粳稻籽粒硬度与品质性状的相关性分析OA

To clarify the distribution characteristics of grain hardness index in different types of japonica rice and its relationships with cooked rice hardness,palatability score,and physicochemical properties of japonica rice,this study used 27 japonica rice cultivars to determine 25 indicators,including grain hardness index,physicochemical properties,Rapid Visco Analyzer(RVA)profile characteristics,and palatability score.The distribution characteristics of grain hardness in-dex in different types of japonica rice and the correlations between grain hardness index and quality traits of japonica rice were analyzed.The results showed that the distribution range of grain hardness index was widest in waxy japonica rice cultivars,while it was most concentrated in ordinary japonica rice.The average grain hardness index followed the order:waxy japonica rice＜semi-glutinous japonica rice＜ordinary japonica rice.The grain hardness index of japonica rice was highly significantly positively correlated with cooked rice hardness,amylose content,peak viscosity,hot paste viscosity,cold paste viscosity,breakdown value,peak time,and setback value,and was significantly positively correlated with grain length and head rice yield.It was highly significantly negatively correlated with palatability score,appearance of cooked rice,stickiness of cooked rice,balance of cooked rice,gel consistency,transparency grade,chalky grain rate,and chalkiness degree,and was significantly negatively correlated with broken rice rate.These correlations were more pronounced in semi-glutinous japonica rice cultivars.The grain hardness index of japonica rice showed significant correlations with eating quality,appearance quality,and processing quality.Research on grain hardness is beneficial for breeding japonica rice cultivars with good eating quality,appearance quality,and processing quality,providing a reliable theoretical basis for quality breeding of japonica rice and accelerating the development of superior-tasting japonica rice cultivars.