Association between field and laboratory predictors of drought tolerance in wheat disomic addition lines

摘要

To locate quantitative trait loci (QTLs) controlling field and laboratory indicators of drought tolerance, chromosome addition lines of Agropyron elongatum [Elymus elongatus] (donor) in the genetic background of Triticum aestivum cv. Chinese Spring(recipient) were tested in the field and laboratory of the College of Agriculture, Razi University, Kermanshah, Iran. The plant genetic material was cultivated in the field and laboratory under two different water regimes (irrigated and non-irrigated). High significant differences were found for promptness index (PI), coleoptile length and root length under stress and non-stress conditions, indicating the presence of genetic variation and the possibility of selection for these traits. High correlation coefficients were found between PI, germination stress index and stress tolerance index, displaying a high association between the indices of field and laboratory predictors of drought tolerance. Field and laboratory predictors of drought tolerance showedthat most of the QTLs controlling drought tolerance criteria in Agropyron are located on chromosomes 3E, 5E and 7E, which collectively constitute 84.3% of the additive genetic variance.