文献类型： 外文期刊

作者： Jiang, Meng ¹ ; Zhang, Huali ⁴ ; Song, Yue ³ ; Chen, Jiale ³ ; Bai, Jianjiang ¹ ; Tang, Jianhao ¹ ; Wang, Qing ² ; Fotopoulos, Vasileios ⁷ ; Zhu, Qian-Hao ⁸ ; Yang, Ruifang ¹ ; Li, Ruiqing ² ;

作者机构： 1.Shanghai Acad Agr Sci, Minist Agr & Rural Affairs, Crop Breeding & Cultivat Res Inst, Key Lab Germplasm Innovat & Genet Improvement Grai, Shanghai 201403, Peoples R China

2.Anhui Agr Univ, Coll Agron, Hefei 230036, Peoples R China

3.Zhejiang Univ, Hainan Inst, Yazhou Bay Scitech City, Sanya 572000, Peoples R China

4.China Natl Rice Res Inst, State Key Lab Rice Biol, Hangzhou 311400, Peoples R China

5.China Natl Rice Res Inst, Chinese Natl Ctr Rice Improvement, Hangzhou 311400, Peoples R China

6.Wuxi Hupper Bioseed Technol Inst Ltd, Wuxi 214000, Jiangsu, Peoples R China

7.Cyprus Univ Technol, Dept Agr Sci Biotechnol & Food Sci, CY-3603 Lemesos, Cyprus

8.CSIRO Agr & Food, GPO Box 1700, Canberra, ACT 2601, Australia

关键词： grain filling; amylose; seed formation; AGPS1; natural variation; starch synthesis

期刊名称：PLANT JOURNAL （ 影响因子：6.2； 五年影响因子：7.1 ）

ISSN： 0960-7412

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Understanding and optimizing the process of grain filling helps the quest to maximize rice (Oryza sativa L.) seed yield and quality, yet the intricate mechanisms at play remain fragmented. Transcription factors (TFs) are major players in the gene networks underlying the grain filling process. Here, we employed grain incomplete filling (OsGIF1)/cell wall invertase 2, a key gene involved in grain filling, to explore its upstream TFs and identified a bZIP family TF, OsbZIP10, to be a transcriptional activator of OsGIF1. Rice grains of the knockouts of OsbZIP10 showed increased white-core rates but lower amylose content (AC), leading to better eating and cooking qualities in all genetic backgrounds investigated, though the impact of mutations in OsbZIP10 on grain weight depended on genetic background. Multi-omics analyses suggested that, in addition to OsGIF1, multiple genes involved in different biological processes contributing to grain filling were targeted by OsbZIP10, including OsAGPS1, a gene encoding the ADP-Glc pyrophosphorylase (AGPase) small subunit, and genes contributing to homeostasis of reactive oxygen species. Distinct genetic make-up was observed in OsbZIP10 between japonica and indica rice varieties, with the majority varieties of each subspecies belonging to two different haplotypes that were closely associated with AC. Overexpressing the haplotype linked to high-AC in the low-AC genetic background increased AC. Overall, this study sheds crucial light on the significance of the OsbZIP10-OsGIF1 module in the determination of rice grain quality, offering a potential avenue for genetic engineering of rice to produce seeds with tailored attributes.