Avena sativa, natural selection
A mixture of F3 seeds from 75 oat crosses was divided into four lots, with one being propagated in central Iowa for nine generations (i.e., stationary line of descent) and three being propagated in a rotational pattern in central, southern, and northern Iowa in successive generations (i.e., disruptively selected line of descent). An evaluation experiment was conducted to test whether any changes in genotypic frequencies were caused by the two propagation procedures. Increases in the means of yield traits occurred, but the magnitude and timing of the changes varied among lines of descent. The changes in the stationary and rotational lines of descent were indistinguishable. There was some trend for reduced genotypic variances for most traits with advancing generations. Probably the disruptive selection scheme did not cause differential results from the stationary one because the selection pressure due to differences in propagation sites was mild relative to the pressure due to differences in weather patterns during the years of the propagation period.
Proceedings of the Iowa Academy of Science
© Copyright 1980 by the Iowa Academy of Science, Inc.
Adegoke, A. O. and Frey, K. J.
"Disruptive and Nondisruptive Selection for Bulk Oat Populations,"
Proceedings of the Iowa Academy of Science: Vol. 87:
, Article 9.
Available at: http://scholarworks.uni.edu/pias/vol87/iss4/9