Journal
NEW ZEALAND JOURNAL OF CROP AND HORTICULTURAL SCIENCE
Volume 46, Issue 4, Pages 346-353Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/01140671.2018.1449124
Keywords
Glyphosate resistance; inheritance; Italian ryegrass; nuclear genome; one-gene
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The mode of inheritance for herbicide resistance was investigated in a population of Lolium multiflorum (Italian ryegrass) with restricted glyphosate translocation mechanism of resistance. The degree of dominance for glyphosate resistance in Italian ryegrass was evaluated in the progenies of F1 families which were created by reciprocal-crossing between resistant (R) and susceptible (S) parental individuals. The results showed an intermediate level of glyphosate resistance for F1 families compared to that of the parental types. The phenotypic resistance segregation was also investigated using backcross families which were created by pair-crossing the F1 individuals to the susceptible population, and the observed segregation values fitted a one-gene model very well. Thus it appears that glyphosate resistance in the Italian ryegrass obtained from a New Zealand vineyard with restricted herbicide translocation is controlled by a single incompletely dominant nuclear gene.
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