Analysis of Rice Quality Characteristics of Indica Rice Varieties of China in Recent 10 Years

Abstract

Based on the analysis of rice quality characteristics of indica rice varieties from regional trials in recent 10 years, we hope to provide references for quality improvement of indica rice varieties in the next stage. We analyzed 2 701 samples of early season, medium season and late season indica rice samples in 17 provinces (autonomous regions and municipalities directly under the central government) from 2011 to 2020, and divided them into 8 groups according to maturity and regional trials group. Based on the agricultural industry standard “Cooking rice variety quality” NY/T 593, we analyzed the development trend of qualified rate and rice quality index of indica rice varieties in recent 10 years. The results showed that the quality of indica rice varieties in China presented a steady upward trend in recent 10 years, especially for late season indica rice, which improved the most significantly after 2017. The rice quality of mid-late ripe of late season indica rice and sensitive late season indica rice in south China was better than early ripe of late season indica rice; rice quality of medium season indica rice in the middle was better than that of medium season indica rice in the upper Yangtze River; the rice quality of early season indica rice in south China was better than that of other two early season indica rice varieties and has been improved steadily in recent years. Chalkiness degree, alkali spreading value and amylose content of quality indexes have been increasing steadily, gel consistency and brown rice rate keep high standard rate in recent 10 years, the variation of qualified rate in head rice rate and translucency above one level changed greatly from year to year, and there was no obvious trend of improvement. For rice quality index, in addition to keeping on reducing the amylose content and chalkiness degree of indica rice, it is also needed o strengthen the study on inter annual stability of head rice rate and transparency of indica rice. And the improvement of rice quality of medium season indica rice is the key direction for the improvement of indica rice quality in the future.

Keywords

• indica rice
• variety
• rice quality
• southern rice region
• growth period