Screening Strategy for Maintaining Purity and Seed Quality in Cotton Breeding Nurseries

A screening method is being developed to accurately phenotype glyphosate resistant transgenic cotton plants in conventional cotton breeding nurseries.  Broadcast glyphosate applications were made to induce herbicide damage symptoms in non-resistant plants to distinguish from resistant plants. Two glyphosate rates were evaluated at three different timings to identify resistant plants and potential subsequent impacts on harvested cotton seed viability.