Joshi P C, Swami Abhishek
Department of Zoology and Environmental Sciences, Gurukul Kangri University, Haridwar, India.
J Environ Biol. 2009 Mar;30(2):295-8.
Changes in the concentration of different photosynthetic pigments (Chlorophyll and carotenoids) were determined in the leaves of six tree species exposed to air pollution due to vehicular emissions. The six tree species, which are all economically important because of their being fruit bearers, used for timber fodder and as road side trees on the basis of their air pollution tolerance index. These included Mangifera indica L., Tectona grandis Linn.f , Shorea robusta Gaertn.f., Holoptelea integrifolia (Roxb.) Planch, Eucalyptus citridora Hook. Syn. and Mallotus philippinensis Muell-Arg. Reduction in chlorophyll 'a', 'b' and carotenoid was recorded in the leaf samples collected from polluted areas when compared with samples from control areas. The highest reduction in total chlorophyll was observed in Holoptelea integrifolia (Roxb.) (48.73%) Planch whereas, the lowest reduction (17.84 %) was recorded in Mallotus philippinensis Muell-Arg. Similarly in case of carotenoid contents, highest reduction (43.02%) was observed in Eucalyptus citridora, and lowest in Mallotus philippinensis Muell-Arg (19.31%). The data obtained were further analyzed using one-way ANOVA and a significant change was recorded in the studied parameters. These studies clearly indicate that the vehicular induced air pollution reduces the concentration of photosynthetic pigments in the trees exposed to road side pollution.
测定了六种因车辆排放而暴露于空气污染中的树种叶片中不同光合色素（叶绿素和类胡萝卜素）浓度的变化。这六种树种均具有重要经济价值，因其为结果实的树种，基于其耐空气污染指数可用于木材饲料以及作为路边树。这些树种包括芒果（Mangifera indica L.）、柚木（Tectona grandis Linn.f）、娑罗双（Shorea robusta Gaertn.f.）、全缘叶牛筋树（Holoptelea integrifolia (Roxb.) Planch）、柠檬桉（Eucalyptus citridora Hook. Syn.）和红背桂（Mallotus philippinensis Muell-Arg）。与对照区样本相比，从污染区采集的叶片样本中叶绿素“a”、“b”和类胡萝卜素含量均有所降低。全缘叶牛筋树（Holoptelea integrifolia (Roxb.) Planch）中总叶绿素含量降低最多（48.73%），而红背桂（Mallotus philippinensis Muell-Arg）中降低最少（17.84%）。同样，在类胡萝卜素含量方面，柠檬桉（Eucalyptus citridora）中降低最多（43.02%），红背桂（Mallotus philippinensis Muell-Arg）中降低最少（19.31%）。对所得数据进一步进行单因素方差分析，研究参数记录到显著变化。这些研究清楚地表明，车辆排放导致的空气污染降低了暴露于路边污染的树木中光合色素的浓度。
