【摘要】 以耐荫品种扬麦158和不耐荫品种扬麦11两个小麦品种为材料,研究了拔节至成熟期遮光对小麦籽粒产量、淀粉含量和淀粉糊化特性的影响,并分析了花前营养器官非结构碳水化合物转运及其与籽粒产量、淀粉含量和淀粉糊化特性的关系.结果表明:遮光条件下小麦花前营养器官中可溶性总糖转运量的下降是造成小麦籽粒产量降低的原因之一;小麦支链淀粉在遮光条件下显著降低而直链淀粉变化不明显,导致小麦籽粒总淀粉含量和支/直显著下降;遮光降低了两品种小麦籽粒淀粉峰值粘度;降低了不耐荫品种扬麦11的低谷粘度,提高了其糊化温度,但对耐荫品种扬麦158的低谷粘度和糊化温度无显著影响.更多还原

【Abstract】 This paper studied the effects of shading in the period from jointing to maturity on the grain yield,starch content,and starch paste traits of two winter wheat (Triticum aestivum L.) cultivars,shading-tolerant Yangmai 158 and shading-intolerant Yangmai 11,and analyzed the relationships of the redistribution of total soluble sugars stored before anthesis in vegetative organs with the grain yield,starch content,and starch paste parameters of the cultivars. The results showed that shading decreased the redistribution of pre-anthesis stored total soluble sugars in vegetative organs to reproductive organ,resulting in the decrease of grain yield,and significantly decreased the amylopectin content but had no effects on the amylose content in grains,inducing a significant decrease in the ratio of amylopectin to amylase content in the grains. Shading also decreased the grain starch peak viscosity of the cultivars. Under shading,Yangmai 11 had a decrease of its grain starch through viscosity and an increase of starch pasting temperature,while Yangmai 158 had lesser responses in the two parameters.更多还原