乙烯
赤霉素
苗木
生物
水稻
发芽
分生组织
延伸率
侧根
根冠
植物
园艺
细胞生物学
拟南芥
基因
生物化学
开枪
突变体
材料科学
极限抗拉强度
冶金
催化作用
作者
Hua Qin,Bharati Pandey,Yuxiang Li,Guoqiang Huang,Juan Wang,Ruidang Quan,Jiahao Zhou,Yun Zhou,Yuchen Miao,Dabing Zhang,Malcolm Bennett,Rongfeng Huang
出处
期刊:The Plant Cell
[Oxford University Press]
日期:2022-01-11
卷期号:34 (4): 1273-1288
被引量:29
标识
DOI:10.1093/plcell/koac008
摘要
Primary root growth in cereal crops is fundamental for early establishment of the seedling and grain yield. In young rice (Oryza sativa) seedlings, the primary root grows rapidly for 7-10 days after germination and then stops; however, the underlying mechanism determining primary root growth is unclear. Here, we report that the interplay of ethylene and gibberellin (GA) controls the orchestrated development of the primary root in young rice seedlings. Our analyses advance the knowledge that primary root growth is maintained by higher ethylene production, which lowers bioactive GA contents. Further investigations unraveled that ethylene signaling transcription factor ETHYLENE INSENSITIVE3-LIKE 1 (OsEIL1) activates the expression of the GA metabolism genes GIBBERELLIN 2-OXIDASE 1 (OsGA2ox1), OsGA2ox2, OsGA2ox3, and OsGA2ox5, thereby deactivating GA activity, inhibiting cell proliferation in the root meristem, and ultimately gradually inhibiting primary root growth. Mutation in OsGA2ox3 weakened ethylene-induced GA inactivation and reduced the ethylene sensitivity of the root. Genetic analysis revealed that OsGA2ox3 functions downstream of OsEIL1. Taken together, we identify a molecular pathway impacted by ethylene during primary root elongation in rice and provide insight into the coordination of ethylene and GA signals during root development and seedling establishment.
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