Loss of Gn1a/OsCKX2 confers heavy-panicle rice with excellent lodging resistance

文献类型： 外文期刊

第一作者： Tu, Bin

作者： Tu, Bin;Yin, Junjie;Zhu, Xiaobo;Yuan, Hua;Li, Ting;Qin, Peng;Li, Shigui;Tu, Bin;Tao, Zhang;Zhou, Lei;Zheng, Ling;Li, Xinzi;Zhang, Xiaoyu;Chen, Weilan;Qin, Peng;Ma, Bingtian;Wang, Yuping;Li, Shigui;Wang, Shiguang;Zheng, Ling;Zhang, Chun

作者机构：

关键词： culm strength; crown root; Gn1a; OsCKX2; heavy-panicle rice; lodging resistance

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：9.106； 五年影响因子：8.241 ）

ISSN： 1672-9072

年卷期： 2022 年 64 卷 1 期

页码：

收录情况： SCI

摘要： Significant achievements have been made in breeding programs for the heavy-panicle-type (HPT) rice (Oryza sativa) in Southwest China. The HPT varieties now exhibit excellent lodging resistance, allowing them to overcome the greater pressures caused by heavy panicles. However, the genetic mechanism of this lodging resistance remains elusive. Here, we isolated a major quantitative trait locus, Panicle Neck Diameter 1 (PND1), and identified the causal gene as GRAIN NUMBER 1A/CYTOKININ OXIDASE 2 (Gn1A/OsCKX2). The null gn1a allele from rice line R498 (gn1a(R498)) improved lodging resistance through increasing the culm diameter and promoting crown root development. Loss-of-function of Gn1a/OsCKX2 led to cytokinin accumulation in the crown root tip and accelerated the development of adventitious roots. Gene pyramiding between the null gn1a(R498) allele with two gain-of-function alleles, STRONG CULM 2 (SCM2) and SCM3, further improved lodging resistance. Moreover, Gn1a/OsCKX2 had minimal influence on overall rice quality. Our research thus highlights the distinct genetic components of lodging resistance of HPT varieties and provides a strategy for tailor-made crop improvement of both yield and lodging resistance in rice.

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