关键词: 铝胁迫, 白苦瓜, 幼苗生长, 生理指标

Abstract: In order to explore the physiological mechanism of white balsam pear under aluminum stress, this paper studied the effects of aluminum stress at different concentrations (50 mg/L, 100 mg/L, 250 mg/L, 500 mg/L, 800 mg/L) on the growth and physiological indexes of white balsam pear seedlings. The results showed that 50 mg/L AlCl3 had no significant inhibitory effect on the seedlings of white balsam pear after 20 d stress. With the increase of aluminum stress concentration, the inhibition effect on seedlings of white balsam pear gradually became stronger. Under the stress of 800 mg/L AlCl3, the growth of white balsam pear seedlings were significantly inhibited, and plant height was only 20.16% of the control. Comparing with the physiological indexes, the growth indexes of white balsam pear seedlings (plant height and fresh weight) were more sensitive to aluminum stress. Under aluminum stress, white balsam pear would resist the damage caused by aluminum stress through increasing POD activity. Under aluminum stress, the decrease of chlorophyll content and root activity was important reason for the inhibition of white balsam pear growth.

Key words: aluminum stress, white balsam pear, seedling growth, physiological characteristics