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Phenotypic Recurrent Selection for Seedling Vigor in Side-oats Grama, Bouteloua curtipendula (Michx.) Torr.¹

We evaluated three cycles of phenotypic recurrent selection for seedling vigor in Bouteloua curtipendula (Michx.) Torr. Seeds from each of the three cycles, from the base material, and from a drilled increase block of the base material were included in all trials. Bulk seed harvests in 1963 were used to drill field trials in 1964, 1965, and 1966. Bulk harvests in 1964 were used for additional trials in 1965 and 1966.

Relative to the base material the third cycle established more (35%) and taller (24%) seedlings over the five trials. Number and height of seedlings were closely correlated, r = .80. However, a path coefficient analysis indicated that in one trial seedling height was much more important than seedling number in determining first-year forage yields. Differences in stand usually had little effect on forage yield. However, any increase in ability to produce a stand is desirable because it reduces the possibility of stand failure.

Seed from the Syn-1 of the base material produced results intermediate between the base material and the advanced cycles. This apparent natural selection emphasizes the importance of seeded as opposed to transplanted plots.

Key Words: Stand establishment

² Research Geneticist, U. S. Southern Great Plains Field Station, Woodward, Oklahoma and Assistant Professor, Agronomy, Oklahoma State University; and Agricultural Research Technician, U. S. Southern Great Plains Field Station, Woodward, Oklahoma 73801, respectively. The authors acknowledge the assistance of Dr. W. R. Kneebone in conducting the selection program and Drs. O. J. Hunt and D. J. Hutchison in conducting the evaluation trials.

Received for publication April 4, 1969.

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