Comparative study of soil bacterial flora as influenced by the application of a pesticide,pentachlorophenol (PCP) |
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Authors: | Kyo Sato H Kato C Furusaka |
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Institution: | (1) Institute for Agricultural Research, Tohoku University, 980 Sendai, Japan;(2) Present address: Aichi complex experimental farm of agriculture, Aichi-prefecture, Nagakute;(3) Present address: Tsurugaya, Sendai, Japan |
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Abstract: | Summary The effects of pentachlorophenol (PCP) applications on the taxonomic composition of bacterial microflora were studied in water-logged
soil (WS) and in shake cultures of suspended soil (SS). PCP applications resulted in a predominancy of Gram-negative bacteria
over Gram-positive species. Members of theAcinetobacter group were the most common in PCP-treated soil although a small portion of the flora were in thePseudomonas-Alcaligenes group or belonged to theEnterobacteriaceae. Coryneform bacteria and species of theBacillus were the dominant forms in untreated WS; however, WS cultures treated with PCP at recommended rates (2.67 gm/m2) evidenced species ofPseudomonas, Alcaligenes, Acinetobacter, and members of theEnterobacteriaceae as the predominant bacterial species. The dominance of Gram-negative bacteria in PCP-treated soil was evidenced for 3 months
after application of the compound but was not evident after 17 months when PCP had dissipated. Gram-negative bacteria found
in PCP-treated soil were highly tolerant of the phenol. In WS cultures coryneform bacteria were the most common although PCP
tolerance was heterogenous in nature. |
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Keywords: | PCP-tolerance Pentachlorophenol Soil bacterial flora Soil suspension Water-logged soil |
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