremely high susceptibility to a specific effector, has not been reported, and it may give new insight into the plant defense system.
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© 2010 by The Japanese Society of Plant Physiologists
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