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

摘要： 为明确安徽中籼稻米品质变化趋势及关键影响因子，基于农业农村部食用稻品种品质最新标准，利用加速遗传算法的投影寻踪模型初步建立了中籼稻米品质综合评价函数，并对2009—2019年安徽省中籼稻综合品质变化趋势及其关键影响因子进行分析。结果表明，安徽中籼稻米综合品质整体呈显著上升趋势，投影寻踪模型分析结果与参试组合各年实际检测的优质米所占比例变化趋势基本一致，在通过审定品种中三级以上优质米所占比例的变化趋势也证实这一规律。稻米在整精米率、垩白粒率、垩白度等品质指标上的显著进步，促进了综合品质的提升。垩白粒率、垩白度和直链淀粉含量是影响安徽中籼型稻米综合品质的关键因子。降低垩白粒率和垩白度、保持中等直链淀粉含量及提高整精米率仍是安徽未来品质育种的主攻方向，同时也要注意碱消值性状的改良。

关键词: 投影寻踪, 稻米, 综合品质, 关键影响因子