Journal
CARBOHYDRATE POLYMERS
Volume 98, Issue 1, Pages 302-310Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.06.005
Keywords
Waxy maize; Heat stress; Grain weight; Nutrient content; Physicochemical properties
Categories
Funding
- Chinese Natural Science Foundation [31271640, 31000684]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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The effects of high temperature during different grain filling stages (1-15 d and 16-30 d after pollination) on the physicochemical properties of four varieties of waxy maize grain were studied. Heat stress during grain filling decreased grain weight and starch deposition, while it increased protein content, starch granule size, abnormal granule numbers and iodine binding capacity. These effects were more severe when heat stress was introduced at early development stage than at late grain filling stage. The peak intensities and crystallinities were decreased when plants were exposed to high temperature at early development stage. By contrast, responses to high temperature at late development stage were variety-dependent. High temperature during grain filling decreased the peak and breakdown viscosities and increased the gelatinization temperature and enthalpy, and retrogradation percentage of flours, especially during early development stage. In conclusion, high temperature during grain filling changed the grain proximate and starch structure, resulting in the deterioration of pasting and thermal properties. (C) 2013 Elsevier Ltd. All rights reserved.
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