文献类型： 外文期刊

作者： Chen, Sheng ¹ ; Wan, Zhenjie ³ ; Nelson, Matthew N. ¹ ; Chauhan, Jitendra S. ⁴ ; Redden, Robert ⁵ ; Burton, Wayne A ¹ ;

作者机构： 1.Univ Western Australia, Sch Plant Biol M084, Crawley, WA 6009, Australia

2.Univ Western Australia, UWA Inst Agr, Crawley, WA 6009, Australia

3.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China

4.Directorate Rapeseed Mustard Res, Bharatpur 321303, Rajasthan, India

5.Dept Primary Ind, Horsham, Vic 3401, Australia

6.Xinjiang Acad Agr Sci, Econ Crop Res Inst, Urumqi 830000, Peoples R China

7.Univ Melbourne, Fac Land & Food Resources, Parkville, Vic 3010, Australia

关键词： allelic diversity;crop evolution;Indian mustard;migration route;oriental mustard

期刊名称：JOURNAL OF HEREDITY （ 影响因子：2.645； 五年影响因子：3.069 ）

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收录情况： SCI

摘要： The oilseed Brassica juncea is an important crop with a long history of cultivation in India and China. Previous studies have suggested a polyphyletic origin of B. juncea and more than one migration from the primary to secondary centers of diversity. We investigated molecular genetic diversity based on 99 simple sequence repeat markers in 119 oilseed B. juncea varieties from China, India, Europe, and Australia to test whether molecular differentiation follows Vavilov's proposal of secondary centers of diversity in India and China. Two distinct groups were identified by markers in the A genome, and the same two groups were confirmed by markers in the B genome. Group 1 included accessions from central and western India, in addition to those from eastern China. Group 2 included accessions from central and western China, as well as those from northern and eastern India. European and Australian accessions were found only in Group 2. Chinese accessions had higher allelic diversity per accession (Group 1) and more private alleles per accession (Groups 1 and 2) than those from India. The marker data and geographic distribution of Groups 1 and 2 were consistent with two independent migrations of B. juncea from its center of origin in the Middle East and neighboring regions along trade routes to western China and northern India, followed by regional adaptation. Group 1 migrated further south and west in India, and further east in China, than Group 2. Group 2 showed diverse agroecological adaptation, with yellow-seeded spring-sown types in central and western China and brown-seeded autumn-sown types in India.