J Integr Plant Biol. ›› 2020, Vol. 62 ›› Issue (7): 1017-1033.DOI: 10.1111/jipb.12885

Special Issue: Crop yield Nutrition and stress

• Plant-abiotic Interactions • Previous Articles     Next Articles

OsCYCP4s coordinate phosphate starvation signaling with cell cycle progression in rice

Lei Xu1,2†, Fang Wang1†, Ruili Li3, Minjuan Deng1, Meilan Fu4, Huiying Teng4 and Keke Yi2   

  1. 1State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro‐products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
    2Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
    3College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
    4The Semi‐arid Agriculture Engineering & Technology Research Center of P. R. China, Shijiazhuang 050000, China

    These authors contributed equally to this work.
    Email: Keke Yi(yikeke@gmail.com)
  • Received:2019-08-31 Accepted:2019-11-04 Online:2019-11-07 Published:2020-07-01


Phosphate starvation leads to a strong reduction in shoot growth and yield in crops. The reduced shoot growth is caused by extensive gene expression reprogramming triggered by phosphate deficiency, which is not itself a direct consequence of low levels of shoot phosphorus. However, how phosphate starvation inhibits shoot growth in rice is still unclear. In this study, we determined the role of OsCYCP4s in the regulation of shoot growth in response to phosphate starvation in rice. We demonstrate that the expression levels of OsCYCP4s , except OsCYCP4;3 , were induced by phosphate starvation. Overexpression of the phosphate starvation induced OsCYCP4s could compete with the other cyclins for the binding with cyclin‐dependent kinases, therefore suppressing growth by reducing cell proliferation. The phosphate starvation induced growth inhibition in the loss‐of‐function mutants cycp4;1 , cycp4;2 , and cycp4;4 is partially compromised. Furthermore, the expression of some phosphate starvation inducible genes is negatively modulated by these cyclins, which indicates that these OsCYCP4s may also be involved in phosphate starvation signaling. We conclude that phosphate starvation induced OsCYCP4s might coordinate phosphate starvation signaling and cell cycle progression under phosphate starvation stress.

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