Genetic diversity among populations and breeding lines from recurrent selection in Brassica napus as revealed by RAPD markers
文献类型： 外文期刊
作者： Yuan, M 1 ; Zhou, Y 2 ; Liu, D 2 ;
作者机构： 1.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China
2.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China; Hubei Acad Agr Sci, Wuhan 430072, Peoples R China
关键词： Brassica napus;dominant male sterility;genetic diversity;random amplified polymorphic DNA;recurrent selection
期刊名称：PLANT BREEDING （ 影响因子：1.832； 五年影响因子：1.956 ）
ISSN： 0179-9541
年卷期： 2004 年 123 卷 1 期
页码：
收录情况： SCI
摘要： Recurrent selection facilitated by dominant male sterility has been conducted to broaden the genetic basis for cultivar development in Brassica napus. This study aimed to evaluate the genetic variation in four base populations (C0-C3) and breeding lines from two of the populations produced during recurrent selection by random amplified polymorphic DNA (RAPD) markers. Genetic variation in four populations declined gradually with the advance of selection cycles as measured by expected genetic heterozygosity (from 0.2058 in C0 to 0.1536 in C3) but the decline was not statistically significant. When compared with the average genetic distances for 21 germplasm collections with wide geographical and genetic origins (0.4712) and seven breeding lines from pedigree selection (0.2059), seven breeding lines selected from the C1 population and 11 from the C3 population had a larger average genetic distance (0.5339 and 0.5486, respectively). Clustering analysis indicated that the lines from recurrent selection had a much lower genetic similarity than lines from pedigree selection. Our results suggest that base populations derived from recurrent selection could provide a wider genetic variation for selection of breeding lines with more broad genetic bases.
- 相关文献
