数字农科院2.0

Pleiotropic effects of rice florigen gene RFT1 on the amino acid content of unmilled rice

文献类型： 外文期刊

作者： 谢黎虹;;朱玉君;;唐绍清;;魏祥进;;圣忠华;;焦桂爱;;胡培松;;庄杰云

作者机构：

关键词： Amino Acid Content; Heading Date; Near Isogenic Line; Pleiotropic Effect; Quantitative Trait Locus; Oryza Sativa L

期刊名称： Frontiers in Genetics

ISSN： 1664-8021

年卷期： 2020 年 11 卷

页码：

收录情况： JCR（2021版）

摘要： In rice, the contents of protein and amino acids are the major parameters of nutritional quality. Co-localization of quantitative trait loci (QTLs) for heading date and protein content were reported, but pleiotropism of heading-date genes on protein contents has not been investigated. Here, we reported that rice florigen gene RFT1 plays an important role in controlling amino acid contents of rice grain. Firstly, 73 QTLs for the contents of 17 amino acids in unmilled rice were detected using recombinant inbred lines (RILs) of the indica rice cross Zhenshan 97 (ZS97)/Milyang 46 (MY46). Then, the effect of the largest cluster consisting of 14 QTLs, located in proximity to the rice florigen genes RFT1 and Hd3a, was validated using three populations consisting of near isogenic lines (NILs) that only segregated a region covering the target QTL. The first and second NIL populations were derived from a residual heterozygote identified from the ZS97/MY46 RIL population, consisting of homozygous lines that were only segregated in a 29.9-kb region covering the two florigen genes and a 1.7-kb region for RFT1, respectively. The third NIL population was segregated for the RFT1 (ZS97) transgene in the background of japonica rice cultivar Zhonghua 11. In all the three NIL populations, RFT1 was shown to have a strong effect on the contents of most amino acids, with the ZS97 allele always having the reducing effects. By comparing QTLs for amino acid contents detected in the ZS97/MY46 RIL population and genes/QTLs previously identified for heading date difference between ZS97 and MY46, possible pleiotropism on amino acid contents was also shown for other key heading-date genes including Hd1, Ghd7, and OsGI.

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