Gray Relational Grade Analysis of Main Agronomic Traits and Harvest Index of Wheat

To explore the relationship of wheat agronomic traits and its effect on yield and further provide the reference for super high yield breeding in Henan province,nine new wheat cultivars were selected as materials to analyze the gray correlations between plant height,grain number per spike,peduncle length,stem biomass,total biomass yield,1 000-grain weight and harvest index.The results showed that the order of gray correlation with yield per plant was total biomass yield(0.699 6)main stem biomass yield(0.479 1)grain number per spike(0.452 0)1 000-grain weight(0.419 7)plant height(0.257 3)peduncle length(0.208 7)ear length(0.204 4)harvest index(0.195 3),while the order of gray correlation with harvest index was peduncle length(0.397 7)ear length(0.353 8)grain number per spike(0.283 7)main stem biomass yield(0.259 9)plant height(0.223 2)1 000-grain weight(0.221 2)yield per plant(0.180 3)total biomass yield(0.175 6).This indicated that,for breeding the wheat variety with super high yield,the biomass yield,grain number per spike and 1 000-grain weight should be increased on the basis of high spike number and harvest index.