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Article
Phenotypic Characterization of Quality Protein Maize Endosperm Modification and Amino Acid Contents in a Segregating Recombinant Inbred Population
Crop Science
  • Andres Gutierrez-Rojas, Texas A & M University - College Station
  • M. Paul Scott, United States Department of Agriculture
  • Otto R. Leyva, Colegio de Postgraduados, Cordoba, Mexico
  • Monica Menz, Texas A & M University - College Station
  • Javier Betrán, Texas A & M University - College Station
Document Type
Article
Publication Version
Published Version
Publication Date
9-1-2008
DOI
10.2135/cropsci2007.08.0429
Abstract
The protein quality of maize (Zea mays L.) can be improved by replacing normal Opaque2alleles with nonfunctional recessive alleles (o2). Homozygous o2 kernels have increased levels of lysine and tryptophan. Unfortunately, the associated soft texture of the o2 kernels causes poor yield and susceptibility to diseases and insects. Breeding has resulted in the development of o2 genotypes with improved endosperm hardness; such genotypes are referred to as quality protein maize (QPM). Quality protein maize germplasm is utilized in breeding programs worldwide and has been competitive in yield trials. To understand the genetics of endosperm modification, a population of 146 recombinant inbred lines (S5 to S7) derived from a cross between the o2 inbred B73o2 and the QPM inbred CML161 was evaluated in two Texas locations from 2004 to 2006. The endosperm traits texture, opacity, and vitreousness were highly affected by inbred line genotype, were highly correlated with each other, and exhibited high broad-sense heritability. Relative content of the essential amino acids lysine, tryptophan, and methionine were also highly affected by the inbred line genotype, and exhibited high broad-sense heritability. Negative correlation was observed between endosperm texture traits and amino acid contents. Favorable responses to selection can be expected for both endosperm texture modification and relative content of the essential amino acids if they are efficiently monitored.
Comments

This article is published as Gutierrez-Rojas, Andres, M. Paul Scott, Otto R. Leyva, Monica Menz, and Javier Betrán. "Phenotypic characterization of quality protein maize endosperm modification and amino acid contents in a segregating recombinant inbred population." Crop science 48, no. 5 (2008): 1714-1722, doi: 10.2135/cropsci2007.08.0429.

Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Citation Information
Andres Gutierrez-Rojas, M. Paul Scott, Otto R. Leyva, Monica Menz, et al.. "Phenotypic Characterization of Quality Protein Maize Endosperm Modification and Amino Acid Contents in a Segregating Recombinant Inbred Population" Crop Science Vol. 48 Iss. 5 (2008) p. 1714 - 1722
Available at: http://works.bepress.com/paul-scott/60/