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Delivering transformational yield gains with super hybrid rice

Citation

Deng, J and Harrison, MT and Liu, K and Ye, J and Xiong, X and Fahad, S and Huang, L and Tian, X and Zhang, Y, Delivering transformational yield gains with super hybrid rice, Frontiers in Plant Science ISSN 1664-462X (In Press) [Refereed Article]


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2021. The Authors. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

Abstract

Super hybrid rice genotypes have transformed the rate of genetic yield gain primarily due to inter-subspecific heterosis, although the physiological basis underpinning this yield transformation have not been well quantified. We assessed the radiation use efficiency (RUE) and nitrogen use efficiency (NUE) of novel hybrid rice genotypes under four management practices representative of rice cropping systems in China. Y-liangyou 900 (YLY900), a new super hybrid rice widely adopted in China, was examined in field experiments conducted in Jingzhou and Suizhou, Hubei Province, China, from 2017 to 2020. Four management practices were conducted: nil fertilizer (CK), conventional farmer practice (FP), optimized cultivation with reduced nitrogen (OPT-N) and optimized cultivation with increased nitrogen (OPT+N). Yield differences across the treatment regimes were significant (p<0.05). Grain yield of OPT+N in Jingzhou and Suizhou were 11 and 12 t ha-1, which was 14% and 27% greater than yields obtained under OPT-N and FP, respectively. 26 Relative to OPT-N and FP, OPT+N had greater panicle numbers (9%, 18%), spikelets per panicle (7%, 12%), spikelets per unit area (17%, 32%) and total dry weight (9%, 19%). Average RUE of OPT+N was 2.7 g MJ-1, which was 5% and 9% greater than that of OPT-N and FP, respectively, due to higher intercepted photosynthetically active radiation (IPAR). The agronomic efficiency of applied N (AEN) of OPT+N was 17 kg grain kg-1N, which was 9% and 68% higher than that of OPT-N and FP. It is shown that close correlations between yield and both panicles number (R2=0.91) and spikelets per panicle (R2=0.83) in OPT+N. We conclude that grain yields of OPT+N were associated with greater IPAR, RUE and total dry matter. We suggest that integrated management practices are conducive to higher grain yield and resource use efficiency through expansion of sink potential in super hybrid rice production.

Item Details

Item Type:Refereed Article
Keywords:super hybrid rice, management, dry matter, grain yield, nitrogen use efficiency, radiation use efficiency
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Agricultural biotechnology
Research Field:Genetically modified field crops and pasture
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Mitigation of climate change
Objective Field:Climate change mitigation strategies
UTAS Author:Harrison, MT (Associate Professor Matthew Harrison)
UTAS Author:Liu, K (Mr Ke Liu)
ID Code:148821
Year Published:In Press
Deposited By:TIA - Research Institute
Deposited On:2022-02-14
Last Modified:2022-03-04
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