Journal of Zhejiang Agricultural Sciences ›› 2025, Vol. 66 ›› Issue (6): 1297-1307.DOI: 10.16178/j.issn.0528-9017.20240808

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Progress in molecular mechanism research of indica-japonica hybrid rice

MA Shuangshuang1(), HUANG Lingling2, WANG Wei1, YANG Yongdan1, ZHAI Rongrong2, YE Jing2, WU Mingming2, YE Shenghai2,*()   

  1. 1. Zhejiang Anji Agricultural Investment High-Tech Group Co., Ltd., Anji 313300, Zhejiang
    2. Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, Zhejiang
  • Received:2024-10-18 Online:2025-06-11 Published:2025-06-23

Abstract:

Asian cultivated rice (Oryza sativa L.) has differentiated into two subspecies, indica and japonica, during domestication, exhibiting significant variations in cultivation environments, plant and grain characteristics, and genome. The effective utilization of genetic divergence between indica and japonica subspecies could further enhance rice yield through their strong heterosis. This paper systematically reviews the taxonomic classification and differentiation characteristics between indica and japonica, discusses currently mapped and cloned intersubspecific hybrid sterility genes and their molecular mechanisms, analyzes identified heterosis-related genes and their functional mechanisms, and compiles data of certified indica-japonica hybrid rice varieties approved at provincial or national levels. These comprehensive analyses aim to provide valuable insights for advancing research on intersubspecific heterosis utilization and developing novel indica-japonica hybrid rice cultivars.

Key words: indica and japonica differentiation, hybrid infertility, heterosis

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