The inheritance of glyphosate-resistant goosegrass was studied by making reciprocal crosses between resistant (R) and susceptible (S) biotypes. Eighty-four F1hybrids were confirmed using isozyme analyses. Reciprocal F1hybrids displayed uniform levels of resistance intermediate (I) to that of the parental types, with no indication of maternal inheritance. The F1hybrids were selfed to produce F2populations. F3populations were produced by selfing resistant and intermediate F2phenotypes. A segregation ratio of 1:2:1 (S:I:R) was observed in the F2and subsequently in the F3generations derived from selfing intermediate F2phenotypes. Individuals in F3families derived from selfing resistant F2phenotypes were resistant. Results from the present study show that glyphosate resistance in goosegrass is inherited as a single, nuclear, and incompletely dominant gene.
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Ng et al. (2004) studied this question.
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