水稻低直链淀粉资源筛选

为了在水稻外观品质改良的同时提高食味品质,通过对引自IRRI及中国水稻种质资源库的1000多份材料测定直链淀粉含量,并对IRRI资源测定外观品质。研究发现：目前水稻优良食味品种多数外观品质差,且“软米”标准欠缺。水稻直链淀粉含量分布十分宽,其中软米范围品种数量少,糯米品种较软米品种多,且分为优质糯稻与劣质糯稻两类。其他类型品种数量最多,直链淀粉含量变异最大,软米类型品种蛋白质含量显著高于糯稻及较高直链淀粉含量品种。本试验通过筛选获得12份软米资源,为软米选育提供了多样化资源,并给出了一个软米判定标准。

Low-amylose Rice Resources: Screening

To improve the appearance and taste quality of rice simutaneously, the amylose contents in more than 1000 rice varieties from IRRI and China Rice Germplasm Resource Bank were determined, and the appearance quality of IRRI resources was identified. The results showed that most of rice varieties with good taste had poor appearance quality and the “soft rice” standard was deficient. The amylose contents of rice were widely distributed, and the number of varieties in the soft rice range was small. The glutinous rice varieties were slightly more than “soft rice” varieties, and they were divided into high-quality glutinous rice and low-quality glutinous rice. The other types had the largest number of variety and the largest variation in amylose content, the soft rice type had significantly higher protein content and higher amylose content than glutinous rice. Twelve soft rice resources were screened in this experiment, which provided diversified resources for soft rice breeding, and a criterion for judging soft rice.