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Influence of Sugarcane Mosaic Virus on Segregation for Two Seedling Characteristics in Sorghum

USDA-ARS, Beltsville Agric. Res. Center, Beltsville, MD 20705

A. G. Gillaspie, Jr.

Regional Plant Introduction Stn., Experiment, GA 30212

^* Corresponding author.

Sorghum (Sorghum bicolor L., Moench) yields are reduced in many areas by the sugarcane mosaic virus. Losses from pathological effects of the virus have been documented; information about genetic effects could lead to improved production practices and more efficient breeding programs. Our objectives were to determine whether the sugarcane mosaic virus strain A (SCMV-A) in one of the parent plants of a sorghum cross could influence segregation for seedling color and ligule expression in later generations, and whether segregation of this type could be detected and evaluated by phenotypic observations. In tests under greenhouse conditions, deviations in segregation of four phenotypes in F₂ populations of reciprocal control crosses were not significant. Segregation of F₂ plants into four phenotypes in control and treated (T) (one virus-infected parent) populations was significantly different from expected ratios in the cross ‘Planter’ (T) x ‘MN4611’, at the 5% level, and at the 1% level in Planter x MN 4611 (T). Deviations in distribution of nine F₂ genotypes within treated populations, observed in F₃ seedlings, of the cross Planter x MN 4611, were significant at the 5% level and in MN 4611 x Planter at the 1% level. Also, deviations in distribution of F₂ genotypes from expected ratios in populations from control and treated crosses, were significant at the 1% level in MN 4611 x Planter. Although SCMV-A in one of the parent plants did not produce recognizable virus symptoms in F₁, F₂, or F₃ populations; it was associated with deviations of F₂ genotypes from expected ratios.

Key Words: Genetic variation • Sorghum bicolor (L.) Moench • Inheritance • Long-time influence

Received for publication May 1, 1987.