Effects of short-term heat stress at the grain formation stage on physicochemical properties of waxy maize starch
Effects of short-term heat stress at the grain formation stage on physicochemical properties of waxy maize starch
复制标题
籽粒形成期短期热胁迫对糯玉米淀粉理化性质的影响
DOI：
10.1002/jsfa.8549
复制
发表时间：
2018-02-01
影响因子：
4.1
通讯作者：
Lu, Dalei
中科院分区：
文献类型：
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作者：
Gu, Xiaotian;Huang, Tianqi;Lu, Dalei
背景中国玉米(Zea Mays L.sinensis Kulesh)在中国南部灌浆期遭受短期高温胁迫。结果短期热应激5天(35.0℃)可使星形胶质细胞颗粒增大，且应激越早，颗粒增大越明显。热胁迫提高了淀粉的碘结合力，三个阶段之间没有差异。只有在较早引入热胁迫时，淀粉的相对结晶度才会增加，膨胀势才会降低。热胁迫也增加了糊化粘度，而且这种影响随着胁迫的后期施加而变得更加明显。高温胁迫降低了淀粉的糊化热，且随着胁迫时间的延长，降低的幅度逐渐增大。热胁迫提高了样品的糊化温度、回生热焓和糊化率，且随温度的升高而增加。结论热胁迫通过改变淀粉颗粒大小、支链长度分布和结晶度来增加淀粉的糊化粘度和回生百分率，授粉后较早引入热胁迫的影响更为严重。(三)2017年化学工业学会
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