Preliminary Observation of Healing Process for Different Stock & Scion Combination Grafting of Citrus paradise Varieties

T typed bud grafting experiments on 9 introduced Citrus paradise varieties and 3 stock species were respectively conducted in the summer and autumn, and the healing process was observed by checking the callus growth status. The results are as follows:The callus was initially formed on the 8^th day of grafting, and the healing process for the upper part around the bud occurred earlier than the lower part.Varieties of No.4(Hudson), No.6(Ray Ruby), No.7(Reed Marsh) and No.8(Rio Red) matched well with local grapefruit stock.Variety No.9(St Foster ar Ruby) could match well with all the 3 tested stock species if the grafting was carried out in the summer; while it could match better with the other 2 stock species when the grafting was done in the autumn.Varieties of No.1(Flame), No.2(Genetic Dwarf), No.3(Henderson Ruby) and No.5(Perlist) did not match very well with any of the 3 stock species. Comparatively speaking, the local grapefruit stock was more suitable to varieties of No.1, No.2 and No.3 than the other 2 stock species.