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RESPONSE TO S(1) PER SE AND RECIPROCAL FULL-SIB SELECTION WHEN TESTED IN A WIDE ARRAY OF ENVIRONMENTS
Abstract
Two contrasting recurrent selection methods were compared for improvement of index and its components using Nebraska Krug (K), Nebraska Stiff Stalk Synthetic (S), and Nebraska B Synthetic (B) maize populations. Index, the selection criterion, is composed of yield (adjusted to 15.5% moisture) x proportion of upright plants x proportion of retained ears. Progress through three cycles of replicated S(,1) per se and reciprocal full-sib (RFS) selection was evaluated by estimating stability parameters using the Eberhart and Russell (1966) model. Evaluations were made using random-mated populations from the original and base populations together with K, S, and B replicate subpopulations (entries) selected in the third cycle by both methods. Gains in index and its components from S(,1) per se selection were observed in the K and S entries but not in the B selected material. The index increase was due to an increase in proportion of retained ears in the K entries and increase in corrected weight in the S entries. Similar response from RFS selection was observed in the K and S improved entries. Linear regression coefficients increased with both selection methods when calculated across 15 environments. K and S entries had higher index values in both favorable and unfavorable environments, whereas B entries had yield advantage only under favorable conditions. Selection replicates, though selected in different years, showed no discernable pattern in response to environments.
Subject Area
Agronomy
Recommended Citation
JONES, DONALD CRAIG, "RESPONSE TO S(1) PER SE AND RECIPROCAL FULL-SIB SELECTION WHEN TESTED IN A WIDE ARRAY OF ENVIRONMENTS" (1984). ETD collection for University of Nebraska-Lincoln. AAI8423797.
https://digitalcommons.unl.edu/dissertations/AAI8423797