May
2012
Volume
89
Number
3
Pages
168
—
175
Authors
Sarah B. Lanning,1
Terry J. Siebenmorgen,1,2
Amogh A. Ambardekar,1
Paul A. Counce,3 and
Rolfe J. Bryant4
Affiliations
Department of Food Science, University of Arkansas, 2650 N. Young Ave., Fayetteville, AR 72704.
Corresponding author. Phone: (479) 575-2841. Fax: (479) 575-6936. E-mail: tsiebenm@uark.edu
University of Arkansas Rice Research and Extension Center, Stuttgart, AR 72160.
USDA ARS Dale Bumpers National Rice Research Center, Stuttgart, AR 72160.
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RelatedArticle
Accepted March 20, 2012.
Abstract
ABSTRACT
Elevated nighttime air temperatures (NTATs) occurring during critical grain-filling stages affected rice physicochemical properties, which impacted functional quality. Six cultivars were grown at multiple field locations from northern to southern Arkansas during 2007 to 2010. Nighttime temperatures were recorded throughout production at each of the locations, and 95th percentiles of NTATs were calculated for each cultivar's reproductive (R) stages. Amylose content and crude protein content decreased linearly, whereas total lipid content increased linearly, with increasing NTATs occurring during the grain-filling stages (R6–R8). Effects of NTAT on proximate composition influenced functional properties. Peak viscosities increased linearly as NTAT increased, whereas setback viscosities decreased. Setback viscosities were linearly correlated to NTATs for medium-grain cultivars, but correlations were quadratic for the long-grain cultivars. Gelatinization temperatures increased linearly with increasing NTAT. The R stages in which correlations were strongest varied by cultivar and by property, hypothesized to result from differences in kernel development patterns among cultivars. These findings have significant implications for rice production scientists and processors, in that understanding the effects of NTAT on physicochemical and functional properties may help explain and reduce quality variation.
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© 2012 AACC International, Inc.