title: Effects of high temperature during grain filling under control conditions on the physicochemical properties of waxy maize flour.
abstract: 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.
authors.affiliation: Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, PR China.
authors.forename: Dalei
authors.initials: D
authors.lastname: Lu
authors.forename: Xuli
authors.initials: X
authors.lastname: Sun
authors.forename: Fabao
authors.initials: F
authors.lastname: Yan
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.forename: Renchao
authors.initials: R
authors.lastname: Xu
authors.forename: Weiping
authors.initials: W
authors.lastname: Lu
mesh_terms: D055598:Chemical Phenomena; D004780:Environment, Controlled; D005433:Flour; D006358:Hot Temperature; D009824:Ointments; D010940:Plant Proteins / Q000032:analysis; D013194:Staining and Labeling; D013213:Starch / Q000032:analysis / Q000737:chemistry; D014885:Waxes / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry* / Q000254:growth & development*
chemical_list: D009824:Ointments; D010940:Plant Proteins; D014885:Waxes; D013213:Starch
keywords: Grain weight; Heat stress; Nutrient content; Physicochemical properties; Waxy maize