| In this paper,20hybridized combinations derived from five corn inbred lines Dan340, Dan1324, S0073, Chang7-2and Shen5003, designed by the Griffing complete diallel method1,were analysised by multi-point test of variance analysis method, Grey evaluation method and Similarity-difference Theory, results are as follows:1. Multi-year test of variance analysis method(1) There is significant difference between M03and M02, extreme differences between M03and18other hybrid combinations; significant differences between M02and M04, M20, M16; no significant differences between M02and other hybrid combinations except M03,M04,M20,M16; extreme differences between M02and M20, M16; extreme diffenence between M14, M07and M20, M16; no significant difference with other hybrid combination; M02’s variability is least, and it indicates M02’s average yield is most stable.(2) According to the overall performance,20hybrid combinations were separated into4classes. First-class contains M03and M02; Secend-class contains M14、M07、M05、M01; Third-class contains M12, M10, M08, M17. M19, M18, M15, M11, M06, M09, M13, M04, M20, M16.2. Gray Evaluation method analysis result(1) The greatest impact on corn yield’s agronomic traits are ear weight,ear diameter, ear rows, rows per ear and100-seed weight; agronomic traits of impacting on corn quality are plant height, stem diameter, leaf number and kernels per row; Bare tip length has least effect on yield and seed quality; Quality traits’correlation degree order in all Gray Evaluation analysis result is protein> fat>starch.(2)In this analysis result, M03,M07,M14were awarded first-class combination for three times; M01,M02,M08,M12were awarded first-class for two times; M06and M13were awarded third-class combination for three times; M16,M18and M20were arwarded third-class for two times; The rest hybrid combinations were in general.3. Similarity-difference theory analysisThe results of similarity-difference theory anslysis are basically the same with the results of gray evaluation method analysis. In diffenent years or different traits as breeding objectives, the classification of the same combination is not much different.(1) Agronomic traits impacting on corn yield are ear weight, ear diameter, ear row number,100-seed weight and kernels per row. agronomic traits impacting on corn quality are leaf number, kernel number per row, ear diameter. Bare tip length has smallest impact on corn yield and quality in all the analysis results. Value of the order to quality traits are protein> fat> starch.(2)In the results of annual and comprehensive analysis, M02, M03, M07, M14were awarded good combination for three times. It indicates that these four combinations’overall performance is absolutely outstanding. M05,M08,M10were awarded good combination for two times, and the overall performance is fairly prominent in comprehensive analysis. M13and M16were awared general combination for three times, and overall performance is the worst. M04,M06and M20were awarded general combination for two times,and both of them has poor performance. The other eight combinations’performance is in general.4.Relations between corn’s traits and yield, qualityTo integrate Gray Evaluation analysis results and Similarity-difference theory analysis results, ear weight, ear diameter, ear rows, rows per ear and100-seed weight impact on corn yield greatest, and these traits are mainly concentrated in the panicle. Leaf number, kernels per row,and plantheight,stem diameter,ear diameter, rows per ear have great impact on corn quality. Bare tip length has smallest impact on both corn yield and quality.When the yield act as objective, the quality order always is protein> fat> starch. |
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