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Genetic analysis of pericarp pigmentation variation in Corn Belt dent maize.
Schoemaker, Dylan L; Qiu, Yinjie; de Leon, Natalia; Hirsch, Candice N; Kaeppler, Shawn M.
Afiliação
  • Schoemaker DL; Department of Plant and Agroecosystem Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA.
  • Qiu Y; Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455, USA.
  • de Leon N; Department of Plant and Agroecosystem Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA.
  • Hirsch CN; Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA.
  • Kaeppler SM; Department of Plant and Agroecosystem Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA.
G3 (Bethesda) ; 14(1)2023 Dec 29.
Article em En | MEDLINE | ID: mdl-37950891
The US standard for maize commercially grown for grain specifies that yellow corn can contain at maximum 5% corn of other colors. Inbred parents of commercial hybrids typically have clear pericarp, but transgressive segregants in breeding populations can display variation in pericarp pigmentation. We identified 10 doubled haploid biparental populations segregating for pigmented pericarp and evaluated qualitative genetic models using chi-square tests of observed and expected frequencies. Pigmentation ranged from light to dark brown color, and pigmentation intensity was quantitatively measured across 1,327 inbred lines using hue calculated from RGB pixel values. Genetic mapping was used to identify loci associated with pigmentation intensity. For 9 populations, pigmentation inheritance best fit a hypothesis of a 2- or 3-gene epistatic model. Significant differences in pigment intensity were observed across populations. W606S-derived inbred lines with the darkest pericarp often had clear glumes, suggesting the presence of a novel P1-rw allele, a hypothesis supported by a significant quantitative trait locus peak at P1. A separate quantitative trait locus region on chromosome 2 between 221.64 and 226.66 Mbp was identified in LH82-derived populations, and the peak near p1 was absent. A genome-wide association study using 416 inbred lines from the Wisconsin Diversity panel with full genome resequencing revealed 4 significant associations including the region near P1. This study supports that pericarp pigmentation among dent maize inbreds can arise by transgressive segregation when pigmentation in the parental generation is absent and is partially explained by functional allelic variation at the P1 locus.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Genes de Plantas / Zea mays Idioma: En Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Genes de Plantas / Zea mays Idioma: En Ano de publicação: 2023 Tipo de documento: Article