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Impact of high-temperature stress on rice plant and its traits related to tolerance

Published online by Cambridge University Press:  27 April 2011

F. SHAH ,
J. HUANG ,
K. CUI ,
L. NIE ,
T. SHAH ,
C. CHEN  and
K. WANG
F. SHAH
Affiliation:
MOA Key Laboratory of Crop Physiology, Ecology and Production, Huazhong Agricultural University, Wuhan 430070, China
J. HUANG*
Affiliation:
MOA Key Laboratory of Crop Physiology, Ecology and Production, Huazhong Agricultural University, Wuhan 430070, China
K. CUI
Affiliation:
MOA Key Laboratory of Crop Physiology, Ecology and Production, Huazhong Agricultural University, Wuhan 430070, China
L. NIE
Affiliation:
MOA Key Laboratory of Crop Physiology, Ecology and Production, Huazhong Agricultural University, Wuhan 430070, China
T. SHAH
Affiliation:
Department of Extension Education and Communication, Faculty of Rural Social Sciences, NWFP Agricultural University, Peshawar 25000, Pakistan
C. CHEN
Affiliation:
MOA Key Laboratory of Crop Physiology, Ecology and Production, Huazhong Agricultural University, Wuhan 430070, China
K. WANG
Affiliation:
MOA Key Laboratory of Crop Physiology, Ecology and Production, Huazhong Agricultural University, Wuhan 430070, China
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

The predicted 2–4°C increment in temperature by the end of the 21st Century poses a threat to rice production. The impact of high temperatures at night is more devastating than day-time or mean daily temperatures. Booting and flowering are the stages most sensitive to high temperature, which may sometimes lead to complete sterility. Humidity also plays a vital role in increasing the spikelet sterility at increased temperature. Significant variation exists among rice germplasms in response to temperature stress. Flowering at cooler times of day, more pollen viability, larger anthers, longer basal dehiscence and presence of long basal pores are some of the phenotypic markers for high-temperature tolerance. Protection of structural proteins, enzymes and membranes and expression of heat shock proteins (HSPs) are some of the biochemical processes that can impart thermo-tolerance. All these traits should be actively exploited in future breeding programmes for developing heat-resistant cultivars. Replacement of heat-sensitive cultivars with heat-tolerant ones, adjustment of sowing time, choice of varieties with a growth duration allowing avoidance of peak stress periods, and exogenous application of plant hormones are some of the adaptive measures that will help in the mitigation of forecast yield reduction due to global warming.

Type
Climate Change and Agriculture
Information
The Journal of Agricultural Science , Volume 149 , Issue 5 , October 2011 , pp. 545 - 556
Copyright
Copyright © Cambridge University Press 2011

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