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Defective mitochondrial function by mutation in THICK ALEURONE 1 encoding a mitochon-driontargeted single-stranded DNA-binding protein leads to increased aleurone cell layers and improved nutrition in rice

文献类型： 外文期刊

作者： Li, Dong-Qi 1 ; Wu, Xiao-Ba 1 ; Wang, Hai-Feng 3 ; Feng, Xue 1 ; Yan, Shi-Juan 4 ; Wu, Sheng-Yang 1 ; Liu, Jin-Xin 1 ; Ya 1 ;

作者机构： 1.Chinese Acad Sci, Inst Bot, Key Lab Plant Mol Physiol, Beijing 100093, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100864, Peoples R China

3.Shandong Acad Agr Sci, Rice Res Inst, Jinan 250100, Peoples R China

4.Guangdong Acad Agr Sci, Agrobiol Gene Res Ctr, Guangdong Key Lab Crop Germplasm Resources Preser, Guangzhou 510640, Peoples R China

5.Chinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R China

6.Peking Univ, Sch Adv Agr Sci, Beijing 100871, Peoples R China

7.Chinese Acad Sci, Innovat Acad Seed Design, Beijing 100101, Peoples R China

关键词： rice; thick aleurone; cell-fate determination; nutritional improvement; mitochondria

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

ISSN： 1674-2052

年卷期： 2021 年 14 卷 8 期

页码：

收录情况： SCI

摘要： Cereal endosperm comprises an outer aleurone and an inner starchy endosperm. Although these two tissues have the same developmental origin, they differ in morphology, cell fate, and storage product accumulation, with the mechanism largely unknown. Here, we report the identification and characterization of rice thick aleurone 1 (ta1) mutant that shows an increased number of aleurone cell layers and increased contents of nutritional factors including proteins, lipids, vitamins, dietary fibers, and micronutrients. We identified that the TA1 gene, which is expressed in embryo, aleurone, and subaleurone in caryopses, encodes a mitochondrion-targeted protein with single-stranded DNA-binding activity named OsmtSSB1. Cytological analyses revealed that the increased aleurone cell layers in ta1 originate from a developmental switch of subaleurone toward aleurone instead of starchy endosperm in the wild type. We found that TA1/OsmtSSB1 interacts with mitochondrial DNA recombinase RECA3 and DNA helicase TWINKLE, and down-regulation of RECA3 or TWINKLE also leads to ta1-like phenotypes. We further showed that mutation in TA1/OsmtSSB1 causes elevated illegitimate recombinations in the mitochondrial genome, altered mitochondrial morphology, and compromised energy supply, suggesting that the OsmtSSB1-mediated mitochondrial function plays a critical role in subaleurone cell-fate determination in rice.

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[1]Defective mitochondrial function by mutation in THICK ALEURONE 1 encoding a mitochon-driontargeted single-stranded DNA-binding protein leads to increased aleurone cell layers and improved nutrition in rice. Li, Dong-Qi,Wu, Xiao-Ba,Feng, Xue,Wu, Sheng-Yang,Liu, Jin-Xin,Yao, Xue-Feng,Bai, Ai-Ning,Song, Xiu-Fen,Liu, Chun-Ming,Li, Dong-Qi,Wu, Xiao-Ba,Wu, Sheng-Yang,Liu, Jin-Xin,Yao, Xue-Feng,Bai, Ai-Ning,Song, Xiu-Fen,Liu, Chun-Ming,Wang, Hai-Feng,Zhang, Shi-Yong,Yan, Shi-Juan,Zhao, Heng,Guo, Lin,Liu, Chun-Ming,Liu, Chun-Ming,Liu, Chun-Ming. 2021

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