在红树林沉积物中地下甲基剂的植物遗传学和生态生理学新奇性
Songfeng Liu1, Ruiwen Hu1, Nenglong Peng1
1Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou, 510006, China.
The ISME journal
|October 25, 2023
概括
红树林地下沉积物中含有多种甲基剂,包括新型菌株,如Zixibacteria,它们具有独特的代谢适应性,可以在无毒环境中产生甲基.
科学领域:
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
- 海洋科学 海洋科学
背景情况:
- 红树林沉积物是全球重要的 (Hg) 循环热点,特别是用于甲基 (MeHg) 生产.
- 现有的研究集中在表面沉积物上,使Hg甲基化剂的多样性和适应性在更深的无氧地下沉积物中受到研究.
研究的目的:
- 研究在红树林地下沉积物中的甲基化剂的多样性和代谢策略.
- 在无毒环境中识别涉及甲基化的新型微生物系.
主要方法:
- 甲基生物地质化学测定.
- 在1500公里区域内,在不同深度 (0-100厘米) 的红树林沉积物的元基因组测序.
- 生物信息分析以确定Hg甲基化微生物血统及其代谢途径.
主要成果:
- 地表沉积物 (20-100厘米) 的hgcA基因丰度较低,但与表面沉积物 (0-20厘米) 相比,Hg甲基剂的多样性更高.
- 在地下沉积物中发现了包括Anaerolineae,Phycisphaerae,Desulfobacterales和候选属Zixibacteria在内的新型Hg甲基化系.
- 锡西细菌系,一种硫酸盐降解剂,通过 metionin 合成甲基化 Hg,而不是 Wood-Ljungdahl 途径,并且可能依赖于合成的合作伙伴来获得能量.
结论:
- 红树林中地下Hg甲基剂的多样性比以前知道的要大.
- 新型的微生物系,如Zixibacteria,具有独特的生态生理学适应性,用于无氧海洋沉积物中的Hg甲基化.
- 了解这些地下甲基剂对于全面了解沿海生态系统中的循环至关重要.
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