Journal of Integrative Agriculture ›› 2020, Vol. 19 ›› Issue (11): 2643-2655.DOI: 10.1016/S2095-3119(20)63251-8

所属专题: 水稻耕作栽培合辑Rice Physiology · Biochemistry · Cultivation · Tillage

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  • 收稿日期:2020-03-02 出版日期:2020-11-01 发布日期:2020-10-15

Morpho-physiological traits contributing to better yield performance of japonica/indica hybrids over indica hybrids under input-reduced practices

WEI Huan-he1, MENG Tian-yao2, GE Jia-lin1, ZHANG Xu-bin1, LU Yu1, LI Xin-yue1, TAO Yuan1, DING En-hao1, CHEN Ying-long1, DAI Qi-gen
  

  1. 1 Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Research Institute of Rice Industrial Engineering Technology, Yangzhou University, Yangzhou 225009, P.R.China
    2 Institute of Agricultural Science and Technology Development, Yangzhou University/Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education, Yangzhou 225009, P.R.China
  • Received:2020-03-02 Online:2020-11-01 Published:2020-10-15
  • Contact: Correspondence DAI Qi-gen, Tel: +86-514-87970292, E-mail: qgdai@yzu.edu.cn
  • About author:WEI Huan-he, Tel: +86-514-87970292, E-mail: hhwei@yzu.edu.cn;
  • Supported by:
    This work was financed by the National Natural Science Foundation of China (31901448), the Natural Science Foundation of the Jiangsu Higher Education Institutions, China (19KJB210004) and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China.

Abstract:

It is widely reported that japonica/indica hybrids (JIH) have superior grain yield over other main varietal groups such as indica hybrids (IH) under sufficient resource inputs.  To date, little attention has been paid to yield performance of JIH under input-reduced practices, and whether JIH could have better grain yield performance over IH under input-reduced practices.  In this study, three JIH varieties and three IH varieties were compared in grain yield and their related morpho-physiological traits under two cultivation modes, i.e., conventional high-yielding method (CHYM) and double reductions in nitrogen rate and planting density (DRNP).  Our results showed that JIH had 8.3 and 13.3% higher grain yield over IH under CHYM and DRNP, respectively.  The superior grain yield of JIH over IH under DRNP was mainly attributed to larger sink size and improved sink filling efficiency.  Three main morpho-physiological traits were concluded for better yield performance of JIH over IH under DRNP.  Firstly, JIH had the reduced unproductive tillers growth, indicated by a higher percentage of productive tillers and the percentage of effective leaf area index (LAI) to total LAI at heading stage.  Secondly, a synergistic increase in biomass accumulation and harvest index were achieved of JIH, supported by higher biomass accumulation and leaf area duration during the main growth periods, and improved non-structural carbohydrate (NSC) remobilization after heading.  Thirdly, JIH had an improved canopy structure, showing as higher leaf area of upper three leaves and lower light extinction coefficient.  Our results suggested that improved morpho-physiological traits of JIH could lead to better grain yield performance over IH under input-reduced practices.

Key words: japonica/indica hybrid rice ,  grain yield ,  input-reduced practices