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Genetic Variabilty for Resistance to Propanil Injury in Soybeans¹

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 x resistant, susceptible x resistant, and susceptible x susceptible parents. Mean scores for F₁ populations from crosses between susceptible x 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 x resistant parents to near zero for crosses between susceptible x susceptible and resistant x resistant parents.

Key Words: Glycine max (L.) Merr. • Herbicide injury • Heritability • Soybean breeding

² Formerly graduate student (now research associate, Fundacao Instituto Agronomcio Do. Parana, Brazil) and professor of agronomy, Univ. of Arkansas, Fayetteville, AR 72701.

Received for publication June 26, 1978.