Inheritance of 2,4-D resistance traits in multiple herbicide- resistant Raphanus raphanistrum populations

- In Raphanus raphanistrum 2,4-D resistance segregates at one locus.
- 2,4-D resistance is highly dominant in F1 plants.
- 2,4-D resistance is not associated to ALS resistance.
- The inheritance of 2,4-D resistance is consistent with its physiological basis.

A relatively low number of weed species have evolved resistance to auxinic herbicides despite their use for almost 70 years. This inheritance study with two Raphanus raphanistrum populations multiple-resistant 2,4-D and the ALS-inhibiting herbicide chlorsulfuron determined the number of genes and genetic dominance of 2,4-D resistance and investigated the association between traits conferring resistance to the two herbicide modes of action. Levels of 2,4-D phenotypic resistance and resistance segregation patterns were assessed in parental populations, F1 and F2 families.