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Achieving super high yield in rice by simultaneously increasing panicle number and grain weight via improving pre-heading biomass production

Published online by Cambridge University Press:  12 September 2024

Min Huang*
Affiliation:
Rice and Product Ecophysiology, Key Laboratory of Ministry of Education for Crop Physiology and Molecular Biology, Hunan Agricultural University, Changsha 410128, China National Engineering Research Center of Rice, Hunan Agricultural University, Changsha 410128, China
Zhengwu Xiao
Affiliation:
Rice and Product Ecophysiology, Key Laboratory of Ministry of Education for Crop Physiology and Molecular Biology, Hunan Agricultural University, Changsha 410128, China National Engineering Research Center of Rice, Hunan Agricultural University, Changsha 410128, China
Shengliang Fang
Affiliation:
Hengyang Academy of Agricultural Sciences, Hengyang 421101, China
Hengdong Zhang
Affiliation:
Qianxinan Academy of Agricultural and Forest Sciences, Xingyi 562400, Guizhou
Longsheng Liu
Affiliation:
Hengyang Academy of Agricultural Sciences, Hengyang 421101, China
Fangbo Cao
Affiliation:
Rice and Product Ecophysiology, Key Laboratory of Ministry of Education for Crop Physiology and Molecular Biology, Hunan Agricultural University, Changsha 410128, China National Engineering Research Center of Rice, Hunan Agricultural University, Changsha 410128, China
Jiana Chen
Affiliation:
Rice and Product Ecophysiology, Key Laboratory of Ministry of Education for Crop Physiology and Molecular Biology, Hunan Agricultural University, Changsha 410128, China National Engineering Research Center of Rice, Hunan Agricultural University, Changsha 410128, China
*
Corresponding author: Min Huang; Email: [email protected]

Abstract

Understanding the yield attributes of rice crops grown at super high-yielding sites is useful for identifying how to achieve super high yield in rice. In this study, field experiments were conducted in 2021 and 2022 to compare grain yield and yield attributes of ten high-yielding hybrid rice varieties between Xingyi (a super high-yielding site) and Hengyang (a site with typical yields). Results showed that Xingyi produced an average grain yield of 13.4 t ha−1 in 2021 and 14.0 t ha−1 in 2022, which were, respectively, 20% and 44% higher than those at Hengyang. Higher panicles per m2 and higher grain weight were responsible for the higher grain yield at Xingyi compared to Hengyang. The higher values of panicles per m2 and grain weight at Xingyi compared to Hengyang were due to greater source capacity resulting from improved pre-heading biomass production. This study suggests that simultaneously increasing panicle number and grain weight through improving pre-heading biomass production is a potential way to achieve super high yield in rice.

Type
Research Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press

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