Dynamic Accumulations of Starch Content in Mutated Wheat Strains Induced by High-pressure Treatment

In order to understand the starch dynamic synthesis in the process of grain filling of wheat induced by high-pressure treatment,processing and utilization of starch,the dynamic accumulation of starch content was studied.Wheat variety Yanzhan 4110 was treated with high-pressure(120 Mpa)for 8 hours.During the growth and maturation of wheat plants,five mutants,named as Gaoya 2,Gaoya 3,Gaoya 5,Gaoya 9,Gaoya 11,were selected as experimental materials,Yanzhan 4110 as the control.The results showed that:high-pressure treatment could affect the process of grain filling.The dynamic change of starch,amylose and amylopectin contents showed an S-shape in filling stage.The increased rate of starch,amylose and amylopectin contents during filling stage showed aslowfast-slowtrend.The maximum accumulating rate of starch,amylose and amylopectin content appeared at 15~20d after anthesis.The starch,amylose and amylopectin contents of Gaoya 2and Gaoya5 were higher than the control,while that of Gaoya 9 was lower than that of the control at mature stage.Starch content of Gaoya 2 and Gaoya 9 was 80.99% and 73.5%,respectively,while the control was 77.38%(P0.05).There was a very significant difference between the changes of accumulationrate of starch,amylase and amylopectin in different grains(P0.05).The peak rate of starch and amylopectin of the control group was higher than that of other high pressure treated samples,the amylose peak rate of Gaoya 2 and Gaoya 5 was significantly higher than the control.