作物学报 ›› 2017, Vol. 43 ›› Issue (05): 777-786.doi: 10.3724/SP.J.1006.2017.00777
• 耕作栽培·生理生化 • 上一篇
刘希伟1,张敏1,李勇2,张玉春1,宋霄君1,赵城1,蔡瑞国1,*
LIU Xi-Wei1,ZHANG Min1,LI Yong2,ZHANG Yu-Chun1,SONG Xiao-Jun1,ZHAO Cheng1,CAI Rui-Guo1,*
摘要:
花后弱光影响小麦淀粉分子积累和结构形成,进而使面粉的加工品质和食用品质变劣。本研究以非糯小麦轮选987和糯小麦农大糯50206为材料,设置3个花后遮光处理(不遮光、遮光30%和遮光60%),研究了花后不同强度遮光对小麦籽粒中淀粉组分及其理化特性的影响。结果表明,花后弱光胁迫使小麦籽粒中总淀粉含量减少,A-型淀粉粒比例增加,淀粉相对结晶度增大。花后光照强度降低,轮选987淀粉的峰值黏度、谷值黏度、最终黏度、稀澥值和反弹值增大,而农大糯50206淀粉的上述参数则呈减小趋势。轮选987淀粉的起始温度、峰值温度和终止温度随弱光胁迫的增强而降低,而糊化焓呈增加趋势;相反,农大糯50206淀粉的上述热力学特征参数呈降低趋势。相关性分析表明,直链淀粉含量、直/支比、A-型淀粉粒体积比例与相对结晶度、峰值黏度、谷值黏度、稀澥值、糊化时间和糊化焓呈显著负相关,与最终黏度和反弹值存在极显著正相关。可见,小麦花后光照强度降低影响籽粒淀粉组分和粒度分布,从而改变了淀粉的晶体、糊化和热力学特性。
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