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Enhanced Root System Development Responses of a Newly Identified Mutation Gene Promoting Lateral Root Development to Various Nitrogen Conditions in Rice

Lucob-Agustin, Nonawin Hasegawa, Tomomi Jinno, Kyosuke Suralta, Roel R. Niones, Jonathan M. Kano-Nakata, Mana Yamauchi, Akira Inukai, Yoshiaki 名古屋大学

2020.03

概要

Lateral roots (LRs), which largely constitute the root system, allow the entire root system to expand to a larger area to efficiently capture water and nutrients from the soil. Thus, the optimization of LRs should be considered for the genetic improvement of root system architecture to most notably impact plant acquisition of soil resources for productivity. In this study, we newly identified a rice mutant, 11NB10, which has a high number of thick, long, and highly branched LRs (L-type LRs) with promoted parental root growth. We evaluated the root performance of this mutant under various nitrogen (N) regimes, including 30, 60, and 120 mg N corresponding to low, standard, and high N conditions, respectively. The results showed that under low N conditions, the 11NB10 mutant had a larger root system based on its total root length, which increased further with increasing N levels, compared to its wild-type, Nipponbare. This promoted root system growth could be attributed to the development of highly branched L-type LRs, which in turn might contributed to higher leaf area and shoot dry matter production. These findings suggest that the 11NB10 mutation gene promotes a highly developed root system under low N conditions, and its root performance could be further improved by enhancing LR development through N application. Thus, the 11NB10 mutant is a promising line for the breeding programs targeting root system architecture in rice.

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