Effects of Soil Temperature and Anaerobiosis on Degradation of Biodegradable Plastics in Soil and Their Degrading Microorganisms

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概要

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• The bioplastic PHB/HV (copolymer of 3-hydroxybutyrate and 3-hydroxyvalerate) underwent a faster degradation at 30℃ than at 52℃ in soil under aerobic conditions, while there was no remarkable difference between 30℃ and 52℃ in the degradation rate of PCL [poly(ε-caprolactone)], PBSA (polybutylene succinate and agipate), and PBS (polybutylene succinate). PHB showed the fastest degree of degradation among the four plastics at 30℃ and PBSA the fastest at 52℃. Degradation of all the four plastics was nor observed both at 30℃ and 52℃ under anaerobic conditions for 50 d. Microorganisms on the degrading plastics appeared to be diverse at 30℃, including bacteria and fungi. However, among the several to ca. 10 kinds of bacterial and fungal strains isolated from the degradation sites of each plastic at 30℃, only one or two fungal strains were able to degrade the respective plastics in vitro. The degraders were identified as Mucor sp. (PHB), Paecilomyces sp. (PCL), Aspergillus sp. (PBSA), and Cunninghamella sp. (PBSA). In contrast, only a single type of fungus was observed at the degradation sites of PCL and PBSA at 52℃. The fungus isolated from PCL and PBSA was identified as Thermomyces sp. This study demonstrated that soil temperature and anaerobiosis exerted significant effects on the degradation of the plastics, and that fungi were mainly responsible for the degradation of the plastics in soil.

• 社団法人日本土壌肥料学会の論文

著者

• KIMURA Makoto

  Laboratory of Structural Biology, Graduate School of Systems Life Sciences, Kyushu University

• Toyota Koki

  Laboratory Of Soil Biology And Chemistry School Of Agricultural Sciences Nagoya University

• Toyota Koki

  Laboratory Of Soil Biology And Chemistry Graduate School Of Bioagricultural Sciences Nagoya Universi

• Nishide H

  Laboratory Of Soil Biology And Chemistry Graduate School Bioagricultural Sciences Nagoya University:

• Nishide Hiroyo

  Laboratory of Soil Biology and Chemistry, Graduate School Bioagricultural Sciences, Nagoya Universit

• Toyota Koki

  Laboratory Of Soil Biology And Chemistry Graduate School Bioagricultural Sciences Nagoya University

• Kimura Makoto

  Laboratory Of Biochemistry Department Of Bioscience And Biotechnology Graduate School Faculty Of Agr

• Kimura Makoto

  Laboratory Of Biochemistry Department Of Bioscience And Biotechnology Faculty Of Agriculture Graduat

• Kimura Makoto

  Laboratory Of Soil Biology And Chemistry Graduate School Bioagricultural Sciences Nagoya University

• Kimura Makoto

  Laboratory Of Biochemistry Department Of Agricultural Chemistry Faculty And Graduate School Of Agric

• KIMURA Makoto

  Laboratory for Remediation Research, Plant Science Center, RIKEN

• Hishide Hiroyo

  Laboratory of Soil Biology and Chemistry, Graduate School Bioagricultural Sciences, Nagoya University

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