Enhanced Graft-take Ratio and Quality of Grafted Tomato Seedlings by Controlling Temperature and Humidity Conditions

초록

This study was conducted to enhance graft-take ratio and quality of grafted tomato seedlings by controllingtemperature and humidity during the healing and acclimatization processes. Three temperature levels (20℃,23℃, and 26℃) were carried out to determine optimum temperature on four rootstocks. In addition, twelve combinationsof three relative humidity levels (70%, 80%, and 90%) and four temperature levels (17℃, 20℃, 23℃, and26℃) were set up to evaluate the effect of relative humidity and temperature on the graft-take ratio of grafted seedlings. In the other hand, five relative humidity periods (H0, H1, H2, H3, and H4: 90% relative humidity for first 0, 1,2, 3 and 10 days and afterwards relative humidity was reduced to 70%, respectively) were examined effect of relativehumidity periods on the graft-take and quality of grafted seedlings. The higher graft-take ratios (84.0~87.4%)were showed at 23℃ compared to 20℃ and 26℃ in all rootstocks. Graft-take ratios decreased and number of diseasedplants increased at high temperature. The graft-take ratios increased with increasing relative humidity in alltemperature levels on the 3rd and 7th day after grafting. However, increasing relative humidity significantly increasedpercent of diseased plants. The graft-take ratio reduced at (26℃) and (17℃) temperature under all relative humidityconditions. The graft-take ratio increased with increasing period of 90% relative humidity. Maximum graft-takeratios were observed in H2 and H3 treatments. Graft-take ratio decreased with increasing 90% relative humidity for10 days (H4). Diseased plants had not been found in H0, H1, H2, and H3 treatments. Seedling quality was improvedthrough increasing fresh and dry weight of root, compactness, and root morphology of tomato seedlings in H2 andH3 treatments. Therefore, high relative humidity (90%) for first 2 or 3 days and afterwards reduced low relativehumidity (70%) at 23℃ condition during healing and acclimatization promoted the graft-take and quality of graftedtomato seedlings.

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