Abstract: Using three cultivars of one-year-old kiwifruit seedlings Hongyang （Actinidia chinensis）， White （Actinidia eriantha Benth.） and Bruno （Actinidia deliciosa） as materials， we studied the influence of water-flooding on waterlogging index（WI）， root activity， membrane permeability， MDA content and the activities of SOD， POD. The treatment lasted for 5 days. The results showed that the WI of three cultivars of kiwifruit seedlings were increased with the stress time and the WI of Bruno was the lowest. The root activity decreased under waterlogging， though White had the highest root activity and Bruno had the smallest decrease compared with Hongyang and White. The cell membrane permeability of leaf and MDA content showed increasing trends. On the fifth day of waterlogging treatment， the cell membrane permeability and MDA content increased smallest in the seedlings of Bruno. The activity of SOD and POD throughout the 5-day waterlogging period had an increasing-decreasing tendency and Bruno always maintained a relatively high level of both SOD and POD activities. Thus, the tolerance of Bruno under waterlogging is higher than White and Hongyang.

Key words: kiwifruit（Actinidia chinensis Planch）, seedling, waterlogging, tolerance