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《Shanghai Environmental Sciences》 2010-04
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Toxicological Effect of Gaseous Formaldehyde Contamination on Chlorophytum comosum Growth

Han Xiaodi(Marine College,Shandong University at Weihai,Weihai 264209)  
The toxicological effect of gaseous formaldehyde contamination on growth of Chlorophytum comosum,an indoor foliage plant,was discussed.A standard aqueous solution containing 8.0 mg/mL of formaldehyde was prepared.Based on the volume of test containers,certain amount of the aqueous formaldehyde solution was injected to keep volatile formaldehyde content in the headspace steadily at levels of 2.0,4.0,6.0 and 8.0 mg/m~3,respectively.Chlorophytum comosum was then put inside the test containers to expose to gaseous formaldehyde for 15 successive days while the solution in the test containers renewed every day.In addition,the plant exposed to air was taken as a control group.Activity of catalase(CAT),permeability of plasmolemma,chlorophyll content of the leaves,as well as the response of leaf morphology to the gaseous formaldehyde contamination were measured by means of potassium permanganate titration,electric conductance, spectrophotometry,and so on.No significant damage has been observed in the leaf appearance,and the chlorophyll content did not change greatly in the leaves exposed to formaldehyde while showing depressed trend slightly(P = 0.483~0.022).Compared with the control group,however,there occurred a distinct reduction in the activity of catalase in the leaves(P = 0.009),and so did an obvious increase in the cell membrane permeability (P = 0.009).As the leaf morphological impairment and chlorophyll content were not obviously affected by the gaseous formaldehyde contamination,it seemed that Chlorophytum comosum possessed resistance to certain level of gaseous formaldehyde.In the stress of formaldehyde,the activity of catalase within Chlorophytum comosum blade cell would be inhibited remarkably,and the permeability of plasmolemma augmented distinctly. In conclusion,CAT activity and plasmolemma permeability could be served as physiological indication in response to gaseous formaldehyde contamination reaction.
【Fund】: 山东大学威海分校教研项目资助 编号:1070509420002
【CateGory Index】: X503.233
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