利用人工气候箱控制温度,在相对湿度40％的条件下,分别在30℃、35℃、39℃、41℃的高温胁迫下,对盆栽臭椿、白蜡、光皮树、黄连木、构树5个树种离体叶片的生理生化特性进行研究.结果表明:在试验温度范围内,臭椿、黄连木和构树的相对电导率最大值出现在35℃时,分别为50.43％、94.30％和81.26％；光皮树和白蜡的相对电导率的最大值分别出现在39℃时和41℃时,分别为75.34％、74.66％.臭椿和白蜡脯氨酸含量在41℃时最高,分别为4.86×10-7 μg/g和2.15×10-7 μg/g；光皮树、黄连木和构树的脯氨酸含量39℃时最高,分别为2.17×10-7μg/g、8.12×10-7μg/g、6.90×10-7μg/g.臭椿和黄连木的可溶性糖含量39℃时最大,分别为20.61％和17.51％,白蜡、光皮树和构树叶片组织细胞的可溶性糖含量41℃时最大,为21.44％、17.60％和16.05％.高温胁迫下,植物叶片组织受到明显地破坏,随着温度的升高,叶片组织中的相对电导率升高；脯氨酸含量和可溶性糖含量逐渐积累.综合分析认为,在被选的5个乔木树种中,白蜡和构树为较耐高温树种.%Under the condition of high temperature (30°C , 35℃,and 41℃) and the atmospheric relative humidity of 40%, the physiological and biochemical characters indexes (relative e-lectric conductivity,free praline content and soluble sugar content) were studied using the leaves of Ailanthus altissima ,Fraxinus chinensis ,Cornus wilsonian ,Pistacia chinensis and Broussonetia papyrifera as materials. The results showed that the plant leaf tissues were obviously damaged under the condition of heat stress. With the temperature rising,the relative electric conductivity of leaf tissue increased, the free praline content and soluble sugar content gradually accumulated. The relative electric conductivity of Ailanthus altissima , Fraxinus chinensis , Cornus wilsonian , Pistacia chinensis and Broussonetia papyrifera reached a maximum when the temperature was 35℃ ,41℃ ,39℃ ,35℃ and 35℃ ,respectively. The free praline content of the five species accumulated to a maximum when the temperature was 41℃ ,41℃ ,39℃ ,39℃ and 39℃ .respectively. The soluble sugar content of the five species accumulated to a maximum when the temperature appeared 39℃ ,41℃ ,41℃ ,39℃ and 41℃,respectively. The results indicated that Fraxinus chinensis and Broussonetia papyrifera were able to bear more high temperature than other species.
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