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Proceedings Paper

Starch granule formation and protein deposition in wheat (Triticum aestivum L.) starchy endosperm cells is altered by high temperature during grain fill
Author(s): William J. Hurkman; Delilah F. Wood
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Paper Abstract

High temperatures during wheat grain fill decrease starch and protein levels, adversely affecting wheat yield and flour quality. To determine the effect of high temperature on starchy endosperm cell development, grain (Triticum aestivum L. 'Butte 86') was produced under a 24/17°C or 37/28°C day/night regimen imposed from flowering to maturity and starch and protein deposition examined using scanning electron microscopy. The high temperature regimen shortened the duration of grain fill from 40 to 18 days. Under the 37/28°C regimen, A- and B-type starch granules decreased in size. A-type starch granules also exhibited pitting, suggesting enhanced action of starch degradative enzymes. Under both temperature regimens, protein bodies originated early in development and coalesced during mid to late development to form a continuous protein matrix surrounding the starch granules. Under the 37/28°C regimen, the proportion of protein matrix increased in endosperm cells of mature grain. Taken together, the changes in starch granule number and size and in protein matrix amount provide clues for understanding how high temperature during grain fill can affect end use properties of wheat flour.

Paper Details

Date Published: 3 June 2010
PDF: 8 pages
Proc. SPIE 7729, Scanning Microscopy 2010, 77291R (3 June 2010);
Show Author Affiliations
William J. Hurkman, USDA Agricultural Research Service (United States)
Delilah F. Wood, USDA Agricultural Research Service (United States)

Published in SPIE Proceedings Vol. 7729:
Scanning Microscopy 2010
Michael T. Postek; Dale E. Newbury; S. Frank Platek; David C. Joy, Editor(s)

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