Analysis of multiple-herbicide resistant Amaranthus palmeri populations from Spain points to an introduction of the eccDNA from America.

ABSTRACT:

Background

The herbicide-resistant invasive weed species Amaranthus palmeri threatens agricultural production and native plant ecology in Spain, as well as in other European countries. Understanding whether herbicide resistance alleles evolve in situ or are introduced via gene flow remains unclear. To address this, we characterized multiple resistance to acetolactate synthase (ALS)-- and 5-enolpyruvylshikimate-3phosphate synthase (EPSPS)-inhibiting herbicides in two Spanish A. palmeri populations at the plant level. Additionally, we analyzed the extra-chromosomal circular DNA (eccDNA) to determine whether glyphosate resistance resulted from local selection pressure or was introduced by gene flow.

Results

Both populations exhibit individuals that survived both herbicide MoA,

SUBMITTER: Manicardi A 

PROVIDER: S-EPMC12441762 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature