Abstract
Cadmium (Cd) is a toxic heavy metal which has been threatening food security worldwide. In the present study, two sets of reciprocal introgression lines were used to dissect the genetic basis of Cd tolerance at seedling stage. Although the two parents had no significantly difference on Cd tolerance, the introgression progenies showed large variations. A total of 15 main-QTL (M-QTL) and 53 digenic epistatic QTL pairs (E-QTL) were detected for plant height, leaf length, leaf width and root length under Cd stress condition, each explaining 2.48-31.55% of phenotypic variations. E-QTL had larger effects than M-QTL for most traits, suggesting that E-QTL was the main genetic component for Cd tolerance at seedling stage. No common QTL, either M-QTL or E-QTL, was identified independent of background, indicated that both M-QTL and E-QTL were highly sensitive to genetic background. Two pleiotropic QTL in the regions of 13.31-15.56 Mb on chromosome 2 and 7.34-7.59 Mb on chromosome 11 were detected in the two backgrounds respectively, and further validated their effects on three traits by two introgression lines, indicated that they were both genetic true. Our results will give valuable QTL for improving Cd tolerance at seedling stage by molecular breeding.
Xianjin Qiu. (2021) IDENTIFICATION OF QTL UNDERLYING CADMIUM TOLERANCE AT SEEDLING STAGE USING TWO SETS OF RECIPROCAL INTROGRESSION LINES IN RICE, Pakistan Journal of Agricultural Sciences, Volume 58, Issue 3.
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