Abstract
Yam (Dioscorea spp.) is widely cultivated in China and many landraces are maintained by local farmers. However, there is little information available about their diversity and species identity. In this study, inter simple sequence repeat (ISSR) and sequence related amplified polymorphism (SRAP) techniques were used to assess genetic diversity within 21 yam landraces from seven cultivated populations. We observed high level of polymorphism among these landraces, specifically, 95.3 % for ISSR and 93.5 % for SRAP. Analysis of molecular variance revealed a significantly greater variation among the four yam species (40.39 %) and their populations (35.78 %) than within the populations (23.83 %). The unweighted pair group method arithmetic averages clusters and principal component analysis for 21 landraces formed four well-separated groups containing landraces of each of the four species, namely, Dioscorea opposita Thunb., Dioscorea alata L., Dioscorea persimilis Prain et Burkill, and Dioscorea fordii Prain et Burkill. The ISSR and SRAP primers were highly discriminatory among the 21 landraces; all 21 landraces could be easily differentiated using these primers. The average mean of gene flow (Nm = 0.1081) estimated from high genetic differentiation (Gst = 0.8222) suggested that gene flow among the populations was relatively restricted. The lack of genetic diversity within individual yam species suggests that it is critical to develop long-term strategies for enhancing genetic diversity within various yam species.
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Acknowledgments
The present study was supported by the Agricultural Science and Technology Program of Wenzhou in China (Grant No. N20100003), Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants (Grant No. 2011E10015). We are grateful to RuiAn Agriculture and Foresty Bureau (Ruian city, Zhejiang Province), Sanming Agricultural Science Institute (Sanming city, Fujian Province), Wenxian Agricultural Science Institute (Wenxian City, Henan Province), for positive help with sampling yam landraces. Many thanks to Pro. Xin-Chun Lin and Xiao-Xia Li, for their help with PCR experiments.
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Wu, Z.G., Li, X.X., Lin, X.C. et al. Genetic diversity analysis of yams (Dioscorea spp.) cultivated in China using ISSR and SRAP markers. Genet Resour Crop Evol 61, 639–650 (2014). https://doi.org/10.1007/s10722-013-0065-2
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DOI: https://doi.org/10.1007/s10722-013-0065-2