Genotypic performance under intermittent and terminal drought screening in rainfed lowland rice

Xangsayasane, P., Jongdee, B., Pantuwan, G., Fukai, S., Mitchell, J. H., Inthapanya, P. and Jothiyangkoon, D. (2014) Genotypic performance under intermittent and terminal drought screening in rainfed lowland rice. Field Crops Research, 156 281-292. doi:10.1016/j.fcr.2013.10.017

Author Xangsayasane, P.
Jongdee, B.
Pantuwan, G.
Fukai, S.
Mitchell, J. H.
Inthapanya, P.
Jothiyangkoon, D.
Title Genotypic performance under intermittent and terminal drought screening in rainfed lowland rice
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
Publication date 2014-02-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.fcr.2013.10.017
Open Access Status Not yet assessed
Volume 156
Start page 281
End page 292
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 1102 Agronomy and Crop Science
1111 Soil Science
Abstract Drought is a major constraint to rice production in the rainfed lowlands of South East Asia. The timing and severity of water stress is highly variable from year to year and the current drought screening method for rainfed lowland rice utilizes a late planting to impose a prolonged terminal drought in the wet season. In this paper, an alternative drought screening method was investigated for areas where photoperiod insensitive genotypes are commonly grown with the aim of identifying promising genotypes exposed to short-duration intermittent drought, a condition that is more frequently experienced in the rainfed lowlands in the wet season. To assess the usefulness of intermittent drought screening the performance of genotypes was compared with that tested under traditional flooded and terminal drought treatments in wet and dry seasons for two years. Mean yield reduction in intermittent and terminal drought was 13 and 35% respectively in the wet season and 34 and 59% respectively in the dry season, indicating that the proposed intermittent drought screening in the dry season and the current terminal drought screening in wet season would provide the magnitude of drought severity that would be appropriate for screening. Genotypes shown to be drought tolerant, based on their drought response index (DRI), were consistent in intermittent and terminal drought screening. There was no significant relationship between potential grain yield obtained under well watered treatments and DRI, indicating that some drought tolerant genotypes can achieve high yield, thus adaptation to a wide range of rainfed lowland conditions is expected. Due to genotypic variation in flowering in relation to rainfall or irrigation events in the terminal and intermittent drought treatments respectively, delay in flowering was not consistent across experiments and thus, is not expected to be a useful trait for selection particularly when using intermittent screening methods. It is therefore concluded that intermittent drought with appropriate level of drought stress could be used with DRI as a criterion for selection of well adapted genotypes suitable for the rainfed lowlands.
Keyword Aerobic conditions
Delay in flowering
Drought response index
Drought tolerance
Potential yield
Water deficit
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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