The relative water content and bound water/free water ratio of assimilative branch in Haloxylon ammodendron seedlings increased with the growth of seedlings.Meantime the osmotic potential and relative conductivity decreased.The cell location of superoxide dismutase in assimilative branchs of seedling showed that the superoxide dismutase activities of organelles varied constantly in the growth period of seedlings

The superiode dismutase activities in cytoplasm

chloroplast and total superoxide dismutase kept up

but went down in mitochondris. There was an exception that the superoxide dismutase activities in seeds were obiviously higher than in seedlings and cotyledons.Maloneldehyde

chlophell contents and chl. a /b ratio gradually rose with the growth of seedlings.Other wise the respiratory rate decreased.