Involvement of sulfur assimilation in the low beta subunit content of soybean seed storage protein revealed by comparative transcriptome analysis
文献类型： 外文期刊
作者： Zhang, Xi 1 ; Xu, Ruixin 1 ; Hu, Wei 1 ; Wang, Wan 1 ; Han, Dezhi 3 ; Zhang, Fan 1 ; Gu, Yongzhe 2 ; Guo, Yong 2 ; Wang, Jun 1 ;
作者机构： 1.Yangtze Univ, Coll Agr, Jingzhou 434025, Hubei, Peoples R China
2.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Gene Resources & Genet Improvement, Beijing 100081, Peoples R China
3.Heilongjiang Acad Agr Sci, Heihe Inst, Soybean Res Ctr, Heihe 100142, Heilongjiang, Peoples R China
关键词： Soybean; beta subunit; Transcriptome analysis; Sulfur-containing amino acids; Sulfur assimilation
期刊名称：CROP JOURNAL （ 影响因子：4.407； 五年影响因子：5.687 ）
ISSN： 2095-5421
年卷期： 2019 年 7 卷 4 期
页码：
收录情况： SCI
摘要： The beta subunit of soybean [Glycine max (L.) Merr.] seed storage protein is of great significance in sulfur-containing amino acid balance and soybean processing properties. The objective of this study was to elucidate the relationship between the beta subunit and sulfur-containing amino acid composition, and the potential regulatory mechanism. The beta subunit was independently accumulated in comparison with other major subunits (alpha/alpha', acidic, basic, and A3) during seed filling, and a low level of beta subunit content (BSC) was formed during the accumulation process. In low-BSC mature seeds, crude protein, oil content, and fatty acid composition were not changed, but sulfur-containing amino acids (Cys + Met) in the low-BSC seeds increased significantly (by 31.5%), suggesting that an internal regulatory mechanism within seed might be responsible for the rebalance of seed protein composition and that sulfur assimilation might be deeply involved in beta subunit accumulation. Transcriptomic analysis revealed that genes involved in anabolism of cysteine, methionine, and glutathione were up-regulated but those involved in the catabolism of these compounds were down-regulated, suggesting a relationship between the elevation of methionine and glutathione and low BSC. Our study sheds light on seed composition in low BSC lines and on the potential molecular regulatory mechanism of beta subunit accumulation, broadening our understanding of soybean seed protein synthesis and its regulation. (C) 2019 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.
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