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   2018, Vol.17 No.12 

   Published 2018-12-01

It is important to identify resistance genetic sources for identification of the genes underlying resistance to the devastating pathogen, soybean cyst nematode (SCN, Heterodera glycines Ichinohe), on soybean (Glycine max (L.) Merr.), for management of this pathogen. In this study, two ethane methylsulfonate (EMS)- mutagenesis populations of soybean PI 437654 and Zhonghuang 13 were developed, from which many types of morphological phenotypes were observed. Thirteen mutants were identified to display alteration of resistance to SCN race 4 through forward genetic screening of 400 PI 437654 mutants. These identified mutants did not show any changes in the genomic sequences of the three known SCN-resistant genes and were still resistant to SCN race 3 similar to the wild-type soybean. Thus, the thirteen identified mutants carry the mutations of the new gene(s) contributing to the resistance to SCN race 4 in PI 437654 and can be potentially used as the genetic soybean sources to further identify the novel SCN-resistant gene(s). Photos showed here were the two representative morphological phenotypes (short but high yield (right on top panel) and coat color change (left on bottom panel)), SCN infection (left on top panel) and cysts on soybean roots (right on bottom panel) of EMS-mutagenized soybean mutants. The photos were provided by Liu Shiming, Zhang Liuping, Ge Fengyong and Peng Deliang, the Institute of Plant Protection, Chinese Academy of Agricultural Science. See pages 2734–2744 by Ge et al. in details.
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