Estudo da enxertia hipocotiledonar do maracujazeiro-amarelo sobre dois porta-enxertos, através de microscopia eletr?nica de varredura

摘要

The objective of this work was to verify how much time after the accomplishment of the hypocotyledonary grafting occurs the weld or adhesion between graft and rootstock, and also the formation of the bridge of callus, verified for the total fulfilling of the slot for secondary meristematic tissue (callus). It was produced 56 seedlings of yellow passion fruit (P. edulis Sims f. flavicarpa Deg.) by the hypocotyledonary grafting in full crack in the top on two rootstocks (P. edulis Sims f. flavicarpa Deg. e P. alata Dryander). On the 0, 3, 6, 9, 12, 15 and 18 days after grafting, it was collected the region of the grafting of four seedlings of each combination. The collected material was fixed in a solution of glutaraldehyde at 3%, post-fixed in osmium tetroxide of the osmium at 2%, dehydrated in a series of ethyl alcohol (30, 40, 50, 60, 70, 80, 90, 100%), led to the drier of critical point (CO2), mounted, with metalized with gold - palladium (35 nm) and, finally, observed and eletromicrographed in a scanning electronic microscope JEOL JSM 5410 (operated at 15 kV). It was discovered that, six days after grafting, the welding for the rootstock P. alata had already occurred, which was only evidenced by P. edulis f. flavicarpa on the ninth days. Also, on the ninth day, it was observed on both rootstocks, the complete bridge of callus formation, indicating that, from this point, you can start the acclimation process of seedling, to take it to an environment of lower humidity.