Acta Agriculturae Boreali-Sinica ›› 2022, Vol. 37 ›› Issue (1): 86-94. doi: 10.7668/hbnxb.20192499

Special Issue: Rice Cultivation & Physiology

• Tillage & Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Regulatory Effects of Two Grain Filling Regulators on Inferior Spikelets Filling of Large Panicle Rice

JING Lili, PENG Ting, ZHAO Yafan, ZHAO Shuaibing, WANG Tongtong, LI Yuan, CHENG Yuan, DU Yanxiu, ZHANG Jing, SUN Hongzheng, ZHAO Quanzhi   

  1. Collaborative Innovation Center of Henan Grain Crops,Key Laboratory of Rice Biology in Henan Province,Rice Engineering Laboratory in Henan Province,College of Agronomy, Henan Agricultural University,Zhengzhou 450046,China
  • Received:2021-07-13 Published:2022-02-28

Abstract:

In order to explore the effects and mechanism of grain filling regulators on inferior spikelets filling of large panicle rice varieties,large panicle rice variety Jiaoyuanyou 216 was selected as material and an open field experiment was conducted by spraying exogenous grain filling regulators(Helifeng and Xinmeizhouxing)at heading stage.Meanwhile,endogenous hormone contents,expressions of filling-related miRNAs and their targets,and genes encoding filling-related proteins and sucrose-starch metabolism key enzymes were measured.The results should that the two grain filling regulators of Helifeng and Xinmeizhouxing significantly increased the yield of Jiaoyuanyou 216,the 1000-grain weight,filling rate and initial grain filling potential of inferior spikelets.Specifically,compared with the control(spraying water),the 1000-grain weight of inferior spikelets increased by 16.07% and 15.89%,respectively.Content of IAA in inferior spikelets increased significantly at 9,15,21 d after flowering,and the content of Z+ZR increased significantly at 9,21 d after flowering.Under Helifeng treatment,expressions of miR167a-c,miR167d-j and miR1432 were significantly down-regulated at 6 d after flowering,OsGF14b and OsGF14f were significantly down-regulated at 12 after flowering. What's more,expression of OsGLP3,a gene encoding germin-like protein was significantly up-regulated at 6 d after flowering,and expressions of sucrose-starch metabolism key enzyme related genes were significantly up-regulated at 6,12 d after flowering.However,under Xinmeizhouxing treatment,expressions of miR167a-c,miR167d-j,miR1432 were significantly down-regulated at 6 d after flowering,and expressions of OsGF14b and OsGF14f were significantly down-regulated at 12 d after flowering.More importantly,expressions of OsGLP3 and sucrose-starch metabolism key enzyme related genes were significantly up-regulated at 6,12 d after flowering.Correlation analysis results showed that the filling rate of inferior spikelets was significantly negatively correlated with the expression of miR1432 and OsGF14f,while was significantly positively correlated with the content of IAA.Therefore,Helifeng and Xinmeizhouxing may regulate the expressions of filling-related miRNAs and their targets,as well as the genes of filling-related proteins and sucrose-starch metabolism key enzymes in the pre-and mid-filling period and increase the content of IAA and Z+ZR to promote inferior spikelets filling.

Key words: Rice, Inferior spikelets, Grain filling, Regulators, miRNA, Sucrose-starch metabolism key enzyme related genes

Cite this article

JING Lili, PENG Ting, ZHAO Yafan, ZHAO Shuaibing, WANG Tongtong, LI Yuan, CHENG Yuan, DU Yanxiu, ZHANG Jing, SUN Hongzheng, ZHAO Quanzhi. Regulatory Effects of Two Grain Filling Regulators on Inferior Spikelets Filling of Large Panicle Rice[J]. Acta Agriculturae Boreali-Sinica, 2022, 37(1): 86-94. doi: 10.7668/hbnxb.20192499.

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