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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #139619
Title: RICE MILLING QUALITY AND STARCH BRANCHING AS AFFECTED BY HIGH NIGHT TEMPERATURES

Author
item COUNCE, PAUL - UA RREC
item Bryant, Rolfe
item BAUTISTA, R - UNIV. ARKANSAS
item Bergman, Christine
item WANG, Y - - UNIV. ARKANSAS
item SIEBENMORGEN, T - UNIV. ARKANSAS
item MOLDENHAUER, KAREN - UA RREC

Submitted to: American Association of Cereal Chemists Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 10/13/2002
Publication Date: 10/13/2002
Citation: Counce, P.A., Bryant, R.J., Bautista, R.C., Bergman, C.J., Wang, Y.J., Siebenmorgen, T.J., Moldenhauer, K.A. 2002. RICE MILLING QUALITY AND STARCH BRANCHING AS AFFECTED BY HIGH NIGHT TEMPERATURES. American Association of Cereal Chemists Meetings. Oct. 13-17, 2002 Abstract #164.

Interpretive Summary: N/A - Abstract ONLY

Technical Abstract: High night time temperatures have been thought to reduce rice head rice yields. Tests have not been done to determine whether this is true. A controlled climate experiment was conducted in which the conditions were the same except for the temperature between 12 midnight and 5 AM were: (1) 18°C (64°F) for the low temperature treatment and (2) 24°C (75°F) for the high temperature treatment. The high temperature treatment reduced head rice yields compared to the low temperature treatment. Amylopectin chain lengths between Degree of Polymerization 13-24 were greater for LaGrue than for Cypress and greater for the high temperature treatment than for the low temperature treatment. This research demonstrates that for a range of temperature conditions likely found in Arkansas during rice grain filling, higher temperatures, as expected, reduced head rice yields. Future research will focus on identifying lines resistant to high temperature reductions of head rice yields and incorporating this characteristic into Arkansas cultivars.