Content area
Full Text
Euphytica (2012) 186:233245 DOI 10.1007/s10681-012-0647-7
Mapping QTLs with epistatic effects and QTL 3 treatment interactions for salt tolerance at seedling stage of wheat
Yun-Feng Xu Diao-Guo An Dong-Cheng Liu
Ai-Min Zhang Hong-Xing Xu Bin Li
Received: 28 November 2011 / Accepted: 16 February 2012 / Published online: 29 February 2012 Springer Science+Business Media B.V. 2012
Abstract Quantitative trait loci (QTLs) with additive (a), additive 9 additive (aa) epistatic effects, and their treatmental interactions (at and aat) were studied under salt stress and normal conditions at seedling stage of wheat (Triticum aestivum L.). A set of 182 recombinant inbred lines (RILs) derived from cross Xiaoyan 54 9 Jing 411 were used. A total of 29 additive QTLs and 17 epistasis were detected for 12 traits examined, among which eight and seven, respectively, were identied to have QTL 9 treatment effects. Physiological traits rather than biomass traits were more likely to be involved in QTL 9 treatment interactions. Ten intervals on chromosomes 1A, 1D, 2A (two), 2D, 3B, 4B, 5A, 5B and 7D showed overlapping QTLs for different traits; some of them represent a single locus affecting different traits and/or the same trait under both treatments. Eleven pairs of QTLs were detected on seemingly homoeologous positions of six chromosome groups of wheat, showing synteny among the A, B and D genomes. Ten pairs
were detected in which each pair was contributed by the same parent, indicating a strong genetic plasticity of the QTLs. The results are helpful for understanding the genetic basis of salt tolerance in wheat and provide useful information for genetic improvement of salt tolerance in wheat by marker-assisted selection.
Keywords Epistasis QTL 9 treatment Salt
tolerance Quantitative trait locus (QTL) Wheat
AbbreviationsCHL Chlorophyll content (SPAD value) MAS Marker-assisted selectionN Normal water treatmentQTL Quantitative trait locusQ 9 E QTL 9 environmentQ 9 T QTL 9 treatmenta Additiveaa Additive 9 additiveat Additive 9 treatmentaat Epistasis 9 treatmentRDW Root dry weightRIL Recombinant inbred lineRKC Root K? concentrationRKN Root K?/Na? concentration ratio RL Root lengthRNC Root Na? concentrationS Salt stress treatmentSDW Shoot dry weightSH Shoot heightSII Salt injury index
Y.-F. Xu D.-G. An (&) H.-X. Xu
Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academyof Sciences, Shijiazhuang 050021,...
