Molecular and geographic evolutionary support for the essential role of GIGANTEAa in soybean domestication of flowering time
文献类型: 外文期刊
第一作者: Wang, Yan
作者: Wang, Yan;Gu, Yongzhe;Gao, Huihui;He, Chaoying;Gu, Yongzhe;Gao, Huihui;Qiu, Lijuan;Chang, Ruzhen;Chen, Shouyi
作者机构:
关键词: Domestication;Evolution;Flowering time;GIGANTEA;Haplotype;Soybean
期刊名称:BMC EVOLUTIONARY BIOLOGY ( 影响因子:3.26; 五年影响因子:3.732 )
ISSN: 1471-2148
年卷期: 2016 年 16 卷
页码:
收录情况: SCI
摘要: Background: Flowering time is a domestication trait of Glycine max and varies in soybeans, yet, a gene for flowering time variation has not been associated with soybean domestication. GIGANTEA (GI) is a major gene involved in the control of flowering time in Arabidopsis, although three GI homologs complicate this model in the soybean genome. Results: In the present work, we revealed that the geographic evolution of the GIGANTEAa (GIa) haplotypes in G. max (GmGIa) and Glycine soja (GsGIa). Three GIa haplotypes (H1, H2, and H3) were found among cultivated soybeans and their wild relatives, yet an additional 44 diverse haplotypes were observed in wild soybeans. H1 had a premature stop codon in the 10th exon, whereas the other haplotypes encoded full-length GIa protein isoforms. In both wild-type and cultivated soybeans, H2 was present in the Southern region of China, and H3 was restricted to areas near the Northeast region of China. H1 was genetically derived from H2, and it was dominant and widely distributed among cultivated soybeans, whereas in wild populations, the ortholog of this domesticated haplotype H1 was only found in Yellow River basin with a low frequency. Moreover, this mutated GIa haplotype significantly correlated with early flowering. We further determined that the differences in gene expression of the three GmGIa haplotypes were not correlated to flowering time variations in cultivated soybeans. However, only the truncated GmGIa H1 could partially rescue gi-2 Arabidopsis from delayed flowering in transgenic plants, whereas both GmGIa H2 and H3 haplotypes could significantly repress flowering in transgenic Arabidopsis with a wild-type background. Conclusions: Thus, GmGIa haplotype diversification may have contributed to flowering time adaptation that facilitated the radiation of domesticated soybeans. In light of the evolution of the GIa gene, soybean domestication history for an early flowering phenotype is discussed.
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