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Article
Exotic Corn Lines with Increased Resistant Starch and Impact on Starch Thermal Characteristics
Cereal Chemistry
  • Kim A. Rohlfing, Iowa State University
  • Linda M. Pollak, United States Department of Agriculture
  • Pamela J. White, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
5-1-2010
DOI
10.1094/ CCHEM-87-3-0190
Abstract
Ten parent corn lines, including four mutants (dull sugary2, amyloseextender sugary2, amylose-extender dull, and an amylose-extender with introgressed Guatemalen germplasm [GUAT ae]) and six lines with introgressed exotic germplasm backgrounds, were crossed with each other to create 20 progeny crosses to increase resistant starch (RS) as a dietary fiber in corn starch and to provide materials for thermal evaluation. The resistant starch 2 (RS2) values from the 10 parent lines were 18.3–52.2% and the values from the 20 progeny crosses were 16.6–34.0%. The %RS2 of parents was not additive in the offspring but greater RS2 in parents was correlated to greater RS2 in the progeny crosses (r = 0.63). Differential scanning calorimetry (DSC) measured starch thermal characteristics, revealing positive correlations of peak gelatinization temperature and change in enthalpy with %RS2 (r = 0.65 and r = 0.67, P ≤ 0.05); however, % retrogradation (a measure of RS3) and retrogradation parameters did not correlate with %RS2. The %RS2 and onset temperature increased with the addition of the ae gene, likely because RS delays gelatinization.
Comments

This article is from "Cereal Chemistry", 2010, 87(3); 190-193. DOI: 10.1094/ CCHEM-87-3-0190.

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
Kim A. Rohlfing, Linda M. Pollak and Pamela J. White. "Exotic Corn Lines with Increased Resistant Starch and Impact on Starch Thermal Characteristics" Cereal Chemistry Vol. 87 Iss. 3 (2010) p. 190 - 193
Available at: http://works.bepress.com/pamela_white/53/