摘要
[目的]研究弱光条件下,小麦籽粒及面粉加工品质的变化。[方法]以耐阴品种扬麦158和不耐阴品种扬麦11 2个小麦品种为材料,设不遮光(S0)、从拔节至成熟期遮去小麦冠层自然光强的22%(S1)和遮去小麦冠层自然光强的33%(S2)3个处理,测定小麦籽粒淀粉及其组分含量、蛋白质及其组分含量、降落值、湿面筋含量、沉淀值以及淀粉糊化特性和粉质参数。[结果]小麦支链淀粉含量在遮阴条件下显著降低,而直链淀粉含量变化不明显,小麦籽粒总淀粉含量和支/直显著下降;遮阴降低了2个品种的峰值黏度和扬麦11的低谷黏度,提高了2个品种的降落值和扬麦11的糊化温度,但对耐阴品种扬麦158的低谷黏度和糊化温度无显著影响;在长期弱光条件下,小麦籽粒蛋白质含量提高,醇溶蛋白、麦谷蛋白、麦谷蛋白大聚合体和高分子量谷蛋白亚基含量显著增加,引起湿面筋含量、沉淀值、面团形成时间和稳定时间的提高,面团弱化度的降低。[结论]拔节到成熟期的弱光处理对小麦蒸煮品质不利,却提高了小麦的烘焙品质。该研究为林麦间作系统以及长江中下游地区的小麦生产提供了重要的理论依据。
[Objective] To reveal the effects of shading on quality of grain and flour processing properties.[Method] Two winter wheat（Triticum aestivum L.） cultivars,differing in shading（low radiation） tolerance,Yangmai 158 and Yangmai 11 were shaded to evaluate the impact of low radiation on starch and its components contents,protein and its components contents,falling number,wet gluten content,SDS-sediment,starch paste traits and farinogram parameters.Three treatments were designed from jointing to maturity,as non-shading（S0）,22% less intercept radiation（S1） and 33% less intercept radiation（S2）.[Result] Shading showed no effect on amylose content while significantly reduced amylopectin content,which resulted in the significant decrease in the ratio of amylopectin to amylase content in grain.Shading decreased the starch peak viscosity of both cultivars and the through viscosity of Yangmai 11,increased falling number of both cultivars and pasting temperature of Yangmai 11,while showed no effects on starch through viscosity and pasting temperature in shading tolerant cultivar of Yangmai 158.Under long-term low radiation conditions,grain protein content increased with the increase in the contents of gliadin,glutinin,GMP and HMW-GS,which caused the increase of wet gluten content,SDS-sediment,development time and stability time,and the decline of softening degree.[Conclusion] This study indicated that shading from jointing to maturity was disadvantage to cooking qualities of wheat,but improved baking qualities.This research would afford important theoretical basis for wheat production in wheat-tree intercropping system and the middle-down area of Yangtze River.
出处
《安徽农业科学》
CAS
北大核心
2011年第33期20568-20570,20579,共4页
Journal of Anhui Agricultural Sciences
基金
江苏省高校自然科学研究项目(10KJB210002)
中国博士后科学基金项目(20110491442)
江苏省博士后科学基金项目(1101059C)
关键词
小麦
弱光
淀粉
蛋白质
加工品质
Winter wheat
Shading
Starch
Protein
Processing quality
