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Genetic Variation in Triticum turgidum L. ssp. turgidum Landraces from China Assessed by EST-SSR Markers

Genetic Variation in Triticum turgidum L. ssp. turgidum Landraces from China Assessed by EST-SSR Markers

作     者:LI Wei DONG Pan WEI Yu-ming CHENG Guo-yue ZHENG You-liang 

作者机构:Key Laboratory of Crop Genetic Resources and Improvement in Southwest China Ministry of Education/Sichuan Agricultural University Ya'an 625014 P.R.China Triticeae Research Institute Sichuan Agricultural University Dujiangyan 611830 P.R.China College of Agronomy Sichuan Agricultural University Ya'an 625014 P.R.China 

出 版 物:《Agricultural Sciences in China》 (中国农业科学(英文版))

年 卷 期:2008年第7卷第9期

页      面:1029-1036页

学科分类:09[农学] 0901[农学-作物学] 

基  金:the National High Technology Research and Development Program of China (863 Program,2006AA10Z179 and 2006AA10Z1F8) the National Excellent Doctoral Dissertation of China (200357 and 200458) the Key Technologies R&D Program of China (2006BAD01A02-23 and 2006BAD13B02) 

主  题:T. turgidum L. ssp. turgidum EST-SSR markers genetic variation genetic structure 

摘      要:It was helpful for the wheat improvement to evaluate the genetic resources of Triticum turgidum L. ssp. turgidum landraces. In this study, 68 turgidum landraces accessions, belonging to four geographic populations in China, were investigated by using EST-SSR markers. A total of 63 alleles were detected on 22 EST-SSR loci, and the number of alleles on each locus ranged from 1 to 5, with an average of 2.9. The results of the analysis of molecular variance (AMOVA) indicated that 92.5% of the total variations was attributed to the genetic variations within population, whereas only 7.5% variations among populations. Although the four populations had similar genetic diversity parameters, Sichuan population was yet distinguished from other populations when comparing the population samples in pairs. Significant correlations were detected by the statistic analysis among six genetic diversity parameters among each other. The selection difference between heterozygosty and homozygosty was also observed among different EST-SSR locus. The genetic similarity (GS) ranged from 0.18 to 0.98, with the mean of 0.72, and all accessions could be clustered into 7 groups. The dendrogram suggested that the genetic relationships among turgidum accessions evaluated by EST-SSR markers were unrelated to their geographic distributions. These results implied that turgidum landraces from China had the unique characters of genetic diversity.

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