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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (12): 2286-2296.doi: 10.3724/SP.J.1006.2012.02286

• RESEARCH NOTES • Previous Articles     Next Articles

Genetic Diversity and Population Structure of Germplasm Resources in Sesame (Sesamum indicum L.) by SSR Markers

YUE Wen-Di1,WEI Li-Bin2,ZHANG Ti-De2,LI Chun2,MIAO Hong-Mei2,ZHANG Hai-Yang2,*   

  1. 1 National Key Laboratory of Crop Genetics and Germplasm Enhancement / Nanjing Agricultural University, Nanjing 210095, China; 2 Henan Sesame Research Center, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China
  • Received:2012-04-24 Revised:2012-09-05 Online:2012-12-12 Published:2012-10-08
  • Contact: 张海洋, E-mail: zhy@hnagri.org.cn, Tel: 0371-65715936


A total of 545 sesame accessions, including domestic and foreign germplasm resources, were analyzed systematically with 42 SSR primer pairs. The results showed that 106 allele bands were detected among the sesame accessions, and the Shannon’s information index (I) was 0.4092. Analysis results of UPGMA clustering, two-dimension principal components and population structure were basically consistent; 545 varieties were divided into three groups in UPGMA dentrogram or three subgroups in population structure. There were the lower genetic differentiation coefficient and the closer sibship in worldwide sesame. The similarity coefficient of seven ecological groups in China ranged from 0.9811 to 0.5462, and there was no close genetic relationship between varieties from northern regions and other regions in China. The similarity coefficients for foreign varieties were from 0.9726 to 0.7442, and the genetic relationships of varieties from Africa zone was close to those from Japan zone, but not from China. It showed that the genetic basis of varieties from China was relatively narrow, and the genetic diversities of varieties were not completely related to geopraphic distribution, but the genetic diversities of varieties from abroad presented abundance. Therefore, the introduction of foreign resources should be reinforced, and the domestic resources from different regions should be utilized in the future sesame breeding.

Key words: Sesamum indicum.L, Germplasm resource, SSR marker, Genetic diversity, Population structure

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