Biotechnology Bulletin ›› 2024, Vol. 40 ›› Issue (1): 24-31.doi: 10.13560/j.cnki.biotech.bull.1985.2023-0786

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Advances in Genetic and Molecular Mechanisms of Pre-harvest Sprouting in Rice

LIN Xin-yan1,2(), ZHANG Chuan-zhong2, DAI Bing2, WANG Xin-heng2, LIU Jian-feng1, WEN Li3, XU Xing-jian3, FANG Jun2()   

  1. 1. Jilin Provincial Key Laboratory of Plant Resource Science and Green Production, College of Life Sciences, Jilin Normal University, Siping 136000
    2. Center for Agricultural Technology, Northeast Institute of Geography and Agroecology, CAS, Harbin 150081
    3. Inner Mongolia Key Laboratory of Rice Breeding Innovation in Northern Cold Regions, Hinggan League 137400
  • Received:2023-08-08 Online:2024-01-26 Published:2024-02-06
  • Contact: FANG Jun E-mail:13936685732@163.com;fangjun@iga.ac.cn

Abstract:

Pre-harvest sprouting refers to the phenomenon that rice tends to induce seed germination on the spike if it encounters continuous cloudy and rainy weather or high-temperature and humid environmental conditions before harvest. Pre-harvest sprouting leads to decreased seed vigor and quality of rice, resulting in huge losses to rice production. In addition to expanding the screening of pre-harvest sprouting mutants, excavating and cloning some new genes controlling pre-harvest sprouting and analyzing their spike germination regulatory mechanisms are important tasks for breeding rice for pre-harvest sprouting resistance. During the process of pre-harvest sprouting, rice amylase activity is enhanced, soluble sugar content is elevated, and the content and balance of phytohormones ABA and GA in rice seeds are the key factors determining pre-harvest sprouting. Some key genes such as OsVP1 control rice seed dormancy through the ABA signaling pathway, while GA regulates seed germination through the activation of GA-associated transcription factors. The article reviews the four areas, i.e., internal physiological factors and environmental conditions of rice pre-harvest sprouting, genetic mechanisms of rice pre-harvest sprouting, molecular mechanisms of rice pre-harvest sprouting, and trait improvement of rice pre-harvest sprouting, and thus aiming to provide theoretical references for the selection of varieties that are resistant to pre-harvest sprouting in rice.

Key words: rice, pre-harvest sprouting, regulation mechanism, trait improvement