Genetic Variabilty for Resistance to Propanil Injury in Soybeans1
- Missae Karazawa and
- C. E. Caviness2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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