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Over-Expressing TaSPA-B Reduces Prolamin and Starch Accumulation in Wheat (Triticum aestivum L.) Grains

文献类型： 外文期刊

作者： Guo, Dandan 1 ; Hou, Qiling 1 ; Zhang, Runqi 1 ; Lou, Hongyao 1 ; Li, Yinghui 1 ; Zhang, Yufeng 1 ; You, Mingshan 1 ; Xie 1 ;

作者机构： 1.China Agr Univ, Beijing Key Lab Crop Genet Improvement, Minist Educ, Key Lab Crop Heterosis & Utilizat MOE, Beijing 100193, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Beijing Engn Res Ctr Hybrid Wheat, Beijing 100097, Peoples R China

3.Univ Haifa, Inst Evolut, IL-3498838 Haifa, Israel

关键词： Triticum aestivum L; TaSPA; transcriptome sequencing; prolamin; starch; wheat grains

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN：

年卷期： 2020 年 21 卷 9 期

页码：

收录情况： SCI

摘要： Starch and prolamin composition and content are important indexes for determining the processing and nutritional quality of wheat (Triticum aestivum L.) grains. Several transcription factors (TFs) regulate gene expression during starch and protein biosynthesis in wheat. Storage protein activator (TaSPA), a member of the basic leucine zipper (bZIP) family, has been reported to activate glutenin genes and is correlated to starch synthesis related genes. In this study, we generated TaSPA-B overexpressing (OE) transgenic wheat lines. Compared with wild-type (WT) plants, the starch content was slightly reduced and starch granules exhibited a more polarized distribution in the TaSPA-B OE lines. Moreover, glutenin and omega- gliadin contents were significantly reduced, with lower expression levels of related genes (e.g., By15, Dx2, and omega-1,2 gliadin gene). RNA-seq analysis identified 2023 differentially expressed genes (DEGs). The low expression of some DEGs (e.g., SUSase, ADPase, Pho1, Waxy, SBE, SSI, and SS II a) might explain the reduction of starch contents. Some TFs involved in glutenin and starch synthesis might be regulated by TaSPA-B, for example, TaPBF was reduced in TaSPA-B OE-3 lines. In addition, dual-luciferase reporter assay indicated that both TaSPA-B and TaPBF could transactivate the promoter of omega-1,2 gliadin gene. These results suggest that TaSPA-B regulates a complex gene network and plays an important role in starch and protein biosynthesis in wheat.

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