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《China Biotechnology》 2015-11
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Advances in Genetic Research Related to the Synthesis of Alternaria alternata Toxins

WANG Hong-xiu;ZHANG Qian;WANG Ling-jie;TANG Ke-zhi;Southwest University/Citrus Research Institute,Chinese Academy of Agricultural Sciences;  
Alternaria Nees which can produce at least 9 HST,are one of the most cosmopolitan fungus.According to different hosts,seven of Alternaria Nees are considered distinct pathotypes of Alternaria alternata.Each pathotype produces specific HST,a diverse group of low-molecular-weight secondary metabolites,which is toxic to susceptible cultivars,but not to resistant cultivars.The genes participating in HST biosynthesis are multicope genes which constitute gene clusters.These gene clusters are located on a 2.0Mb CD chromosome which determines the pathogenicity of the A.alternate.The inherent instability of the chromosomes does not affect hypha growth or conidium germination,but does affect the disease-causing capacity on host plants.The HST biosynthetic genes have been isolated from six pathotypes of A.alternate.HST produced by the Japanese pear,strawberry and tangerine pathotype have a common structural moiety,EDA,and these three pathotypes share common genes required for EDA biosynthesis.Studies of the molecular genetics of HST production have provided new insights into the evolution of A.alternata pathotypes.
【Fund】: 教育部创新团队(IRT0976);; 重庆市科技攻关(CSTC2012GG-YYJSX0001)资助项目
【CateGory Index】: Q78;S432.44
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