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EVALUATION AND SCREENING OF RESISTANCE TO REPLANT IN GERMPLASM OF GRAPE AND PHYSIOLOGICAL MECHANISMS OF ITS RESISTANCE
Abstract
The aim of the present work was to screen out grape germplasms resisting to replant obstacle, and to analyze their resistant mechanism. Here we used 94 grape resources as the testing materials. The cuttings of each resource were planted in pot filled with control (normal) soil as well as replanting soil. After 2 years investigation, ‘101-14’, ‘8612’were screened for replant-susceptible resources, and ‘Mcadams’, ‘Dawuhezi’ were screened for replant-resisting resource. Under replanting stress, resources with resistance exhibited an increase in maximum photochemical efficiency of PSⅡ, and net photosynthetic rate improved. The MDA content of ‘Mcadams’ planted in normal soil was 25.62% lower than that planted in replant soil, and showed a strong resistance. For ‘Dawuhezi’, the protected enzyme SOD and PPO could be activated under replanting stress, which effectively avoided the harm of active oxygen to the seedling, presenting a more vigorous plant growth.
