The purpose of this research was conducted to determine anthocyanin constituent from the grains of Purple black rice No. 6. Moreover, the in vitro antioxidant activity of black rice pigment (BRP) was evaluated. The crude extract of black rice was isolated and purified by silica gel thin layer chromatography. Anthocyanins were elucidated using ultraviolet visible spectroscopy, infrared spectroscopy, nuclear magnetic resonance spectroscopy, and high-performance liquid chromatography. Meanwhile, salicylic acid Fenton system, superoxide radical system, H 2 O 2 scavenging system, DPPH-free radical scavenging system,

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The genetic diversity of 36 rice landraces and 43 breeding materials in the upper reaches of the Yangtze River in China was studied by intragenic molecular markers of 26 starch synthesis-related loci. And research on quality traits such as the amylose content (AC), gel consistency (GC) and alkali spreading value (ASV) to analyze genetic differences in quality traits. The results showed that the number of alleles, average gene diversity and polymorphism information content values of landraces were higher than those of breeding materials. The genetic similarity coefficient (GS) of 79 rice materials ranged from 0.392 to 1, with an average of 0.757.There were significant variations in the quality traits of rice landraces and breeding materials, and the high-quality compliance rates were low, only 6.3% of the varieties have an amylose content that reached grade 1. The results of cluster analysis and population structure analysis are generally consistent; that is, the two resource types are closely related and cannot be clustered independently. This study can provide a basis for genetic improvement of rice starch quality. Make full use of the quality genetic diversity of landraces in modern breeding work, further broaden the genetic base of rice and improve rice quality.