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Contrasting Effects of Selection on Sequence Diversity and Linkage Disequilibrium at Two Phytoene Synthase Loci[W]

Open access
Palaisa, Kelly A., Morgante, Michele, Williams, Mark, Rafalski, Antoni·2003·The Plant Cell

Abstract

We investigated the effects of human selection for yellow endosperm color, representing increased carotenoid content, on two maize genes, the Y1 phytoene synthase and PSY2, a putative second phytoene synthase. Multiple polymorphic sites were identified at Y1 and PSY2 in 75 white and yellow maize inbred lines. Many polymorphic sites showed strong association with the endosperm color phenotype at Y1, but no detectable association was found at PSY2. Nucleotide diversity was equivalent for whites and yellows at PSY2 but was 19-fold less in yellows than in whites at Y1, consistent with the white ancestral state of the gene. The strong sequence haplotype conservation within yellows at Y1 and a significant, negative Tajima's D both verified positive selection for yellow endosperm. We propose that two independent gain-of-function events associated with insertions into the promoter of the Y1 gene and upregulation of expression in endosperm have been incorporated into yellow maize.

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Metadata

Authors
Palaisa, K. A., Morgante, M., Williams, M., & Rafalski, A.
Venue
The Plant Cell
Published
2003-08-01
Volume
15
Issue
8
Pages
1795-1806
ISSN
  • 1040-4651 (ISSN-L)
  • 1532-298X
OpenAlex
W2141113133
Cited by
272
References
4
FWCI
5.53
Type
journal article
Language
en
Open access
green

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Palaisa, K. A., Morgante, M., Williams, M., & Rafalski, A. (2003). Contrasting Effects of Selection on Sequence Diversity and Linkage Disequilibrium at Two Phytoene Synthase Loci[W]. The Plant Cell. https://doi.org/10.1105/tpc.012526

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