Abstract: The seedling of Malus hupehensis Rehd var pingyiensis Jiang was used to study the effects of high-temperature on bioluminescence and the changes of ATP content, rate of total respiration and cyanide-resistant respiration. The results indicated that the intensities of ultraweak luminescence (UWL) and fluorescence of leaves all decreased in initial stage of high temperature stress. But with the prolongation of high-temperature stress time both of them were gradually increased and got back to control level at 48h of treatment. While phosphorescence intensity was continuously rose during the period of high temperature stress. Under high temperature stress, the rate of total respiration was decreased, the rate of cyanide-resistant respiration rose, and the production of ATP decreased. This suggested that the bioluminescence has close relation to the pathway of respiration and energy metabolism in Malus hupehensis (Pamp) Rehd. var. pingyiensis Jiang.

Key words: Malus hupehensis (Pamp) Rehd. var pingyiensis Jiang, high temperature, bioluminescence, cyanide-resistant respiration, ATP