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Suppression of edr2-mediated powdery mildew resistance, cell death and ethylene-induced senescence by mutations in ALD1 in Arabidopsis 被引量:4
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作者 Haozhen Nie Yingying Wu +1 位作者 Chunpeng Yao Dingzhong Tang 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2011年第4期137-148,共12页
EDR2 is a negative regulator of the defense response and cell death in Arabidopsis.Loss-of-function of EDR2 leads to enhanced resistance to powdery mildew.To identify new components in the EDR2 signal transduction pat... EDR2 is a negative regulator of the defense response and cell death in Arabidopsis.Loss-of-function of EDR2 leads to enhanced resistance to powdery mildew.To identify new components in the EDR2 signal transduction pathway,mutations that suppress edr2 resistant phenotypes were screened.Three mutants,edts5-1,edts5-2 and edts5-3(edr two suppressor 5),were identified.The EDTS5 gene was identified by map-based cloning and previously was shown to encode an aminotransferase(ALD1).Therefore we renamed these three alleles ald1-10,ald1-11 and ald1-12,respectively.Mutations in ALD1 suppressed all edr2-mediated phenotypes,including powdery mildew resistance,programmed cell death and ethylene-induced senescence.Accumulation of hydrogen peroxide in edr2 was also suppressed by ald1 mutation.The expression of defense-related genes was up-regulated in the edr2 mutant,and the up-regulation of those genes in edr2 was suppressed in the edr2/ald1 double mutant.The ald1 single mutant displayed delayed ethylene-induced senescence.In addition,ald1 mutation suppressed edr1-mediated powdery mildew resistance,but could not suppress the edr11edr2 double-mutant phenotype.These data demonstrate that ALD1 plays important roles in edr2-mediated defense responses and senescence,and revealed a crosstalk between ethylene and salicylic acid signaling mediated by ALD1 and EDR2. 展开更多
关键词 ALD1 ambidopsis Defense signaling EDR2 Powdery mildew Salicylic acid
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