Genetic Effects Associated with Reciprocal Recurrent Selection in BSSS and BSCB1 Maize Populations

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Keeratinjakal, Vichien
Lamkey, Kendall
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Lamkey, Kendall
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The Department of Agronomy seeks to teach the study of the farm-field, its crops, and its science and management. It originally consisted of three sub-departments to do this: Soils, Farm-Crops, and Agricultural Engineering (which became its own department in 1907). Today, the department teaches crop sciences and breeding, soil sciences, meteorology, agroecology, and biotechnology.

The Department of Agronomy was formed in 1902. From 1917 to 1935 it was known as the Department of Farm Crops and Soils.

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  • Department of Farm Crops and Soils (1917–1935)

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Reciprocal recurrent selection (RRS) was designed to capitalize on both additive and nonadditive genetic effects for improvement of the cross between two populations by complementary changes in allelic frequencies between populations. Eleven cycles of RRS have been completed in the Iowa Stiff Stalk Synthetic (BSSS) and Iowa Corn Borer Synthetic No. 1 (BSCB1) maize (Zea mays L.) populations. The objectives of this study were to partition the response to selection into that due to additive and dominance genetic effects and to evaluate the effects of genetic drift. A population diallel of the CO, C4, C7, C9, and Cll cycles of BSSS(R) and BSCB1(R) the C8 and C10 inte rpopulation crosses of BSSS(R) and BSCB1(R) were evaluated. The populations per se selfed and interpopulation crosses selfed of the CO, C4, C7, C8, C9, CI0, Cll cycles also were included in the study. The study was evaluated at four locations in 1988 and three locations in 1989. The response of the interpopulation cross for grain yield was 0.28 ± 0.04 Mg ha-1 cycle-1 and was primarily due to dominance effects. Responses in the populations per se, adjusted for the effects of genetic drift, were similar to the direct effects in the interpopulation cross. Improvementin BSSS(R) was due to both additive and dominance effects, but only dominance ffects were important in BSCBI(R). The results showed that selection response occurred at loci with alleles with partial to complete dominance with no evidence for overdominant alleles contributing to selection response. There were no significant changes in grain moisture, and the responses for root and stalk lodging were in the desired direction. It is concluded that RPS was effective for improving the interpopulation cross and inbreeding depression from genetic drift limited the observed response in the populations per se.


This article is published as Keeratinijakal, Vichien, and Kendall R. Lamkey. "Genetic effects associated with reciprocal recurrent selection in BSSS and BSCB1 maize populations." Crop science 33, no. 1 (1993): 78-82. doi: 10.2135/cropsci1993.0011183X003300010013x. Posted with permission.