Grain composition and amino acid content in maize cultivars representing 80 years of commercial maize varieties

dc.contributor.author Scott, Marvin
dc.contributor.author Edwards, Jode
dc.contributor.author Scott, Marvin
dc.contributor.author Bell, C.
dc.contributor.author Schussler, J.
dc.contributor.author Smith, J.
dc.contributor.department Agronomy
dc.contributor.department Genetics
dc.date 2018-02-17T13:45:28.000
dc.date.accessioned 2020-06-29T23:07:01Z
dc.date.available 2020-06-29T23:07:01Z
dc.date.issued 2006-01-01
dc.description.abstract <p>In order to determine how modern hybrids have impacted grain composition and amino acid content of the corn crop, we characterized a set of cultivars that were widely grown in different eras from the 1920s through 2001. Grain composition exhibited clear trends with time, with protein decreasing and starch increasing. The effects of different plant densities were examined. The grain protein content of modern hybrids responds to plant density and environment differently than the protein content of older varieties. These differences are consistent with a model in which protein content is modulated by different growth conditions. These differences may explain, in part, the mechanism by which modern hybrids maintain yield in different environments, i.e. reduction of protein content in stressful environments frees resources that are used to maintain yield. We examined the content of the nutritionally limiting essential amino acids lysine, methionine and tryptophan in grain of these cultivars. On a per tissue mass basis, the levels of these amino acids dropped with time while on a per protein basis, their levels were not significantly changed. We conclude that the development of modern hybrids has resulted in maize with reduced protein content, but the nutritional quality of this protein has not changed.</p>
dc.description.comments <p>This article is from <em>Maydica</em> 51 (2006): 417.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/76/
dc.identifier.articleid 1090
dc.identifier.contextkey 8192970
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/76
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/5048
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/76/2006_ScottMP_GrainCompositionAmino.pdf|||Sat Jan 15 01:50:51 UTC 2022
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Genetics
dc.subject.disciplines Plant Breeding and Genetics
dc.subject.keywords Protein quality
dc.subject.keywords Plant densities
dc.subject.keywords Nutritional quality
dc.subject.keywords Essential amino acids
dc.title Grain composition and amino acid content in maize cultivars representing 80 years of commercial maize varieties
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
File
Original bundle
Now showing 1 - 1 of 1
Name:
2006_ScottMP_GrainCompositionAmino.pdf
Size:
125.16 KB
Format:
Adobe Portable Document Format
Description:
Collections