Effects of Light Intensity on Growth and Antioxidant Enzyme Activities of Amur Corktree Seedlings
An experiment was conducted to study the effects of light intensity on seedling growth and anti-oxidative activities of a-mur corktree (Phellodendron amurense) under light intensities of 100% , 75% , 50% and 25% of sunlight. Result showed that amur corktree seedlings had the best growth under 75% of sunlight. The fresh weight of amur corktree seedlings decreased , root/shoot ratio and chlorophyll content increased with the decrease of light intensity, while chlorophyll a/b declined. Malondialdehyde (MDA) content, activities of superoxide dismutase (SOD), peroxidase (POD) and catalase ( CAT) enhanced with the increase of light intensity except for some situations under 75% of sunlight. Anti-oxidative activity of seedlings increased although strong light strengthened membrane lipid peroxidation. Strong light is unfavourable for seedling development, and artificial culture benefits the growth of P. amurense seedlings under proper shading conditions ( relative light intensity of 75% ).
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