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Recurrent Selection for Shifting Gene Frequency of Seed Weight in Panicum antidotale Retz.¹

Effectiveness of recurrent phenotypic selection with restricted intercrossing by random mating through succeeding cycles to isolate genotypes of heavy and light seed weight of blue panicgrass, Panicum antidotale Retz., was investigated. Increased frequency of desired genotypes and isolation of separate genepools for extremes of seed weight were effected. Most effective estimate of selection intensity was calculated as the difference between mean of resource populations and mean of sample populations. Frequency of resource populations showed trimodal distribution. Bimodal frequency distributions were found for first four cycles of sample populations of light seed weight. Monodal frequency distributions were found for sample populations of heavy seed weight. Sixth cycle frequency distributions showed that sample populations of heavy and light seed weight were separated. Findings suggested that the biological limit was approximately 38.0 mg/100 seed for light seed weight and 135.0 mg/100 seed for heavy seed weight of plants selected from the resource populations investigated.

Key Words: Frequency distribution • Variability • Gene pool • Seed weight

² Research leader, ARS-USDA; and professor, Dep. of Plant Sciences, Univ. of Arizona, Tucson, AZ 85721.

Received for publication September 20, 1975.