Abstract:

【Objective】 In order to provide a reference for selection of reasonable species for eggplant grafted during winter planting, the contribution of root and scion to cold resistance of grafted eggplant seedlings was studied. 【Method】 Two rootstock eggplant cultivars, Daidaro (T), susceptible to cold and Hiranasu (C) is more resistant, were used to be grafted on each other. Based on this strategy, the physiology parameters including electrolyte leakage, MDA content and main osmotic adjustment substances in grafted seedling leaves before and after low temperature stress were studied. 【Result】 After low temperature treatment electrolyte leakage and MDA content in T-leaves of TC/TC, TC/C, TC/T was significantly higher than C-leaf in the same combination, but were observably lower than that of T/T, meanwhile, the content of soluble sugar, soluble protein and proline in T-leaves of combination of grafted seedlings was notably higher than that of T/T. All the results above indicate that both root and shoot of Hiranasu can enhance cold resistance of Daidaro in grafting experiment. Although TC/C had more resistance than TC/TC and TC/T which is the most sensitive to cold, all three of them were in the shade compared to C/C. So it can be concluded that both root and shoot of Daidaro had a negative effect on cold resistance of scion Hiranasu. 【Conclusion】 TC/C was more cold resistance than TC/T, so root had more contribution than shoot to cold resistance of grafted seedlings.

Key words: eggplant, rootstock, combination of grafted seedling, low temperature stress, cold resistance