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《Journal of Huazhong Agricultural University》 2008-06
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Genetic Diversity of Pathogenic and Nonpathogenic Phytophthora capsici

SUN Wen-xiu1) ZHANG Xiu-guo2)(1)College of Life Science,Yangtze University,Jingzhou 434025,China;`2)Department of Plant Pathology,Shandong Agricultural University,Taian 271018,China)  
11 pathogenic isolates and 11 nonpathogenic isolates of Phytophthora capsici were obtained from peppers and soil.The genetic diversity of all 22 isolates was assessed by RAPD,sequence analysis of the rDNA internal transcribed spacers,and pathogenicity tests on pepper.RAPD analysis grouped the isolates into two clusters.The pathogenic isolates were in a group,where there were three nonpathogenic isolates.The result of ITS region analysis indicated that pathogenic and nonpathogenic isolates were also separated into two groups,but the population of pathogenic isolates was less diverse than that of the nonpathogenic isolates,suggesting that the pathogenic isolates were monophyletic origin.For both pathogenic and nonpathogenic P.capcisi,no relationship was observed between the genetic profiles and geographic origin: this may indicate that pathogens did not originate independently at each locality.
【Fund】: 山东省优秀中青年科学家基金(05BS02017)资助
【CateGory Index】: S436.418.1
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