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Temporal genetic structure patterns in tropical maize populations under reciprocal recurrent selection.

Solomon, K.F. and Martin, I. and Zeppa, A. (2010) Temporal genetic structure patterns in tropical maize populations under reciprocal recurrent selection. Euphytica, 176 (2). pp. 239-249.

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Article Link(s): http://dx.doi.org/10.1007/s10681-010-0238-4

Publisher URL: http://www.springeronline.com

Abstract

In order to investigate the effect of long term recurrent selection on the pattern of gene diversity, thirty randomly-selected individuals from the progenitors (p) and four selection cycles (C0, C3, C6 and C11) were sampled for DNA analysis from the tropical maize (Zea mays L.) breeding populations, Atherton 1 (AT1) and Atherton 2 (AT2). Fifteen polymorphic Simple Sequence Repeat markers amplified a total of 284 and 257 alleles in AT1 and AT2 populations, respectively. Reductions in the number of alleles were observed at advanced selection cycles. About 11 and 12% of the alleles in AT1 and AT2 populations respectively, were near to fixation. However, a higher number of alleles (37% in AT1 and 33% in AT2) were close to extinction. Fisher's exact test and analysis of molecular variance (AMOVA) showed significant population differentiations. Gene diversity estimates and AMOVA revealed increased genetic differentiations at the expense of loss of heterozygosity. Population differentiations were mainly due to fixation of complementary alleles at a locus in the two breeding populations. The estimates of effective population at an advanced selection cycle were close to the population size predicted by the breeding method.

Item Type:Article
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Springer Science+Business Media B.V.
Keywords:Allele frequency; gene diversity; recurrent selection; Zea mays L.; size; DNA; tropical maize; breeding populations; frequency; BSSS.
Subjects:Plant culture > Field crops > Corn. Maize
Science > Biology > Genetics
Deposited On:28 Feb 2011 05:22
Last Modified:26 Oct 2011 02:31

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