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In order to select the best rootstock cultivars suitable for grafting muskmelon(Cucumis melo L.)variety Tianbao in Qingdao,6 rootstock cultivars were used in this experiment.The changes of survival rate,physiological indexes,economic characters and fruit quality of muskmelon grafted with different rootstock cultivars were analyzed.The results showed that grafting could significantly improve the survival rate and en-hance the photosynthesis and root vitality of continuous cropping muskmelon plants,and increase the trans-verse and longitudinal diameters,single fruit weight and yield of muskmelon fruits.The single fruit weight and yield of muskmelon grafted with Qingnong 4 were the highest,which increased by 42.9%and 88.7%compared with the self-rooted seedlings,respectively.The contents of soluble solid,soluble sugar and VC,and the solid-acid ratio and sugar-acid ratio of muskmelon after grafting reduced to varying degrees,but the organic acid content increased to varying degrees,and the soluble protein content changed in different degrees.The con-tents of soluble solid,soluble sugar and VC,and the solid acid ratio and sugar-acid ratio of the muskmelon grafted with Mugeng 719 were second only to those of self-rooted seedlings,but there were no significant differ-ences in fruit texture indexes such as hardness,adhesion,cohesiveness,elasticity,adhesiveness and chew-ability.Grafting had no significant effect on aroma components of muskmelon fruits except grafting with Sheng-zhen 1 rootstock,but might lead to the reduction of volatile substances such as ammonia.In the principal com-ponent analysis,the first principal component had the contribution rate of 96.14%,and the data distribution showed that the grafted muskmelon with Mugeng 719 was the closest with the self-rooted seedlings.Comprehen-sive analysis showed that the muskmelon grafted with Mugeng 719 had good fruit quality and the best compre-hensive performance;the muskmelon grafted with Qingnong 4 had the highest yield and the second comprehen-sive performance.The two cultivars could be used as excellent rootstock varieties for Tianbao muskmelon grafting.
