Effects Of Cultivation Measures On Barley Starch And Content Of Soluble Sugar

In this study,four barley varieties,Mengpi 3,Ganpi 4,Mengpi 5 and Kenpi 7,were used as test materials.From 2017 to 2019,field experiments and pot experiments were used to study different nitrogen fertilizers,density and moisture.Changes of starch and soluble sugar content during the grain filling stage under the treatment,analysis of the correlation between the total starch,amylose,and amylopectin content of the barley mature stage and the soluble sugar content in leaves,stems and grains,and exploring the starch accumulation characteristics of barley grains,It provides a theoretical basis for high-quality barley production.The main results are as follows:1. With the increase of nitrogen application level,the content of total starch,amylose and amylopectin showed a trend of first increasing and then decreasing,and reached the maximum value under N1 treatment(90kg/hm~2).The soluble sugars content in leaves,stems and grains showed a trend of increasing first and then decreasing,and reached the maximum value under N2 treatment(180kg/hm~2).2. With the planting density increased,the content of total starch,amylose and amylopectin showed a tendency to increase first and then decrease,and reached the maximum value in D3 treatment(5.25 million plants/hm~2).The soluble sugar content in leaves,stems and grains both showed a trend of increasing first and then decreasing,and reached the maximum value in D3 treatment.3. With the amount of watering increased,the content of total starch,amylose and amylopectin showed a trend of increasing first and then decreasing,and reached the maximum value in the W2 treatment(40%of the maximum water holding capacity in the field).The soluble sugar content in leaves,stems and grains showed a trend of increasing first and then decreasing,and reached the maximum value in W2 treatment.4. Correlation analysis results showed that the soluble sugar content of the four varieties of barley at different filling stages was not significantly correlated with the total starch,amylose,and amylopectin content at 7 days after flowering.The contents of total starch,amylose and amylopectin in grains were all significantly and positively correlated.The contents of total starch,amylose and amylopectin in the grains during the maturity stage are very significantly positively correlated with the soluble sugar content in the leaves,stems and grains of each stage.5. Path analysis results showed that the most significant effects on the total starch,amylose and amylopectin content of the four varieties of barley and barley at the mature stage were the soluble sugar content in leaves 14d after anthesis,soluble sugar content in stems 21d after anthesis and 7d after anthesis grain soluble sugar content.