在ectomycorrhizal真菌Suillus物种的跨和内特异性金属耐受性变化
Jessica Fletcher1, Alexander Smith2, Amy Honan3
1Department of Integrative Biology, University of Colorado Denver, Denver, CO, USA. jessica.l.fletcher@ucdenver.edu.
Mycorrhiza
|July 22, 2024
概括
北美的一些Suillus真菌对和的耐受性有所变化. 对的耐受性,但不是,似乎与排除金属,而不是土壤污染水平有关.
科学领域:
- 菌类学 菌类学是指菌类学.
- 环境科学 环境科学
- 生态生态学 生态生态学
背景情况:
- 土壤金属污染对有机体构成风险,但一些真菌表现出金属耐受性.
- 菌真菌,像Suillus物种一样,对森林生态系统至关重要.
- 北美Suillus物种的金属耐受性变异在很大程度上仍未研究.
研究的目的:
- 在洛基山脉的Suillus brevipes和Suillus tomentosus中研究 (Cd) 和 (Zn) 的耐受性.
- 确定金属耐受性是否在这些Suillus物种内和之间存在差异.
- 探索土壤金属含量,真菌耐受性和金属积累之间的关系.
主要方法:
- 从科罗拉多州的地点收集了S. brevipes和S. tomentosus分离物,其金属含量各不相同.
- 在实验室条件下评估对Cd和Zn的分离耐受性.
- 耐受性和敏感性分离物的真菌组织中测量的金属含量.
主要成果:
- 在两种物种中都观察到Cd和Zn耐受性的显著 intra-和 inter-specific变化.
- 在土壤金属含量和真菌耐受性水平之间没有发现任何相关性.
- 耐 Zn 和 Zn 吸收之间的负相关性表明金属被排除在外.
- Cd耐受性与Cd积累没有相关性,这表明非排除机制.
结论:
- Suillus brevipes和S. tomentosus表现出相当大的金属耐受性变化,独立于当地土壤金属度.
- 这些物种的 Zn 耐受性主要通过排斥来调解.
- 这些物种的Cd耐受机制可能不涉及排斥,这需要进一步的遗传研究.
- 这项研究为了解Suillus金属耐受性及其生态影响的遗传基础提供了基础.
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