Superweeds may arise due to transfer of genes conferring:
Superweeds describe weedy populations that have acquired herbicide resistance via gene flow from cultivated crops, making control challenging. When transgenic crop expressing bar gene for glufosinate tolerance or cp4-epsps for glyphosate tolerance cross-pollinates with sexually compatible weed such as Brassica rapa, hybrid offspring inherit resistance allowing survival under herbicide application. Repeated selection in fields sprayed with same herbicide enriches resistant allele frequency, and backcrossing to weed parent restores weediness while retaining transgene. Documented cases include gl
Ref: Snow Am J Bot 1997 superweeds; Ellstrand Bioscience 2001; NCBI NBK131103; ISAAA superweed brief 2020; https://www.isaaa.org/
