Quantitative Trait Loci for Endosperm Modification and Amino Acid Contents in Quality Protein Maize

dc.contributor.author Gutiérrez-Rojas, Andrés
dc.contributor.author Betrán, Javier
dc.contributor.author Scott, Marvin
dc.contributor.author Scott, M. Paul
dc.contributor.author Atta, Halima
dc.contributor.author Menz, Mónica
dc.contributor.department Agronomy
dc.date 2018-02-18T14:52:14.000
dc.date.accessioned 2020-06-29T23:03:04Z
dc.date.available 2020-06-29T23:03:04Z
dc.date.issued 2010-01-01
dc.description.abstract <p>The deficient protein quality of corn (<em>Zea mays</em> L.) grain can be improved by replacing normal <em>Opaque2</em> (<em>O2</em>) alleles with nonfunctional mutant <em>o2</em> alleles. Unfortunately, <em>o2</em> alleles are associated with soft endosperm texture, poor yield, and susceptibility to diseases and insects. Plant breeders have been able to restore a desirable ratio of hard to soft endosperm in <em>o2</em>germplasm. These modified genotypes are known as Quality Protein Maize (QPM). Neither the mechanism nor the genetic components controlling endosperm modification in QPM lines are well understood. Using a population of recombinant inbred lines, derived from a cross between an <em>o2</em> line and a QPM line, and a novel evaluation method for endosperm modification, quantitative trait loci (QTL) were mapped for traits related to the modification of endosperm texture and the content of the essential amino acids lysine, tryptophan, and methionine. Quantitative trait loci clusters for endosperm texture traits were detected on chromosomes 3, 5, 6, and 8, together accounting for 62 to 68% of the observed variation. For traits related to amino acid contents, QTL clusters were located on chromosomes 7 and 8, explaining up to 39% of the observed variation. The elucidation of the genetic mechanisms of the modification of <em>o2</em> endosperm and essential amino acid contents provides valuable information and important tools to plant breeders and plant scientists interested in improving the quality of cereal grains.</p>
dc.description.comments <p>This article is published as Gutiérrez-Rojas, Andrés, Javier Betrán, M. Paul Scott, Halima Atta, and Mónica Menz. "Quantitative trait loci for endosperm modification and amino acid contents in quality protein maize." <em>Crop science</em> 50, no. 3 (2010): 870-879, doi: <a href="http://dx.doi.org/10.2135/cropsci2008.10.0634" target="_blank">10.2135/cropsci2008.10.0634</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/165/
dc.identifier.articleid 1162
dc.identifier.contextkey 10429805
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/165
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4494
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/165/2010_Scott_QuantitativeTrait.pdf|||Fri Jan 14 21:01:23 UTC 2022
dc.source.uri 10.2135/cropsci2008.10.0634
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Plant Breeding and Genetics
dc.title Quantitative Trait Loci for Endosperm Modification and Amino Acid Contents in Quality Protein Maize
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 97acee5f-1291-4c27-8929-a8e1617c411d
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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