Effects of low temperature and poor light on the antioxidant enzymes in leaves of own-rooted and grafted eggplant seedlings

This paper studied the differences of low temperature and poor light tolerance and the activity of protective system against active oxygen between own-rooted and grafted eggplant seedlings.The results showed that chilling tolerance of the grafted eggplant seedlings was higher than that of own-rooted seedlings under the conditions of low temperature and poor light(8℃,80 μmol/(m2·s)).Under the conditions of 8℃ low temperature,the chilling injury index,electrolytic leakage rate,and MDA content in the grafted eggplant seedlings were lower than those in the own-rooted seedlings.The activities of SOD,GPX and APX in the leaves of two kinds of seedlings increased,especially for own-rooted seedlings.The activities of CAT in the leaves of two kinds of seedlings decreased,especially for own-rooted seedlings.The antioxidant enzymes in the leaves of grafted seedlings were more insusceptible than those in own-rooted seedlings.The oxidative damage of grafted seedlings were less than that in own-rooted seedlings,and the electrolytic leakage rate in grafted seedlings was lower than that in own-rooted seedlings,thus the grafted seedlings were more chilling tolerant than own-rooted seedlings.