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The endosperm-specific transcription factor TaNAC019 regulates glutenin and starch accumulation and its elite allele improves wheat grain quality

文献类型： 外文期刊

作者： Gao, Yujiao 1 ; An, Kexin 1 ; Guo, Weiwei 4 ; Chen, Yongming 1 ; Zhang, Ruijie 1 ; Zhang, Xue 1 ; Chang, Siyuan 1 ; Rossi 1 ;

作者机构： 1.China Agr Univ, State Key Lab Agrobiotechnol, Beijing 100193, Peoples R China

2.China Agr Univ, Key Lab Crop Heterosis & Utilizat MOE, Beijing 100193, Peoples R China

3.China Agr Univ, Beijing Key Lab Crop Genet Improvement, Beijing 100193, Peoples R China

4.Qingdao Agr Univ, Coll Agron, Qingdao 266109, Peoples R China

5.Res Ctr Cereal & Ind Crops, Council Agr Res & Econ, I-24126 Bergamo, Italy

6.Shandong Acad Agr Sci, Crop Res Inst, Jinan 250100, Peoples R China

期刊名称：PLANT CELL （ 影响因子：11.277； 五年影响因子：12.061 ）

ISSN： 1040-4651

年卷期： 2021 年 33 卷 3 期

页码：

收录情况： SCI

摘要： In wheat (Triticum aestivum L), breeding efforts have focused intensively on improving grain yield and quality. For quality, the content and composition of seed storage proteins (SSPs) determine the elasticity of wheat dough and flour processing quality. Moreover, starch levels in seeds are associated with yield. However, little is known about the mechanisms that coordinate SSP and starch accumulation in wheat. In this study, we explored the role of the endosperm-specific NAC transcription factor TaNAC019 in coordinating SSP and starch accumulation. TaNAC019 binds to the promoters of TaGlu-1 loci, encoding high molecular weight glutenin (HMW-GS), and of starch metabolism genes. Triple knock-out mutants of all three TaNAC019 homoeologs exhibited reduced transcript levels for all SSP types and genes involved in starch metabolism, leading to lower gluten and starch contents, and in flour processing quality parameters. TaNAC019 directly activated the expression of HMW-GS genes by binding to a specific motif in their promoters and interacting with the TaGlu-1 regulator TaGAMyb. TaNAC019 also indirectly regulated the expression of TaSPA, an ortholog of maize Opaque2 that activates SSP accumulation. Therefore, TaNAC019 regulation of starch- and SSP-related genes has key roles in wheat grain quality. Finally, we identified an elite allele (TaNAC019-BI) associated with flour processing quality, providing a candidate gene for breeding wheat with improved quality.

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