The main yield traits,agronomic traits and physiological traits of 13 varieties in the wheat regional trial of Shaanxi during 2014～2015 were comprehensively analyzed,and the key factors which influenced the yield increase of these wheat varieties were explored.The results showed that the high yield stability of wheat could be evaluated effectively by stability parameter method.The grey relational analysis demonstrated that:among the yield traits of wheat,the harvest index and grain number per panicle had bigger degree of grey relation with the yield,and they were the key factors causing yield increase;however,the grain weight per panicle,1000-grain weight and biological yield had less degree of grey relation with the yield.Among the agronomic traits of wheat,the plant-height component index and flowering-stage leaf area had bigger degree of grey relation with the yield;while the panicle length,flag leaf angle and plant height had less degree of grey relation with the yield.Among the physiological traits of wheat,the leaf net photosynthetic rate and single-plant wound flow had bigger degree of grey relation with the yield.Therefore,in the breeding of high-yielding wheat varieties,the traits which had high grey relation with the yield should be improved.%对2014～ 2015年度陕西小麦区域试验13个品种的主要产量性状、农艺性状和生理性状进行了综合分析,探讨了影响小麦产量提高的关键因素,结果表明:利用稳定参数法可以有效地评价小麦的高产稳产性.灰色关联度分析表明,在产量性状中,收获指数和穗粒数与产量的关联度较大,是增产的主要因素,而穗粒重、千粒重和生物学产量与产量的关联度较小;在农艺性状中,株高构成指数和花期叶面积这2个性状与产量的灰色关联度较大,而穗长、旗叶夹角和株高与产量的关联度较小;在生理性状中与产量关联度最大的是叶片的净光合速率和单株伤流量.在小麦的高产品种选育中,应对与产量关联度高的性状进行改良,从而达到提高产量的目的.
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