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Title:: Analysis on the Toxicity Variation and Virulence Structure of Soybean Phytophthora sojae in Heilongjiang Province

Author(s):: MA Shu-mei; HAN Xin-hua; (Agricultural Source and Environmental College,Heilongjiang University,Harbin 150080,China)

Keywords:: Soybean; Phytophthora sojae; Toxicity variation; virulence structure

Abstract:: A set of foreign standard soybean differentials was applied to systematically examine the virulence genes and structures of soybean Phytophthora sojae(SPS),which were isolated from soybean production regions in Heilongjiang province during 2009 to 2012.The results showed that all known virulence genes in the tested SPS strains from Heilongjiang province could overcome all known major resistance genes.Three hundred SPS strains tested were divided into 28 different virulence types.The virulence types of 1a，7；6，7；7；1a，1c，6，7；1a，3c，4，6，7；1a，1d，3c，5，7；1b，1k，4，6，7 were the predominant populations and the proportion of which were 17%,21%,9%,7%,4%,5% and 6%,respectively.Meanwhile the first three virulence types were distributed in the main soybean production regions of eastern,central and northern of Heilongjiang province.The formation of SPS virulence genes in the soybean production areas in Heilongjiang province was complex and in Harbin and Qiqihar the types of genes were up to 15 species.rps1k is an important resistance gene,there was virulent pathogens existed acting on the rps1k gene and the proportion was 10.3%,which illuminated that there were strong virulent strains of SPS in Heilongjiang soybean production areas.Thus it is urgent to discover new resistant genes and culture new resistant resources.