Inheritance of glyphosate resistance in goosegrass (<i>Eleusine indica</i>)

Abstract

The inheritance of glyphosate-resistant goosegrass was studied by making reciprocal crosses between resistant (R) and susceptible (S) biotypes. Eighty-four F 1 hybrids were confirmed using isozyme analyses. Reciprocal F 1 hybrids displayed uniform levels of resistance intermediate (I) to that of the parental types, with no indication of maternal inheritance. The F 1 hybrids were selfed to produce F 2 populations. F 3 populations were produced by selfing resistant and intermediate F 2 phenotypes. A segregation ratio of 1:2:1 (S:I:R) was observed in the F 2 and subsequently in the F 3 generations derived from selfing intermediate F 2 phenotypes. Individuals in F 3 families derived from selfing resistant F 2 phenotypes were resistant. Results from the present study show that glyphosate resistance in goosegrass is inherited as a single, nuclear, and incompletely dominant gene.