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Research paper | Open Access

Quantifying the effects of short-term heat stress at booting stage on nonstructural carbohydrates remobilization in rice

Fengxian Zhen, Junjie Zhou, Aqib Mahmood, Wei Wang, Xini Chang, Bing Liu, Leilei Liu, Weixing Cao, Yan Zhu( ), Liang Tang( )
National Engineering and Technology Center for Information Agriculture, Key Laboratory for Crop System Analysis and Decision Making, Ministry of Agriculture and Rural Affairs of the People’s Republic of China, Jiangsu Key Laboratory for Information Agriculture, Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China

Peer review under responsibility of Crop Science Society of China and Institute of Crop Science, CAAS.

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Abstract

Extreme heat stress events are becoming more frequent under anticipated climate change, which can have devastating impacts on rice growth and yield. To quantify the effects of short-term heat stress at booting stage on nonstructural carbohydrates (NSC) remobilization in rice, two varieties (Nanjing 41 and Wuyunjing 24) were subjected to 32/22/27 ℃ (maximum/minimum/mean), 36/26/31 ℃, 40/30/35 ℃, and 44/34/39 ℃ for 2, 4 and 6 days in phytotrons at booting stage during 2014 and 2015. Yield and yield components, dry matter partitioning index (DMPI), NSC accumulation and translocation were measured and calculated. The results showed that the increase of high-temperature level and duration significantly reduced grain yield by suppressing spikelet number per panicle, seed-setting rate, and grain weight. Heat stress at booting decreased DMPI in panicles, increased DMPI in stems, but had no significant effect on photosynthetic rate. Stem NSC concentration increased whereas panicles NSC concentration, stem NSC translocation efficiency, and contribution of stem NSC to grain yield decreased. Severe heat stress even transformed the stem into a carbohydrate sink during grain filling. The heat-tolerant Wuyunjing 24 showed a higher NSC transport capacity under heat stress than the heat-sensitive Nanjing 41. Heat degree-days (HDD), which combines the effects of the intensity and duration of heat stress, used for quantifying the impacts of heat stress indicates the threshold HDD for the termination of NSC translocation is 9.82 ℃ day. Grain yield was negatively correlated with stem NSC concentration and accumulation at maturity, and yield reduction was tightly related to NSC translocation reduction. The results suggest that heat stress at booting inhibits NSC translocation due to sink size reduction. Therefore, genotypes with higher NSC transport capacity under heat stress could be beneficial for rice yield formation.

Keywords

Rice (Oryza sativa L.)Heat stressYield componentsNonstructural carbohydratesTranslocation

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The Crop Journal
Volume 8 Issue 2,
April 2020
Pages 194-212
DOI: 10.1016/j.cj.2019.07.002
Cite this article:
Zhen F, Zhou J, Mahmood A, et al. Quantifying the effects of short-term heat stress at booting stage on nonstructural carbohydrates remobilization in rice. The Crop Journal, 2020, 8(2): 194-212. https://doi.org/10.1016/j.cj.2019.07.002

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Received: 12 March 2019
Revised: 29 July 2019
Accepted: 04 September 2019
Published: 23 October 2019
© 2019 Crop Science Society of China and Institute of Crop Science, CAAS.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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