OsAAP6 functions as an important regulator of grain protein content and nutritional quality in rice

Bo Peng, Huili Kong, Yibo Li, Lingqiang Wang, Ming Zhong, Liang Sun, Guanjun Gao, Qinglu Zhang, Lijun Luo, Gongwei Wang, Weibo Xie, Junxiao Chen, Wen Yao, Yong Peng, Lei Lei, Xingmin Lian, Jinghua Xiao, Caiguo Xu, Xianghua Li and Yuqing He ()
Additional contact information
Bo Peng: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Huili Kong: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Yibo Li: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Lingqiang Wang: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Ming Zhong: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Liang Sun: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Guanjun Gao: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Qinglu Zhang: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Lijun Luo: Shanghai Agrobiological Gene Center
Gongwei Wang: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Weibo Xie: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Junxiao Chen: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Wen Yao: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Yong Peng: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Lei Lei: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Xingmin Lian: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Jinghua Xiao: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Caiguo Xu: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Xianghua Li: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China
Yuqing He: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Hongshan District, Wuhan 430070, China

Nature Communications, 2014, vol. 5, issue 1, 1-12

Abstract: Abstract Grains from cereals contribute an important source of protein to human food, and grain protein content (GPC) is an important determinant of nutritional quality in cereals. Here we show that the quantitative trait locus (QTL) qPC1 in rice controls GPC by regulating the synthesis and accumulation of glutelins, prolamins, globulins, albumins and starch. qPC1 encodes a putative amino acid transporter OsAAP6, which functions as a positive regulator of GPC in rice, such that higher expression of OsAAP6 is correlated with higher GPC. OsAAP6 greatly enhances root absorption of a range of amino acids and has effects on the distribution of various amino acids. Two common variations in the potential cis-regulatory elements of the OsAAP6 5′-untranslated region seem to be associated with GPC diversity mainly in indica cultivars. Our results represent the first step toward unravelling the mechanism of regulation underlying natural variation of GPC in rice.

Date: 2014
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DOI: 10.1038/ncomms5847

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