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Phenotypic and Genotypic Variation and Covariation of Some Quantitative Turf Characters of Poa pratensis L.¹

Fifteen seed sources (accessions) of Kentucky bluegrass (Poa pratensis L.) constituting a rather broad based, random sample of bluegrass turf types, were grown to study several turf characteristics. Individual plants were transplanted into pots on two dates and ultimately space planted to the field.

Measurements on six characteristics were made: (1) leaf width, (2) growth habit, (3) leaf angle, (4) rust resistance, (5) total spread and (6) sod spread. All characters were found to be highly significant for the accessions genetic mean square.

Broad sense heritability and genetic coefficients of variation were calculated as estimates of the genetic variability among these accessions. Phenotypic and genotypic correlation coefficients were also computed, and indicated that simultaneous selection may be possible for important characters in the development of superior turf types.

Key Words: Selection • Broad sense heritability • Phenotypic correlation • Genotypic correlation

² Graduate Research Assistant (Now Assistant Professor, Department of Agronomy and Soils, Auburn University), Associate Professor and Professor of Agronomy, Purdue University, Lafayette, Ind. 47907.

Received for publication January 23, 1969.