Different nontarget-site mechanisms underlie resistance to dicamba and 2,4-D in an Amaranthus tuberculatus population.

ABSTRACT:

Background

Amaranthus tuberculatus (Moq.) Sauer (waterhemp) has emerged as one of several weed species that is resistant to synthetic auxin herbicides (SAHs). Among the mechanisms of resistance to SAHs, nontarget-site resistance (NTSR) has been of particular concern owing to its complexity. Here, we integrated linkage mapping with transcriptome analysis to explore NTSR mechanisms to two SAHs, dicamba and 2,4-D, in a multiple-herbicide-resistant A. tuberculatus population (CHR).

Results

Phenotypic evaluations of an F₂ mapping population indicated a polygenic basis for both dicamba and 2,4-D resistance in CHR. A weak correlation was observed between phenotypic responses to dicamba and 2,4-D treatments. Linkage mapping analyses revealed eight quantitative trait loci

SUBMITTER: Werle IS 

PROVIDER: S-EPMC12159393 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature