| Title |
Diversity and Metal Tolerance of Nematode-Trapping Fungi in Pb-Polluted Soils |
| Author |
Ming-He Mo1, Wei-Min Chen1, Hao-Ran Yang2, and Ke-Qin Zhang1* |
| Address |
1Laboratory for Conservation and Utilization of Bio-resources, and Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming 650091, P. R. China, 2School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, P. R. China |
| Bibliography |
Journal of Microbiology, 46(1),16-22, 2008,
|
| DOI |
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| Key Words |
Nematode-trapping fungi, Pb toxicity, heavy metal tolerance |
| Abstract |
The diversity of nematode-trapping fungi (NTF) in two lead (Pb) mines in Yunnan Province, China was investigated in 2004. In total, 20 species belonging to five genera were identified from 500 samples collected at the Lanping and the Huize mines. Pb concentrations ranged from 216~7,150 mg/kg for the former and 132~13,380 mg/kg for the latter, respectively. The fungi were divided into five groups based on different trapping mechanisms. The trapping-net producer group contained the largest number of species, with nine. Two predators, Dactylellina ellipsosporum and Arthrobotrys oligospora, were found at frequencies of 32.85% and 15.41%, respectively. The diversity indexes of NTF were positively correlated with Pb pollution levels in both the Lanping Mine (r=0.66) and the Huize Mine (r=0.72), suggesting that the distribution of NTF was not negatively affected by Pb contamination. For most strains of a given species, there was no significant difference (P>0.01) in the Pb tolerance between the strains isolated from habitats with low or high Pb concentrations. However, Pb toxicity exerted adverse effects on trap formation and predacious capability of fungi. We discuss the possible metal tolerance mechanisms and their relationships to the survival strategy of NTF in Pb-polluted environments. |
