Nitrogen nutrition contributes to plant fertility by affecting meiosis initiation

Han Yang, Yafei Li, Yiwei Cao, Wenqing Shi, En Xie, Na Mu, Guijie Du, Yi Shen, Ding Tang and Zhukuan Cheng ()
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Han Yang: Chinese Academy of Sciences
Yafei Li: Chinese Academy of Sciences
Yiwei Cao: Chinese Academy of Sciences
Wenqing Shi: Chinese Academy of Sciences
En Xie: Chinese Academy of Sciences
Na Mu: Chinese Academy of Sciences
Guijie Du: Chinese Academy of Sciences
Yi Shen: Chinese Academy of Sciences
Ding Tang: Chinese Academy of Sciences
Zhukuan Cheng: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-15

Abstract: Abstract Nitrogen (N), one of the most important plant nutrients, plays crucial roles in multiple plant developmental processes. Spikelets are the primary sink tissues during reproductive growth, and N deficiency can cause floral abortion. However, the roles of N nutrition in meiosis, the crucial step in plant sexual reproduction, are poorly understood. Here, we identified an N-dependent meiotic entrance mutant with loss of function of ELECTRON TRANSFER FLAVOPROTEIN SUBUNIT β (ETFβ) in rice (Oryza sativa). etfβ displayed meiosis initiation defects, excessive accumulation of branched-chain amino acids (BCAAs) and decrease in total N contents in spikelets under N starvation, which were rescued by applying excess exogenous inorganic N. Under N starvation, ETFβ, through its involvement in BCAA catabolism, promotes N reutilization and contributes to meeting N demands of spikelets, highlighting the impact of N nutrition on meiosis initiation. We conclude that N nutrition contributes to plant fertility by affecting meiosis initiation.

Date: 2022
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DOI: 10.1038/s41467-022-28173-3

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