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Orchestration of ethylene and gibberellin signals determines primary root elongation in rice

Qin, Hua; Pandey, Bipin K; Li, Yuxiang; Huang, Guoqiang; Wang, Juan; Quan, Ruidang; Zhou, Jiahao; Zhou, Yun; Miao, Yuchen; Zhang, Dabing; Bennett, Malcolm J; Huang, Rongfeng

Orchestration of ethylene and gibberellin signals determines primary root elongation in rice Thumbnail


Authors

Hua Qin

Yuxiang Li

Guoqiang Huang

Juan Wang

Ruidang Quan

Jiahao Zhou

Yun Zhou

Yuchen Miao

Dabing Zhang

Rongfeng Huang



Abstract

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.

Citation

Qin, H., Pandey, B. K., Li, Y., Huang, G., Wang, J., Quan, R., …Huang, R. (2022). Orchestration of ethylene and gibberellin signals determines primary root elongation in rice. Plant Cell, 34(4), 1273-1288. https://doi.org/10.1093/plcell/koac008

Journal Article Type Article
Acceptance Date Jan 6, 2022
Online Publication Date Jan 11, 2022
Publication Date 2022-04
Deposit Date Feb 28, 2022
Publicly Available Date Mar 29, 2024
Journal Plant Cell
Print ISSN 1040-4651
Electronic ISSN 1532-298X
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 34
Issue 4
Pages 1273-1288
DOI https://doi.org/10.1093/plcell/koac008
Keywords Cell Biology; Plant Science
Public URL https://nottingham-repository.worktribe.com/output/7349354
Publisher URL https://academic.oup.com/plcell/advance-article-abstract/doi/10.1093/plcell/koac008/6503509?redirectedFrom=fulltext

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