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

OAR@ICRISAT

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Relation http://oar.icrisat.org/1228/
http://dx.doi.org/10.1071/FP10224
 
Title Does susceptibility to heat stress confound screening
for drought tolerance in rice?
 
Creator Jagadish, S V K
Cairns, J E
Kumar, Arvind
Somayanda, I M
Craufurd, P Q
 
Subject Agriculture-Farming, Production, Technology, Economics
 
Description 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.
 
Publisher CSIRO Publishing
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/1228/1/FunctionalPlantBiology38_261-269_2011.pdf
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