In the past few years, a considerable decrease in growth and development of landscape plants was recorded, possibly due to chronic exposure to toxic pollutants, with dust probably playing a major role. In the current study, Murraya paniculata were grown in a greenhouse for a period of 4 months, during which roadside dust was sprinkled daily on the slightly damp leaves at different concentrations: T₀ (0 g/plant-control), T₁ (1 g/plant), T₂ (3 g/plant) and T₃ (5 g/plant). Roadside sediments were collected with a vacuum pump and passed through a filter to obtain a fine particle size (less than 800 μm). Phenotypic studies of leaves revealed that continuous addition of undesired dust effluents affects the foliar surface of the leaves and changes its morphology. Treatment with dust significantly increased the abscisic acid concentration of leaves and shoots and the effects were more severe in high level of dust treatments. Compared to control, chlorophyll, porphyrin, chlorophyllide and pheophytin contents were significantly decreased in the dust treated groups. In contrast, carotenoid and polar carotenoid contents were not influenced by dust (p > 0.05), while non-polar carotenoid contents were significantly reduced by different levels of dust treatments. This study concludes that roadside dust depositions have degradative effects on photosynthetic pigments, with extensive effects on growth and development of plants.

中文翻译：

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长期粉尘负荷对园林植物Murraya Paniculata叶片色素的影响

在过去的几年中，记录到园林植物的生长和发育显着下降，这可能是由于长期暴露于有毒污染物引起的，而粉尘可能起了主要作用。在本研究中，Murraya paniculata在温室中生长了4个月，在此期间，每天将路边灰尘撒在稍湿的叶子上，其浓度不同：T ₀  （0 g /植物对照），T ₁（1 g /株），T ₂（3 g /株）和T ₃（5克/植物）。用真空泵收集路边的沉淀物，并使其通过过滤器，以获得细粒度（小于800μm）。叶片的表型研究表明，不希望有的粉尘不断添加会影响叶片的叶面并改变其形态。粉尘处理显着提高了叶和芽的脱落酸浓度，在高水平的粉尘处理中效果更严重。与对照组相比，粉尘处理组的叶绿素，卟啉，叶绿素和脱镁叶绿素含量显着降低。相反，类胡萝卜素和极性类胡萝卜素的含量不受粉尘的影响（p > 0.05），而通过不同程度的粉尘处理可显着降低非极性类胡萝卜素的含量。这项研究得出的结论是，路边的灰尘沉积对光合色素具有降解作用，对植物的生长发育具有广泛的影响。