Genome-wide quantitative trait loci reveal the genetic basis of cotton fibre quality and yield-related traits in a Gossypium hirsutum recombinant inbred line population.

Through detailed analysis of these results, we found that when paired traits had a medium or high significant positive correlation, the QTL additive effect directions for these two traits were the same (positive or negative) in most QTL clusters (Diouf et al ., 2018 ; Liu et al ., 2017 ; Tan et al ., 2018 ) (Table S21 ); when paired traits had a medium or high significant negative correlation, the QTL additive effect directions for these two traits were opposite (positive and negative) in most of the QTL clusters (Liu et al ., 2017 ); and when paired traits had no or only a weakly significant correlation, the QTL additive effect directions for these two traits were sometimes the same and sometimes opposite (Liu et al ., 2017 ; Tan et al ., 2018 ).

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