[Effects of shading on wheat grain starch quality and redistribution of pre-anthesis stored nonstructural carbohydrates].

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.