《Table 1 Relative crystallinity and IR spectral properties of starch》

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《Effect and Its Mechanism of Brassinolide-regulated Starch Metabolism in Rice Germination》

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Each value is repeated 3 times，and the data is the mean±standard deviation；"；**"；indicates that the value is different from the control group at an extremely significant level（P<0.01）；"；*"；indicates that the value is significantly diffe

To investigate whether BL treatment affected the fine structure of rice starch，the crystallinity and ordered structure of starch in the 2 groups of materials were further analyzed.Starch granule structure includes crystalline region and amorphous region.The crystallization region is mainly composed of amylopectin molecules with a double helix structure，which is structurally stable and is not easily destroyed by external forces.The amorphous region is composed of amylose molecules with loose structure，which is easy to be destroyed by external forces and chemical components[14].At present，XRD technology is a relatively mature method to determine the crystal type and calculate the crystallinity.It is easy to operate，and the result is reliable.The XRD results were as shown in Fig.4，and the crystallinity data of the tested samples showed that the crystallinity of the BL treated samples was significantly higher than that of the control group（Table 1）.