Development of simple sequence repeat markers and diversity analysis in alfalfa (Medicago sativa L.)
文献类型: 外文期刊
第一作者: Wang, Zan
作者: Wang, Zan;Yan, Hongwei;Fu, Xinnian;Gao, Hongwen;Li, Xuehui
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关键词: Alfalfa;EST–SSR markers;Genetic diversity
期刊名称:MOLECULAR BIOLOGY REPORTS ( 影响因子:2.316; 五年影响因子:2.357 )
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收录情况: SCI
摘要: Efficient and robust molecular markers are essential for molecular breeding in plant. Compared to dominant and bi-allelic markers, multiple alleles of simple sequence repeat (SSR) markers are particularly informative and superior in genetic linkage map and QTL mapping in autotetraploid species like alfalfa. The objective of this study was to enrich SSR markers directly from alfalfa expressed sequence tags (ESTs). A total of 12,371 alfalfa ESTs were retrieved from the National Center for BiotechnologyInformation. Total 774 SSR-containing ESTs were identified from 716 ESTs. On average, one SSR was found per 7.7 kb of EST sequences. Tri-nucleotide repeats (48.8 %) was the most abundant motif type, followed by di—(26.1 %), tetra—(11.5 %), penta—(9.7%), and hexanucleotide (3.9 %). One hundred EST–SSR primer pairs were successfully designed and 29 exhibited polymorphism among 28 alfalfa accessions. The allele number per marker ranged from two to 21 with an average of 6.8. The PIC values ranged from0.195 to 0.896 with an average of 0.608, indicating a high level of polymorphism of the EST–SSR markers. Based on the 29 EST–SSR markers, assessment of genetic diversity was conducted and found that Medicago sativa ssp. sativa was clearly different from the other subspecies. The high transferability of those EST–SSR markers was also found for relative species.
分类号: Q7
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