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

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Title Does susceptibility to heat stress confound screening for drought tolerance in rice?
 
Creator Jagadish, Krishna S.V.
Cairns, Jill E.
Kumar, Arvind
Somayanda, Impa M.
Craufurd, Peter Q.
 
Subject agriculture
climate
rice
drought tolerance
 
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 drought-responsive 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.
 
Date 2011
2014-08-15T12:13:11Z
2014-08-15T12:13:11Z
 
Type Journal Article
 
Identifier Jagadish SVK, Cairns JE, Kumar A, Somayanda IM, Craufurd PQ. 2011. Does susceptibility to heat stress confound screening for drought tolerance in rice? Functional Plant Biology 38 (4), 261-269.
https://hdl.handle.net/10568/41941
https://doi.org/10.1071/FP10224
 
Language en
 
Rights Limited Access
 
Format p. 261-269
 
Publisher CSIRO Publishing
 
Source Functional Plant Biology