Abstract:

【Objective】 The aim of the experiment is to study the effect of hot water treatment of bulbs on heat tolerance of lily plants. 【Method】 Asiatic hybrid ‘Pollyanna’ was used as the experimental material, and the bulbs were dipped into the hot water at 45℃ for different times of 0, 10, 20, 30, 40 and 50 min. After planting, the physiological indices and the electrical impedance spectroscopy parameters of young plants under heat stress at 38℃ were studied. 【Result】 Heat shocked bulbs for 20 min promoted the activity of SOD and the content of soluble sugar in the leaves, they were higher than the control by 65.95% (P＜0.01), and 23.75% (P＜0.01), respectively. The root activity was higher than the control by 57.11% (P＜0.01), but there was no significant difference between relaxation time and control. Although SOD activity and soluble sugar content reached the peak after 30 min of treatment, there was no significant difference with 20 min treatment, and the root activity decreased rapidly. 【Conclusion】 Lily plants can acquire heat tolerance obviously through hot water treatment of bulbs for 20 min.

Key words: lily (Lilium)')">lily (Lilium), hot water treatment, physiological indices, electrical impedance spectroscopy, heat tolerance