Abstract: Seedling height and taproot length are important indexes to evaluate salt tolerance of wheat(Triticum?aestivum L． )seedlings． For mapping quantitative trait loci(QTLs)for seedling height(SH) and taproot length(TL)?in wheat，a set of 168 doubled haploid(DH)lines derived from the cross between Huapei 3 and Yumai 57 was treated with deionized water(normal condition) and 50，100，200 mmol/L of NaCl． Based on inclusive composite interval mapping(ICIM)method，we identified 25 additive QTLs for seedling height and taproot length under normal and?the three stress conditions． Each locus explained 4． 19% －23． 72% of phenotypic variance． In the interval between?Xgdm72 and Xbarc1119 on chromosome 3D，QTL qTL3D-2 had the phenotypic contribution of 23． 72%． Another?QTL qSH2D located between Xwmc170． 2 and Xgwm539 on chromosome 2D was detected in both 100 and 50?mmol/LNaCl treatments，which explained phenotypic variances of 12． 59% and 8． 40%． QTL located between Xcfa2173 and Xcfe188 on chromosome 4D was detected in both 100 and 200 mmol/L NaCl treatments，which explained phenotypic variances of 8． 77% and 5． 70%． QTL for SH located between Xgwm213 and Xswes861． 2 on chromosome 5BL was detected in both normal and 100 mmol/L NaCl treatments，which explained phenotypic variances of 12. 59%and 8． 40%． In addition，QTL for SH located between Xwmc657 and Xwmc48 on chromosome 4B?was detected in 50 mmol/L NaCl treatments，which explained phenotypic variances of 12． 59%． In the linkage?groups 3A and 7D，one and one QTL associated with TL were detected respectively． On chromosome 5A，one QTL?for SH was found in the interval between Xbarc358． 2 and Xgwm186 and the interval between Xcwem40 and?Xbarc358． 2，respectively． The major QTLs identified can be applicable in marker-assisted selection in wheat breeding for seedling height and taproot length．

Key words: Wheat, DH population, Seedling height, Taproot length, Quantitative trait locus

CLC Number: 

• S512.03