Genetic Diversity as Affected by Selection Methodology in Native Grass Species

Genetic Diversity as Affected by Selection Methodology in Native Grass Species

The utilization of native grasses for widespread plantings is limited by availability and cost of adapted seed sources. The objectives of this study were to assess the genetic diversity of locally collected blue grama (Bouteloua gracilis) and little bluestem (Schyzachyrium scoparium) populations and to examine potential shifts in genetic diversity using two selection methodologies. The ecovar method involved selection of the 20% highest seed yielding genotypes with equal representation from all populations while the ‘cultivar’ method involved selecting the highest 5% based on overall rank. Phenotypic variability was observed for morphological and reproductive traits between collected populations of both species. The ecovar and cultivar selection strategies improved seed yield potential in both species. For little bluestem, the ecovar method improved seed production potential without affecting other morphological traits. Preliminary results suggest that genetic diversity can be maintained while improving seed yield in native grass species.