生物技术通报 ›› 2016, Vol. 32 ›› Issue (6): 205-210.doi: 10.13560/j.cnki.biotech.bull.1985.2016.06.030

• 研究报告 • 上一篇    下一篇

土壤中木霉的分离及其对毒死蜱降解特性研究

张广志, 张新建, 李红梅, 郭凯, 杨合同   

  1. 山东省科学院生态研究所 山东省应用微生物重点实验室,济南 250014
  • 收稿日期:2015-09-30 出版日期:2016-06-27 发布日期:2016-06-28
  • 作者简介:张广志,男,助理研究员,研究方向:农业微生物资源挖掘及应用;E-mail:zhanggzh@sdas.org
  • 基金资助:
    山东省科技发展计划(2014GSF121028,2013GNC11019),国家科技基础性工作专项(2014FY120900)

Isolation and Characterization of the Chlorpyrifos-degrading Trichoderma Strains from the Vegetable Soil in Greenhouse

ZHANG Guang-zhi, ZHANG Xin-jian, LI Hong-mei, GUO Kai, YANG He-tong   

  1. Institute of Ecology,Shandong Academy of Sciences,Shandong Provincial Key Lab for Applied Microbiology,Jinan 250014
  • Received:2015-09-30 Published:2016-06-27 Online:2016-06-28

摘要: 为挖掘保护地土壤中的能降解毒死蜱的木霉资源,从长期污染的土壤中共分离6个不同木霉菌株,通过形态学特征和ITS rDNA序列对各菌株进行鉴定,6个菌株分别为哈茨木霉(Trichoderma harzianum)、绿色木霉(T. viride)、康宁木霉(T. koningii)、拟康宁木霉(T. koningiopsis)、长枝木霉(T. longibrachiatum)和短密木霉(T. brevicompactum)。选择降解活性最高的长枝木霉TC5菌株,测定各种条件下对毒死蜱的降解特性。结果表明,木霉TC5在中性或偏碱性条件下对毒死蜱具有更好的降解活性;添加碳源或提高木霉的接种浓度,能提高对毒死蜱的降解活性;在50-300 mg/L范围内,随毒死蜱浓度升高,木霉的降解活性也明显提高。盆栽试验中木霉TC5对毒死蜱保持较强的降解活性,但在自然土壤中降解活性显著低于在灭菌土壤中。分离的木霉菌株在土壤农药污染修复方面具有应用开发潜力。

关键词: 木霉, 毒死蜱, 生物降解

Abstract: To explore and protect the Trichoderma resources that can degrade chlorpyrifos,six different types of Trichoderma strains with high activity of degrading chlorpyrifos were screened from the long-term organophosphorus pesticide contaminated soil. Analyses of morphological characteristics combined with internal transcribed spacer(ITS)rDNA sequences were used to identify them as T. harzianum, T. viride, T. koningii, T. koningiopsis, T. longibrachiatum,and T. brevicompactum,respectively. T. longibrachiatum TC5 with the highest degradation activity was selected to investigate the characterization of degrading chlorpyrifos under the culture condition including extra carbon source,pesticide concentration,inoculum density and pH. Under neutral or alkaline conditions,the strains TC5 had solid degradation activity to chlorpyrifos. Either adding carbon or increasing the inoculum concentration promoted the degradation rate. Degradation activity gradually increased with the increasing of chlorpyrifos concentration in the range of 50-300 mg/L. In the pot experiment,Trichoderma TC5 remained the high degradation activity to chlorpyrifos,but the degradation activity in the natural soil was significantly lower than in sterilized soil. The Trichoderma strains have great potential application in remedying the pesticide-contaminated soil.

Key words: Trichoderma, chlorpyrifos, biodegradation