| In order to provide reference for drought resistance gene cloning and marker assisted selection,QTL(quantitative trait locus) analysis was carried out in wheat under PEG-6000 treatment using 184 RILs(recombinant inbred lines) derived from a cross of Tainong 18×Linmai 6.The results showed that a total of 43 QTLs were located on 14 chromosomes except for 1B,3D，4D,5A,5D,6D and 7A.Of these,5,5,9,3,6,1,3,3 and 3 QTLs were related to shoot hight,maximum root length,root number,shoot fresh weight,root fresh weight,shoot dry weight,root dry weight,root-shoot ratio in fresh weight,root-shoot ratio in dry weight,respectively; and 5 QTLs were related to drought resistance coefficient.A single QTL accounted for 3.39 to 32.63% of the phenotypic variation.Twenty-eight QTLs showed positive additive effects,indicating that Tainong 18 increased the effects of QTLs; whereas 30 QTLs showed negative additive effects,indicating that Linmai 6 increased the effects of QTLs.A number of 11 RHF-QTLs( relative high frequency QTLs) were detected in two or more environments.One QTL cluster was detected on chromosome 4B,including four morphological traits(shoot hight,shoot fresh weight,shoot dry weight,and root-shoot ratio in fresh weight) of RHF-QTLs( QSh-4B-1, QSfw-4B-1, QSdw-4B-1, QRsfw-4B-1) and one drought resistance coefficient QTL( QRsfw-D-4B-1).The contribution rates of the five QTLs were all over 10%.The markers of this QTL cluster can be used for marker assisted selection. |
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