Evolved polygenic herbicide resistance in Lolium rigidum by low-dose herbicide selection within standing genetic variation.

ABSTRACT: The interaction between environment and genetic traits under selection is the basis of evolution. In this study, we have investigated the genetic basis of herbicide resistance in a highly characterized initially herbicide-susceptible Lolium rigidum population recurrently selected with low (below recommended label) doses of the herbicide diclofop-methyl. We report the variability in herbicide resistance levels observed in F1 families and the segregation of resistance observed in F2 and back-cross (BC) families. The selected herbicide resistance phenotypic trait(s) appear to be under complex polygenic control. The estimation of the effective minimum number of genes (N E), depending on the herbicide dose used, reveals at least three resistance genes had been enriched. A joint scaling test ind

SUBMITTER: Busi R 

PROVIDER: S-EPMC3689349 | biostudies-literature | 2013 Feb

REPOSITORIES: biostudies-literature