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首页> 外文期刊>Environmental toxicology and chemistry >SYNERGISTIC EFFECT OF FLYASH AND SO_2 ON DEVELOPMENT OF CUCUMBER (CUCUMIS SATIVUS L.) LEAF INJURY
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SYNERGISTIC EFFECT OF FLYASH AND SO_2 ON DEVELOPMENT OF CUCUMBER (CUCUMIS SATIVUS L.) LEAF INJURY

机译：粉煤灰和SO_2对黄瓜叶片伤害的协同效应

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摘要

In a two-factorial experiment, sulfur dioxide alone at concentration of 131 μg/m~3 over long exposures or flyash from either coal or oil combustion alone applied onto cucumber (Cucumis sativus L.) foliage causes no visible injury. However, if both flyash and sulfur dioxide were presented simultaneously, a specific mosaic-chlorosis symptom developed on leaves. A syn-ergistic effect was thus demonstrated. Histopathology of the mosaic-chlorosis symptom was studied. An unusual pattern of tissue abnormally initiated from the collapse of the anticlinal cell walls of the upper epidermal cells and progressed along cell walls into mesophyll tissues. Cellular injury at the lower spongy tissues typical of that caused by SO_2 was also observed. A significant elevation of sulfate-sulfur in the leaves treated with a combination of SO_2 and flyash was demonstrated. Significant interactions between the two factors were found for both injury and sulfur chemistry. This suggests that flyash deposits on the leaf surface play a catalytic role in oxidizing atmospheric sulfur dioxide continuously to form sulfuric acid (H_2SO_4) in situ. This acid could infiltrate into mesophyll damage cells and tissues en route.
机译：在两因素试验中，长时间暴露在浓度为131μg/ m〜3的二氧化硫或仅将煤或油燃烧的粉煤灰单独施用到黄瓜（Cucumis sativus L.）叶子上不会造成可见伤害。但是，如果同时存在粉煤灰和二氧化硫，则在叶子上会出现特定的镶嵌绿化症状。因此证明了协同作用。研究了镶嵌绿化症状的组织病理学。异常的组织异常模式是由上表皮细胞的抗角质层细胞壁塌陷而异常引发的，并沿着细胞壁发展成叶肉组织。还观察到下部海绵状组织的细胞损伤是典型的由SO_2引起的。结果表明，用SO_2和粉煤灰混合处理后的叶片中硫酸盐硫含量显着升高。在伤害和硫化学方面，发现了两个因素之间的显着相互作用。这表明叶片表面的粉煤灰沉积物在连续氧化大气中的二氧化硫以原位形成硫酸（H_2SO_4）方面起催化作用。该酸可能在途中渗透到叶肉损伤的细胞和组织中。

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