关键词: 投影寻踪, 稻米, 综合品质, 关键影响因子

Abstract: In order to clarify the variation trend and key impact factors of rice quality of  medium Indica rice in Anhui province from 2009 to 2019, the comprehensive evaluation function of Indica rice quality in projection pursuit was established based on the latest quality standards of edible rice varieties of Ministry of Agriculture and Rural Affairs by using the projection pursuit model of accelerated genetic algorithma. The variation trend of comprehensive quality of Indica rice in Anhui province and its influencing factors were analyzed by this model. The results showed that the comprehensive rice quality of medium Indica rice in Anhui province increased significantly. The analysis result of the projection pursuit model was consistent with the change trend of the proportion of high-quality rice above grade 3 tested by the participating combinations in each year. The trend of the proportion of high-quality rice above grade 3 among the approved varieties also confirmed this law. The remarkable progress of Anhui medium Indica rice breeding in head rice rate, chalky grain rate and chalkiness promoted the improvement of the comprehensive quality of rice. Chalky grain rate, chalkiness and amylose content were the key factors affecting the comprehensive quality of Anhui medium indica rice varieties. In  future, reducing the chalky grain rate and chalkiness, maintaining an appropriate amylose content, and increasing the polished rice rate would get be  the main direction of Anhuis future quality breeding. At the same time, we must also pay attention to the improvement of alkali depreciation traits.

Key words: projection pursuit, rice comprehensive quality, key impact factor