4种李属彩叶树木对SO2的抗性

Resistance to Sulfur Dioxide of Four Colored-Leaf Species in Prunus

采用简易静态熏气系统对盆栽苗木进行熏气处理,研究不同浓度SO2对紫叶李、紫叶矮樱、黑杆樱李及美人梅4种李属彩叶树木叶片膜脂过氧化、抗氧化酶活性、脯氨酸含量、吸硫量和可溶性蛋白质含量及叶液pH的影响。结果表明:随着SO2浓度增加,4种彩叶树木叶片膜透性增大,丙二醛(MDA)、脯氨酸和可溶性蛋白质含量增加,过氧化物酶(POD)、超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性上升,叶液pH值下降;吸硫量增加,4种树木的吸硫量有明显差异,其中黑杆樱李的吸硫量最大。采用模糊数学隶属度公式对各项指标测定值进行转换并进行相关分析得出,4种彩叶树木对SO2的抗性由强到弱的顺序为紫叶李、黑杆樱李、美人梅、紫叶矮樱,细胞膜透性、CAT活性、POD活性、SOD活性和脯氨酸、可溶性蛋白质、MDA含量等指标可以作为彩叶植物对SO2抗性的重要鉴定指标。

This paper studied the resistance of four colored-leaf species in Prunus to sulfur dioxide to provide scientific references for selecting proper species as ornamental trees in landscape. The changes in activities of superoxide dismutase （SOD） and peroxidase （POD）, membrane permeability, pH of extracted leaf fluid, and contents of malondialdehyde （MAD）, proline and soluble proteins, absorbed sulfur were measured with two-year-old potted seedlings of Prunus cerasifera var. atropurpurea, Prunus × cistenena ＇ Pissardii＇, Prunus wrasifers ＇ nigra＇ and Prunus × bliriana ＇ Meirenmei＇ which were cultivated in a closed chamber after being treated with different concentrations of sulfur dioxide. The results showed that the membrane permeability, contents of MDA, proline, soluble protein, absorbed sulfur and the activities of SOD, POD, CAT increased, while the pH value decreased with the increment of sulfur dioxide concentration. The seven indexes, therefore, can be considered as main indexes for evaluating the resistance of colored-leaf plants to SO2 . There was significant difference in absorbed sulfur content among four tree species, with the most in P. wrasifers ＇ nigra＇ . Synthetical evaluation result of subordinate function analysis suggested that the resistance of four colored-leaf species to sulfur dioxide ranked from P. cerasifera var. atropurpurea, P. wrasifers ＇ nigra＇ , P. × bliriana ＇Meirenmei＇ to P. × cistenena ＇Pissardii＇ .