【摘 要】
:
Bacterial wilt caused by Ralstonia solanacearum is a serious disease of peanut (Arachis hypogaea L.) in China.The mechanism and the molecular basis of resistance to R.solanacearum are poorly understoo
【机 构】
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Oil Crop Research Institute,Chinese Academy of Agricultural Sciences /Key Laboratory of Biology and
【出 处】
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中国作物学会油料作物专业委员会第七次会员代表大会暨学术年会
论文部分内容阅读
Bacterial wilt caused by Ralstonia solanacearum is a serious disease of peanut (Arachis hypogaea L.) in China.The mechanism and the molecular basis of resistance to R.solanacearum are poorly understood.Arachis duranensis, a wild diploid species of the genus Arachis has been proved to carry resistance genes and protect peanut from R.solanacearum, and thus holds great potentials for the genetic improvement of peanut and in understanding of bacterial wilt resistance.In this study, suppression subtractive hybridization (SSH) and macroarray hybridization were employed to detect differentially expressed genes (DEGs) in the roots of A.duranensis inoculated with R.solanacearum.A total of 319 unique genes were obtained, 267 of them had homologous sequences and function annotations.KEGG analyses revealed that these unigenes were mainly involved in plant secondary metabolism, especially showed a great enrichment in the metabolism of terpenoid including the biosynthesis of sesquiterpenoid, triterpenoid and indole alkaloid.The real-time PCR suggested that the terpenoid phytoalexin synthesis-related genes showed higher expression levels in resistant genotype of A.duranensis, and the terpenoid phytoalexin probably played a fundamental role in wild Arachis resistance to R.solanacearum.This study provides an overview of gene expression in the root of wild Arachis species in response to R.solanacearum infection, and the candidate genes are also valuable for the further study of the molecular mechanisms of resistance to R.solanacearum.
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