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Contrasting yield formation characteristics in two super-rice hybrids that differ in growth duration

文献类型： 外文期刊

作者： Huang, Min 1 ; Tao, Zui 1 ; Lei, Tao 1 ; Cao, Fangbo 1 ; Chen, Jiana 1 ; Yin, Xiaohong 1 ; Zou, Yingbin 1 ; Liang, Tianfeng 2 ;

作者机构： 1.Hunan Agr Univ, Coll Agron, Crop & Environm Res Ctr, Changsha 410128, Peoples R China

2.Guangxi Acad Agr Sci, Rice Res Inst, Guangxi Key Lab Rice Genet & Breeding, Nanning 530007, Peoples R China

关键词： Grain yield; Growth duration; Rice

期刊名称：EXPERIMENTAL AGRICULTURE （ 影响因子：2.234； 五年影响因子：2.208 ）

ISSN： 0014-4797

年卷期： 2021 年 57 卷 3 期

页码：

收录情况： SCI

摘要： The development of high-yielding, short-duration super-rice hybrids is important for ensuring food security in China where multiple cropping is widely practiced and large-scale farming has gradually emerged. In this study, field experiments were conducted over 3 years to identify the yield formation characteristics in the shorter-duration (similar to 120 days) super-rice hybrid 'Guiliangyou 2' (G2) by comparing it with the longer-duration (similar to 130 days) super-rice hybrid 'Y-liangyou 1' (Y1). The results showed that G2 had a shorter pre-heading growth duration and consequently a shorter total growth duration compared to Y1. Compared to Y1, G2 had lower total biomass production that resulted from lower daily solar radiation, apparent radiation use efficiency (RUE), crop growth rate (CGR), and biomass production during the preheading period, but the grain yield was not significantly lower than that of Y1 because it was compensated for by the higher harvest index that resulted from slower leaf senescence (Le., slower decline in leaf area index during the post-heading period) and higher RUE, CGR, and biomass production during the post-heading period. Our findings suggest that it is feasible to reduce the dependence of yield formation on growth duration to a certain extent in rice by increasing the use efficiency of solar radiation through crop improvement and also highlight the need for a greater fundamental understanding of the physiological processes involved in the higher use efficiency of solar radiation in super-rice hybrids.

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