A COMPARISON OF METHODS OF EVALUATING RUSSIAN WILD RYEGRASS FOR SEEDLING VIGOR

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Abstract
Twelve clonal lines of Russian wild ryegrass and the polycross seed from them were used for this study. The lines were evaluated for seedling vigor in the greenhouse, field, and laboratory. Seedling vigor was assessed on the basis of emergence from three depths of seeding, speed of germination, and relative root growth in glass tubes.Seed size of the parental clones and emergence of their progenies from a [Formula: see text]-inch seeding depth showed positive correlations of +0.76 and +0.83 in the greenhouse and field, respectively. Emergence from shallow seedings and relative root growth in glass tubes did not vary sufficiently to provide measured differentiation in seedling vigor. Speed of germination showed some indication that it might be used to determine seedling vigor.Selecting large-seeded lines and subjecting them to deep seeding in either the greenhouse or field is suggested as a suitable method of incorporating seedling vigor into a breeding program.

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