Phylogenetic relationships, interspecific hybridization and origin of some rare characters of wild soybean in the subgenus Glycine soja in China

文献类型： 外文期刊

第一作者： Wang, Ke-Jing

作者： Wang, Ke-Jing;Li, Xiang-Hua

作者机构：

关键词： Evolution;Glycine soja;Phylogenesis;Semi-wild soybean;Wild soybean

期刊名称：GENETIC RESOURCES AND CROP EVOLUTION （ 影响因子：1.524； 五年影响因子：1.713 ）

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年卷期：

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收录情况： SCI

摘要： The Glycine subgenus Soja includes two species, cultivated soybean [(Glycine max (L.) Merr.)] and the progenitor wild soybean (G. soja). However, a morphologically intermediate form, the semi-wild soybean (G. gracilis), exists between the two species, and its taxonomic position is under debate. In this study, we evaluated phylogenetic relationships and occurrence events within the subgenus Soja based on genetic variation of SSR loci using a set of accessions comprising wild soybeans (<=3.0 g 100-seed weight), semi-wild soybeans (>3.0 g) and soybean landraces (>=4.0 g). The results showed that semi-wild soybean accessions collected in natural fields should be treated as a variant of G. soja and not of G. max, and were genetically differentiated from the soybean landraces, even large-seeded semi-wild soybean accessions (6.01-9.0 g) with seed weights overlapping with or exceeding those of soybean landraces. Evolutionary bottleneck analysis indicated that semi-wild soybean is not a transitional form in the domestication of cultivated soybeans from wild soybean. G. soja contained two genetically differentiated forms, small-seeded type (typical, plus 2.01-2.50 g) and a large-seeded type (2.51-3.0 g). Genetically, the large-seeded wild soybean was closer to the semi-wild soybean, although in morphology it resembled the typical wild soybean. Ancestry analysis confirmed that cultivated soybean genes have introgressed into modern wild soybean populations. The green cotyledon character and other rare characters such as white flower, grey pubescence, no-seed bloom, and coloured seed-coats (brown, green, and yellow) in wild soybean were shown to be involved in introgression from cultivated soybeans.Digital Object Identifier http://dx.doi.org/10.1007/s10722-011-9790-6

分类号： S18

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