Microbial Decomposition of s-Triazine Herbicides, Atrazine and Simazine by a TNT-degrading Bacterium

TNT-분해세균에 의한 s-Triazine계 제초제인 Atrazine과 Simazine의 미생물학적 분해

  • 오계헌 (순천향대학교 자연과학대학 생명과학부) ;
  • 이명석 (순천향대학교 자연과학대학 생명과학부) ;
  • 장효원 (순천향대학교 자연과학대학 생명과학부) ;
  • 소재성 (인하대학교 생물공학과)
  • Published : 2000.09.01

Abstract

The purpose of U7is work was to iilvestigate the degradation of s-h~azine hel-hicidcs, ahilzine and simazine by TNT-degrader under several relevaut physicochemical environ~nental parameters. TNT-degrader showed effective degradability of atrazine and snnazine as well. Both atrazme (GO 1i1~11) and simazine ( 4 5 rng//) were completely degraded within 30 hrs and 4 days of incubation, respectively. As d ~ e concentrations of atrazine and sunazine increased in the media, the degradation ofthose compounds were delayed. Additional caubans were essential to degrade atrazine and simazule, and no degradation was achieved in the absence of additional carbons. The effect of supplemented nitrogens on the degradation of atrazine and sunazine was evalualed. Addition of a suppleinented nitrogen in he growth medium containing ah-azine or siinazine showed partial degr-adation olihose herbicides duriug the incubation period. However, complete degradation of atrazine and simazu~e was examined ul the absence or any supplemented nitrogens. Addltion of yeast extract in this study was inhibilory to atrazine aud siinazine degradations, respectively. TNT-degrader was a small Gram-negative cocco-bacillus. Physiological analysis using BIOLOG sysleln revealed that this strain was Ste~~ol~~opl~orno~~ns rrialtophilia.

이연구는 물리화학적 환경요인에 따른 TNT 분해 세균에 의한 s-triazine 계열의 atrazine과 simazine의 분해를 조사하기 위하여 실시되었다. TNT 분해세균은 atrazine과 simazine에 대해서도 높은 분해능을 나타내었다. Atrazine(<50 mg/l)과 simazine(<15 mg/l) 은 각각 30시간과 4일의 배양기간중에 완전히 분해되었다. 배양내에서 atrazine과 simazine 의 농도가 증가함에 따라 이들의 분해는 지연되었다. 부가 탄소원은 atrazine과 simazine의 분해를 위하여 필수적이었으며 부가 탄소원이 없는 상태에서는 분해되지 않았다. Atrazine 과 simazine의 분해에서 부가 질소원의 효과에 대하여 조사하였다. Atrazine이나 simazine을 포함하는 생장배지에 부가 질소원이 첨가된 뱅야에서 배양기간동안 이들 제초제는 일부만 문해되었다. 그러나 부가 질소원이 첨가되지 않은 배양에서 atrazine과 simazine은 완전히 분해되지 않았다. 이 연구에서 효모추출물의 첨가는 atrazine과 simazine의 분해를 억제하였 다. TNT 분해세균은 작은 그람 음성의 간균이었다. BIOLOG system을 이용한 생리학적 분 석으로 이 균주는 Stenotrophomonas maltophilia로 동정되었다.

Keywords

References

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