Mining EST-Derived SSR Markers to Assess Genetic Diversity in Cassava (Manihot esculenta Crantz)
文献类型: 外文期刊
作者: Zou, Meiling 1 ; Xia, Zhiqiang 1 ; Ling, Peng 2 ; Zhang, Yang 1 ; Chen, Xin 1 ; Wei, Zusheng 3 ; Bo, Weiping 1 ; Wang, We 1 ;
作者机构: 1.CATAS, ITBB, Haikou 571101, Peoples R China
2.Univ Florida, CREC, Gainesville, FL USA
3.CATAS, TCGRI, Danzhou 571737, Peoples R China
4.Hainan Univ, Haikou 571101, Peoples R China
关键词: alleles;microsatellites;expressed sequence tag: EST;simple sequence repeats: SSRs;genetic diversity;NCBI sequence database
期刊名称:PLANT MOLECULAR BIOLOGY REPORTER ( 影响因子:1.595; 五年影响因子:2.042 )
ISSN:
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收录情况: SCI
摘要: Cassava (Manihot esculenta Crantz) is a very important staple and industrial crop in tropical and subtropical regions of the world. The paucity of markers is a serious limitation in marker-assisted breeding. A total of 35,992 expressed sequence tags (ESTs) from cassava, which were clustered in 13,173 unigenes, were used in this study. A total of 1,889 microsatellites were identified, with an average density of one simple sequence repeats (SSRs) every 4.40 kb. Of the 1,058 designed EST-SSRs from cultivars SC06, TMS60444, and W14, 431 were polymorphic. Then, 31 randomly selected EST-SSRs from the 431 polymorphic EST-SSRs were used to evaluate the genetic diversity of 76 cassava accessions. A total of 93 alleles were identified, and the number detected for each EST-SSR ranged from one to four. Based on the 93 alleles, the 76 cassava accessions could be classified into six groups, and the genetic similarity coefficient ranged from 0.55 to 0.94. This study demonstrated the potential of EST-derived SSRs in cassava. The resources developed in this study enriched the available molecular markers for cassava.
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