研究人员发现OsWRI1a (WRINKLED1a) 是协调水稻根系和地上部生长响应外部氮供应的调控中心，从而稳定根冠比。在根中，OsWRI1a通过促进生长素积累来促进n响应性发育。同时，茎部OsWRI1a刺激分蘖发育，从而促进茎部生长。该团队鉴定出了一个优秀的OsWRI1a单倍型，该单倍型在缺氮条件下能最大限度地减少根冠比波动，提高氮素主效和籽粒产量。他们的发现揭示了协调氮响应型可持续农业增长分配的核心机制。
据悉，氮(N)缺乏引起的植物根冠生物量比的增加在自然界是适应性的，但在农业上不是最理想的。了解这种发育可塑性的调控机制有助于在减少肥料施用的同时提高作物性能。
附：英文原文
Title: OsWRI1a coordinates systemic growth responses to nitrogen availability in rice
Author: Chengbo Shen, Zhe Ji, Wu Jiao, Siyu Zhang, Yunzhi Huang, Yaojun Qin, Menghan Huang, Shuming Kang, Zulong Mo, Bingyu Jiang, Ying Yu, Yajing Song, Yue Li, Jiayi Xu, Yanan Tian, Yanjie Xie, Guosheng Xiong, Shaokui Wang, Guohua Xu, Xiangdong Fu, Shan Li
Issue&Volume: 2026-02-26
Abstract: Nitrogen (N) deficiency–induced increases in the root-to-shoot biomass ratio in plants are adaptive in nature but suboptimal for agriculture. Understanding the regulatory mechanisms governing this developmental plasticity could help improve crop performance while reducing fertilizer application. We identified OsWRI1a (WRINKLED1a) as a regulatory hub coordinating rice root and shoot growth in response to external N supply, thereby stabilizing the root-to-shoot ratio. In roots, OsWRI1a enhances N-responsive development by promoting auxin accumulation. Meanwhile, shoot OsWRI1a stimulates tiller development and therefore shoot growth. We identified an elite OsWRI1a haplotype that minimizes root-to-shoot ratio fluctuation under N deficiency, improving N-use efficiency and grain yield. Our findings reveal a central mechanism coordinating N-responsive growth allocation for sustainable agriculture.
DOI: aeb8384
Source: https://www.science.org/doi/10.1126/science.aeb8384