Analysis on combining ability of major agronomic traits for ten maize inbred lines

In the experiment,ten quality protein maize(QPM) inbred lines were used for diallel cross with Griffing Ⅳ model and 45 single-cross combinations were produced.The combining ability was analyzed by checking plant height,ear height,ear length,ear thickness,row number per ear,grain number per ear,yield per plant,100-grain weight and produced seed ratio of F1 plant.The results showed that the combinations of 9903,9904 and 9902 had higher general combining ability effect of ear and yield characters,so have higher utilizable value.The yield trait of the combination 9901 was superior and it could be utilized with inbred lines of fine ear characters for supplement.The inbred lines 3346 and 2601 had the worst comprehensive characters and need to be further improved.Moreover,the other inbred lines could be utilized according to the breeding objective.