4.7 Article

Effects of short-term heat stress at the grain formation stage on physicochemical properties of waxy maize starch

Journal

JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
Volume 98, Issue 3, Pages 1008-1015

Publisher

WILEY
DOI: 10.1002/jsfa.8549

Keywords

waxy maize; heat stress; granule size; starch structure; physicochemical property

Funding

  1. National Key R&D Program of China [2016YFD0300109]
  2. National Natural Science Foundation of China [31471436]
  3. Natural Science Foundation of Jiangsu Provincial Higher Education Institutions [14KJA210004]
  4. Priority Academic Program Development of Jiangsu Higher Education Institutions
  5. Qing Lan Project of Jiangsu

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BACKGROUNDWaxy maize (Zea mays L. sinensis Kulesh) suffers short-term exposure to high temperature during grain filling in southern China. The effects of such exposure are poorly understood. RESULTSStarch granule size was increased by 5 days' short-term heat stress (35.0 degrees C) and the increase was higher when the stress was introduced early. Heat stress increased the iodine binding capacity of starches and no difference was observed among the three stages. Starch relative crystallinity was increased and swelling power was decreased only when heat stress was introduced early. Heat stress also increased the pasting viscosity, and this effect became more pronounced with later applications of stress. Heat stress reduced starch gelatinization enthalpy, and the reduction gradually increased with later exposures. Heat stress increased the gelatinization temperature and retrogradation enthalpy and percentage of the samples, with the increases being largest with earlier introduction of high temperature. CONCLUSIONHeat stress increased the pasting viscosities and retrogradation percentage of starch by causing change in granule size, amylopectin chain length distribution and crystallinity, and the effects observed were more severe with earlier introduction of heat stress after pollination. (c) 2017 Society of Chemical Industry

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