Year 2016, Volume 62, Issue 3

Year : 2016
Volume : 62
Issue : 3
   
Authors : Reza MOHAMMADI, Abdolvahab ABDULAHI
Title : SELECTION FOR TRAITS ASSOCIATED WITH DROUGHT TOLERANCE IN DURUM WHEAT
Abstract : This study was conducted to evaluate the 22 durum wheat genotypes based on morphological, phenological and physiological traits, to determine trait relations with yield in different levels of drought stress; and to assess their potential use in breeding for drought tolerance in durum wheat. The genotypes were evaluated in three cropping seasons (2008-11) under rainfed conditions, which the variation in the annual rainfall was provided a range of drought scenarios in durum wheat trials. The measured traits included grain yield (GY), plant height (PH), peduncle length (PL), flag-leaf length (FL), spike length (SL), days to heading (DH), days to maturity (DM), harvest index (HI), 1000-kernel weight (TKW), number of seeds per spike (NSPS), relative water content (RWC), relative water loss (RWL) and chlorophyll content (SPAD reading). Based on the results drought tolerant genotypes were characterized for higher TKW, HI, SPAD, PH and PL/PH and lower DH, RWL, DM and SL. Stepwise regression analysis indicated that PH, RWC, RWL and short grain filling period could be instrumental in predicting the drought tolerance of durum wheat genotypes. In conclusion, relative estimates of genotypes response to drought couldn’t be obtained in a single growing season in Mediterranean conditions i.e., Kermanshah region in west of Iran, and the effect of drought depends on the severity, frequency and duration of stress.
For citation : Mohammadi, R., Abdulahi, A. (2016): Selection for traits associated with drought tolerance in durum wheat. Agriculture and Forestry, 62 (3): 139-150. DOI:10.17707/AgricultForest.62.3.12
Keywords : durum wheat, drought stress, regression analysis, trait selection.
   
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ISSN 0554-5579 (Printed)
ISSN 1800-9492 (Online)
DOI : 10.17707/AgricultForest

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