Chinese Bulletin of Botany ›› 2021, Vol. 56 ›› Issue (1): 80-89.DOI: 10.11983/CBB20157

• SPECIAL TOPICS • Previous Articles     Next Articles

Advances in the Molecular Mechanism and Genetic Regulation of Grain-filling Rate in Rice

Sunlu Chen1,2, Chengfang Zhan1,, Hong Jiang1,2, Linhan Li1,2, Hongsheng Zhang1,2,*()   

  1. 1State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, China
    2Cyrus Tang Innovation Center for Crop Seed Industry, Nanjing Agricultural University, Nanjing 210095, China
    3Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China
  • Received:2020-09-14 Accepted:2020-11-11 Online:2021-01-01 Published:2021-01-15
  • Contact: Chengfang Zhan,Hongsheng Zhang
  • About author:First author contact:

    † These authors contributed equally to this paper

Abstract:

High yield and good quality of rice are important guarantees for food security in China, as well as the objective which breeders are pursuing. Grain-filling rate (GFR) is an important and complex agronomic trait in rice, directly affecting grain plumpness, weight, and quality. To date, elite rice germplasm with rapid GFR is rare, and valuable gene resources for breeding remain limited, which has become a bottleneck for further improvement of yield and quality in rice breeding. Comparing with other rice agronomic traits, GFR is highly complex for its spatio-temporal dynamics and environment- dependent variability, the research of which has long been concentrated on the physiological and biochemical characteristics and cultivation measure control of grain-filling period. The study on the molecular mechanism and genetic regulation of GFR has arisen relatively recently. Here, focusing on the GFR-related genes in rice identified recently, we reviewed the preliminarily known molecular mechanism and genetic regulation of GFR, including the influence of sugar metabolism and transport-related genes on GFR, the transcriptional and translational regulatory genes in GFR, the function of grain size and weight-related quantitative trait loci (QTLs) of GFR, and the analysis of GFR-related QTLs; we also discussed the future perspective of the research strategies for GFR, especially the application potential of phenomics-related technologies for GFR research, in order to promote the foundational research and application in rice breeding.

Key words: rice, grain-filling rate, molecular mechanism, genetic regulation, quantitative trait locus