Genetic Variabilty for Resistance to Propanil Injury in Soybeans
1979
Karazawa, Missae | Caviness, C. E.
Propanil (3′4′-dichloropropionanilide) is applied by aircraft to rice [Oryza sativa (L.)] for weed control, therefore, injury from spray drift of this herbicide frequently occurs on plants in nearby soybean [Glycine max (L.) Merr.] fields. Severity of injury from drift has been shown to vary among soybean cultivars. We studied genetic variability for resistance to a drift rate in crosses between resistant ✕ resistant, susceptible ✕ resistant, and susceptible ✕ susceptible parents. Mean scores for F₁ populations from crosses between susceptible ✕ resistant parents indicated partial dominance for resistance to propanil injury. It was not possible from the data to determine the actual number of genes responsible for this trait, but F₂ distributions indicated a relatively small number was involved. Broad sense heritability estimates ranged from 38 to 50% in crosses involving susceptible ✕ resistant parents to near zero for crosses between susceptible ✕ susceptible and resistant ✕ resistant parents.
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