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

Published online by Cambridge University Press:  21 July 2021

Min Huang*
Affiliation:
Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha 410128, China
Zui Tao
Affiliation:
Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha 410128, China
Tao Lei
Affiliation:
Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha 410128, China
Fangbo Cao
Affiliation:
Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha 410128, China
Jiana Chen
Affiliation:
Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha 410128, China
Xiaohong Yin
Affiliation:
Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha 410128, China Guangxi Key Laboratory of Rice Genetics and Breeding, Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
Yingbin Zou
Affiliation:
Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha 410128, China
Tianfeng Liang*
Affiliation:
Guangxi Key Laboratory of Rice Genetics and Breeding, Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
*
*Corresponding authors. Emails: mhuang@hunau.edu.cn; tfliang@gxaas.net
*Corresponding authors. Emails: mhuang@hunau.edu.cn; tfliang@gxaas.net

Summary

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 (∼120 days) super-rice hybrid ‘Guiliangyou 2’ (G2) by comparing it with the longer-duration (∼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 pre-heading 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 (i.e., 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.

Type
Research Article
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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