Genetic Diversity of Agronomic Traits in Foreign Pea Germplasm Resources

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    Pea is the third largest legume crops globally, and the demand for peas is increasing in the developing world. In order to understand the genetic diversity of foreign pea genetic resources and improve the efficiency of pea breeding programs in China, nine agronomic traits of 271 foreign peas from 57 countries had been analyzed for genetic diversity by using cluster analysis and principal component analysis. The results demonstrated a high level of genetic diversity among these peas. The genetic diversity index of first fruiting nodes (2.0590) was highest, followed by nods number of the main stem (2.0421). The coefficient variation (CV) of seed weight per plot (64.874%) was highest, followed by 100-seed weight (61.870%). In recent study, the principal components of 7 quantitative traits were analyed, and the results showed that the accumulation indices of the top three principal components was up to 66.022%. Cluster analysis showed that 271 pea accessions were classified into 4 groups. The Group Ⅱ had traits of tall stalks, big seeds and high yield, providing useful resources for hybridization breeding. The resources from the 17 countries of 4 continents showed significant genetic diversity, the genetic diversity index of India was highest. Comprehensive analysis of agronomic traits provided scientific information for effective use of pea genetic resources in pea breeding programs of China.

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  • Received:March 10,2016
  • Revised:May 05,2016
  • Adopted:July 06,2016
  • Online: January 17,2017
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