Root colonization and effect of biocontrol fungus Paecilomyces lilacinus on composition of ammonia-oxidizing bacteria, ammonia-oxidizing archaea and fungal populations of tomato rhizosphere
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- 作者：Zhen Yu ; Youchi Zhang ; Wensui Luo ; Yin Wang
- 关键词：Paecilomyces lilacinus ; Colonization ; Ammonia oxidizers ; Fungal community composition
- 刊名：Biology and Fertility of Soils
- 出版年：2015
- 出版时间：April 2015
- 年：2015
- 卷：51
- 期：3
- 页码：343-351
- 全文大小：702 KB
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文摘
This study investigated the effects of root-knot nematode biocontrol agent Paecilomyces lilacinus (P. lilacinus) strain PL1210 on ammonia-oxidizing microorganisms and fungal community composition of tomato rhizosphere. The exchangeable NH4 +-N and NO3 ?/sup>-N contents were lower in inoculated soils than in the control during 60?days of incubation. Real-time quantitative polymerase chain reaction (qPCR) detected stable colonization of P. lilacinus in the tomato rhizosphere and significant inhibition of ammonia-oxidizing bacteria (AOB) and archaea (AOA), which could be responsible for the decrease of NO3 ?/sup>-N content in soil. PCR-denaturing gradient gel electrophoresis (DGGE) analysis demonstrated no significant difference in soil fungal community composition associated with the application of P. lilacinus as shown by Shannon–Wiener diversity index (H-/em>) and Margalef index (D). Cluster analysis showed that the composition of rhizosphere fungal community was more significantly influenced by time-related differences than by the inoculation of biocontrol agents.