Rice nitrate transporter OsNPF7.2 positively regulates tiller number and grain yield

Rice
Jie WangZhongming Fang

Abstract

Rice tiller number is one of the most important factors that determine grain yield, while nitrogen is essential for the crop growth and development, especially for tiller formation. Genes involved in nitrogen use efficiency processes have been identified in the previous studies, however, only a small number of these genes have been found to improve grain yield by promoting tillering. We constructed over-expression (OX) lines and RNA-interference (Ri) lines, and selected a mutant of OsNPF7.2, a low-affinity nitrate transporter. Our analyses showed that rice tiller number and grain yield were significantly increased in OX lines, whereas Ri lines and mutant osnpf7.2 had fewer tiller number and lower grain yield. Under different nitrate concentrations, tiller buds grew faster in OX lines than in WT, but they grew slower in Ri lines and mutant osnpf7.2. These results indicated that altered expression of OsNPF7.2 plays a significant role in the control of tiller bud growth and regulation of tillering. Elevated expression of OsNPF7.2 also improved root length, root number, fresh weight, and dry weight. However, reduced expression of OsNPF7.2 had the opposite result on these characters. OsNPF7.2 OX lines showed more significantly enhan...Continue Reading

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Citations

Apr 13, 2020·Journal of Experimental Botany·Le LuoGuohua Xu
May 1, 2020·Frontiers in Plant Science·Dujun WangXingming Lian
Oct 11, 2019·International Journal of Molecular Sciences·Xiaoxi ZhenFan Xu
Jan 4, 2019·International Journal of Molecular Sciences·Le LuoGuohua Xu
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Aug 28, 2021·International Journal of Molecular Sciences·Mengmeng HouJingguang Chen
Sep 29, 2021·Journal of Integrative Plant Biology·Wei HeFeng Yu

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