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In order to mine gene loci associated with drought resistance and water use efficiency,and provide guidance for the breeding of drought-resistant wheat varieties,quantitative trait loci(QTLs)for plant height(PH)and stem height(SH)of wheat were evaluated using a population of 302 recombinant inbred lines(RILs)derived from a cross between drought-tolerant cultivar Luohan 2 and water-sensitive cultivar Weimai 8 under different water regimes in six environments.Totally 17 additive QTLs for PH and SH were identified and distributed on chromosomes 2B,3A,3B,4A,5A,5D,6B,7A and 7B,respectively,which explained3.3%to 26.95%phenotypic variations,with additive effect of 1.919 6 to 5.382 8 cm.Among them,14 QTLs,24 times and 5 QTLs,7 times were detected in three irrigation environments and three drought stress environments,respectively.Both the number of QTLs for PH and the times detected in drought stress environments were significantly less than those in irrigation environments.Of all the 17 QTLs for PH,12 were detected only in irrigation environment,three QTLs were detected only in drought stress environment,and two QTLs were detected in both environments,suggesting that the expression of the genes is greatly influenced by environmental condition.QPh-WL-7A.3 detected between maker Xbarc049 and Xgwm273 on chromosome 7A in all the three drought stress environments,can enhance2.481 5-3.697 2 cm of PH,explain 8.6%-10.0%additive effect,so it is useful for the genetic improvement of drought tolerance and molecular marker-assisted selection in wheat.
In order to mine gene loci associated with drought resistance and water use efficiency, and provide guidance for the breeding of drought-resistant wheat varieties, quantitative trait loci (QTLs) for plant height (PH) and stem height (SH) of wheat were using a population of 302 recombinant in lines (RILs) derived from a cross between drought-tolerant cultivar Luohan 2 and water-sensitive cultivar Weimai 8 under different water regimes in six environments. Totally 17 additive QTLs for PH and SH were identified and distributed on chromosomes 2B, 3A, 3B, 4A, 5A, 5D, 6B, 7A and 7B, respectively explained 3. 3% to 26.95% phenotypic variations, with additive effect of 1.919 6 to 5.382 8 cm. Among them, 14 QTLs, 24 times and 5 QTLs, 7 times were detected in three irrigation environments and three drought stress environments, respectively. Both the number of QTLs for PH and the times detected in drought stress environments were significantly less than those in irrigation environments. Of all the 17 QTLs f or PH, 12 were detected only in irrigation environment, three QTLs were detected only in drought stress environment, and two QTLs were detected in both environments, suggesting that the expression of the genes is greatly influenced by environmental conditions. QPh-WL-7A. 3 detected between maker Xbarc049 and Xgwm273 on chromosome 7A in all the three drought stress environments, can enhance 2.481 5-3.697 2 cm of PH, explain 8.6% -10.0% additive effect, so it is useful for the genetic improvement of drought tolerance and molecular marker-assisted selection in wheat.