Does susceptibility to heat stress confound screening for drought tolerance in rice?

Jagadish, S V K and Cairns, J E and Kumar, Arvind and Somayanda, I M and Craufurd, P Q (2011) Does susceptibility to heat stress confound screening for drought tolerance in rice? Functional Plant Biology, 38 (4). pp. 261-269. ISSN 1445-4408

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Drought affected rice areas are predicted to double by the end of this century, demanding greater tolerance in widely adapted mega-varieties. Progress on incorporating better drought tolerance has been slow due to lack of appropriate phenotyping protocols. Furthermore, existing protocols do not consider the effect of drought and heat interactions, especially during the critical flowering stage, which could lead to false conclusion about drought tolerance. Screening germplasm and mapping-populations to identify quantitative trait loci (QTL)/candidate genes for drought tolerance is usually conducted in hot dry seasons where water supply can be controlled. Hence, results from dry season drought screening in the field could be confounded by heat stress, either directly on heat sensitive processes such as pollination or indirectly by raising tissue temperature through reducing transpirational cooling under water deficit conditions. Drought-tolerant entries or droughtresponsive candidate genes/QTL identified from germplasm highly susceptible to heat stress during anthesis/flowering have to be interpreted with caution. During drought screening, germplasm tolerant to water stress but highly susceptible to heat stress has to be excluded during dry and hot season screening. Responses to drought and heat stress in rice are compared and results from field and controlled environment experiments studying drought and heat tolerance and their interaction are discussed.

Item Type: Article
Uncontrolled Keywords: flowering, heat, spikelet fertility, tissue temperature
Subjects: Others > Agriculture-Farming, Production, Technology, Economics
Depositing User: Users 6 not found.
Date Deposited: 09 Sep 2011 08:52
Last Modified: 09 Sep 2011 08:52
Official URL:
Funders: University of Reading
Acknowledgement: The first author was financially supported by Felix Scholarship, University of Reading for his doctoral studies. The authors are also grateful for the support of grants from the Bill and Melinda Gates Foundation, USAID (CSISA), and Rockefeller Foundation grant to Indira Gandhi Krishi Viswavidyalaya, Raipur, India. We thank Dr Renee Lafitte, Flor Adrian Simborio, and Grace Centeno for valuable assistance. Drs Abdelbagi Ismail, Horgan Finbarr from IRRI and Dr Vincent Vadez from ICRISAT are thanked for their comments on the manuscript. Bill Hardy is thanked for editing the manuscript.
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