Analysis On The Phylogenetic Ralationship And Heterosis Of Inbred Lines Of Cucumis Melo Sp.Conomon

Using the method of morphology and molecular marker classification,43 inbred lines of Cucumis melo sp.Conomon were divided into 5 subgroups according to their botanical characters, and 6 subgroups according to the genetic distance.In this experiment,12 inbred lines were selected depending on the result of cluster analysis, which have relatively large differences between them.36 F1 hybrids were made by incomplete diallel hybridization, and investigated the main quantitative characters of F1 generation and the parents to analyse the heterosis of Fl generation. It offers materials and theoretical basis during identificating and choosing the parents.The analysis of six quantitative characters which include mid-parent heterosis, over-parent heterosis and over-standard heterosis of the 36 hybridized combinations indicates that nine combinations showed better performence. And the combination of O×5, Q×16, R×17 had higher positive heterosis in the yield and yield character.The analysis of the general combining ability of parents indicates that panrent 9,17, R, Q and 5 were more preferential in breeding new varieties. While through the analysis of the special combining ability, combination R×17、Q×16、O×5、W×5、E×9、V×10、Q×9 and Qx 10 were selected as comprehensive hybrid heterosis,and combination R×17、Q×16、O×5 had extremely hybrid heterosis which showed positive effect in the yield and quality related traits. Therefore, using both of the general combining ability effect value and the special combining ability effect value can predict the hybrid combination, which can be provided as the theoretical basis for the selection of the parents in stimulating the breeding process.