Campus Units

Agronomy

Document Type

Article

Publication Version

Published Version

Publication Date

2000

Journal or Book Title

Crop Science

Volume

40

Issue

2

First Page

338

Last Page

346

DOI

10.2135/cropsci2000.402338x

Abstract

Use of adequate effective population size in maize (Zea mays L.) recurrent selection programs is important because of random genetic drift and inbreeding depression. The objectives of this study were to (i) evaluate the performance of the BS11 Cycle 0 (C0) and the BS11 Cycle 5 (C5) populations from four S1-progeny selection programs each with a different effective population size (5, 10, 20, or 30) but with a common selection intensity of 20%, and (ii) compare the additive genetic variance among the C0 and C5 populations. Five cycles of selection were conducted by intermating 5, 10, 20, or 30 lines. One hundred thirty C5 S1 lines from each of the selected populations (i.e., C5–5, C5–10, C5–20, and C5–30) and 100 C0 S1lines were topcrossed to BS11 C0. The resulting half-sib progenies were evaluated at five environments in a replications-within-sets incomplete block design. The four selection programs resulted in significant increases in grain yield, reduced grain moisture, and reduced root and stalk lodging. For yield, the 10-S1 program showed the highest gain cycle−1 of 0.16 Mg ha−1 followed by the 30-S1 program with 0.13 Mg ha−1 cycle−1 The 5-S1 program had a higher gain cycle−1 than the 20-S1 program. The additive genetic variance for yield did not change significantly. Heritability for yield was highest for C5–20, but no significant differences were observed among populations. These results suggest little to no advantage of using larger effective population sizes to maintain genetic variability for short-term recurrent selection.

Comments

This article is published as Guzman, Peter S., and Kendall R. Lamkey. "Effective population size and genetic variability in the BS11 maize population." Crop science 40, no. 2 (2000): 338-346. doi: 10.2135/cropsci2000.402338x. Posted with permission.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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