Effect Of Grafting On Watermelon Quality Characters And Genetic Polymorphism Revealed By AFLP

In this experiment,we studied the grafting experiment with four kinds of stocks on five species of watermelons.Then selected high viability seedlings planted in soil medium culture,and used watermelom's leaves and fresh as experiment materials.And researched the differents of quality traits and molecular genetic level among grafting watermelons and own-rooted watermelons.The major results were described as follows:1.The root system of grafted plants is stronger, with better absorbing function and more superior vitality than own-rooted ones,which promote the over-ground growth.So the grafted plants have more unisonous nexus between the over-ground part and the underground part of the watermelon plant.Grafting would intensify the plant resistance to Fusarium oxysporum and accelerate the stem widen.But the survival rates of grafting watermelons were lower than own-rooted watermelons.2.The results showed that these stocks had little influence on the peel thickness,fruit shape, and sugar content of watermelon,but had great influence on fruit size,weight of single fruit and taste,.3.The fruits'Lycopene content,Chlorophyll contents and Vc content had little influence.But the different kinds of fresh colour of different kinds of grafted watermelons had great effects on. Lycopene content.4.The leaves'Chlorophyll contents,Peroxide enzyme(POD) activities and Superoxide dismutase(SOD) activities among grafting watermelons and own-rooted watermelons varied greatly.5.Polymorphism among the different grafting watermelons and own-rooted watermelons was analyzed based on AFLP markers.There were 819 recordable bands generated by 30 AFLP primer combinations,ll polymorphic bands were generated by primer combinations.he results generally indicated that the level of genetics had changed,but the genetic diversity revealed by the AFLP among the grafting watermelons and own-rooted watermelons would be quite low.