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Parent-Offspring Relationships in Kleingrass, Panicum coloratum L.¹

Kleingrass (Panicum coloratum L.), a recently introduced warm season, perennial bunchgrass, has many characteristics which are desirable in a forage grass. The relationship among and the variability in six agronomic characteristics of kleingrass were determined by the performance of both selfed ($1) and open-pollinated (O.P.) progeny. Considerable genetic variation was apparent among the 42 parental clones, based on the performance of both types of progeny. "Broad sense" heritability estimates were similar regardless of the kind of progeny used for making these estimates. The "narrow sense" estimates, using the parent-offspring regression method and based on S₁ progeny, indicated that the additive portion of genetic variance was limited. The same estimates based on O.P. progeny were 50 to 80% higher, indicating that considerable inbreeding took place in the parental plants of this reportedly cross-pollinated species. The results of this study strongly support the theory that adjustment for inbreeding must be made to obtain accurate heritability estimates regardless of the species studied or the breeding system involved, symbolically h² = b/2r_xy.

² Formerly Research Assistant (now Associate Agronomist, Mississippi State University); and Professor of Agronomy, Texas A & M University.

Received for publication September 15, 1966.