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Differential expression of a WRKY gene between wild and cultivated soybeans correlates to seed size

文献类型： 外文期刊

作者： Gu, Yongzhe 1 ; Li, Wei 3 ; Jiang, Hongwei 4 ; Wang, Yan 1 ; Gao, Huihui 1 ; Liu, Miao 3 ; Chen, Qingshan 5 ; Lai, Yongca 1 ;

作者机构： 1.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Heilongjiang Acad Agr Sci, Crop Tillage & Cultivat Inst, Harbin 150086, Heilongjiang, Peoples R China

4.Northeast Agr Univ, Coll Agr, Harbin 150030, Heilongjiang, Peoples R China

5.Northeast Agr Univ, Coll Agr, Harbin 150030, Heilongjia

关键词： CT-rich regulatory motif;domestication;expression variation;seed size;soybean;WRKY gene

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

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收录情况： SCI

摘要： Soybean (Glycine max) probably originated from the wild soybean (Glycine soja). Glycine max has a significantly larger seed size, but the underlying genomic changes are largely unknown. Candidate regulatory genes were preliminarily proposed by data co-localizing RNA sequencing with the quantitative loci (QTLs) for seed size. The soybean gene locus SoyWRKY15a and its orthologous genes from G. max (GmWRKY15a) and G. soja (GsWRKY15a) were analyzed in detail. The coding sequences were nearly identical between the two orthologs, but GmWRKY15a was significantly more highly expressed than GsWRKY15a. Four haplotypes (H1-H4) were found and they varied in the size of a CT-core microsatellite locus in the 5'-untranslated region of this gene. H1 (with six CT-repeats) was the only allelic version found in G. max, while H3 (with five CT-repeats) was the dominant G. soja allele. Differential expression of this gene in soybean pods was correlated with CT-repeat variation, and manipulation of the CT copy number altered the reporter gene expression, suggesting a regulatory role for the simple sequence repeats. Seed weight of wild soybeans harboring H1 was significantly greater than that of soybeans having haplotypes H2, H3, or H4, and seed weight was correlated with gene expression, suggesting the influence of GsWRKY15a in controlling seed size. However, the seed size might be refractory to increased SoyWRKY15a expression in cultivated soybeans. The evolutionary significance of SoyWRKY15a variation in soybean seed domestication is discussed.

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