圣巴巴拉盆地是一个共生绿洲
J M Bernhard1, K R Buck, M A Farmer
1Department of Environmental Health Sciences, School of Public Health, University of South Carolina, Columbia 29208, USA. jmbernha@sph.sc.edu
Nature
|January 19, 2000
概括
早期的生命可能在深水,低氧水域多样化. 现代的二氧化沉积物揭示了丰富的,新型的真核生物群落,其中许多与 prokaryotic 共生体,提供了对真核生成的见解.
科学领域:
- 欧卡利亚的起源和多样化
- 在毒性环境中早期生命的演化.
背景情况:
- 细胞的起源很可能发生在古代/新生代的低氧,高紫外线辐射条件下.
- 深水环境为紫外线辐射提供了避难所,这表明早期真核生物多样化的排毒环境.
- 化石证据表明,在这个时期存在深海微生物.
研究的目的:
- 在早期地球的毒毒环境的现代模拟中研究真核社区.
- 探索共生在早期真核生物进化中的潜在作用.
- 识别新型种类并了解二氧化沉积物中的微生物社区结构.
主要方法:
- 研究了圣巴巴拉盆地的真核生物群落,这是一个有毒和硫化海洋环境.
- 分析了微生物地毯,特别是那些由贝吉阿托亚样细菌主导的.
- 描述了原生动物和元生动物的中间动物群体,并指出了原生生物共生体.
主要成果:
- 在贝吉阿托瓦地毯中发现了一个令人惊的丰富多样化的原生态和生物群体.
- 识别了许多新的真核生物种群,包括微气友和厌氧成员.
- 观察到大多数真核细胞种群都拥有 prokaryotic 协生体,这表明一个"共生绿洲".
结论:
- 现代的二氧化环境,如圣巴巴拉盆地,拥有丰富的真核生物,反映了地球早期的潜在条件.
- 在这种环境中共生的普遍性支持了将共生与真核细胞生成联系起来的假设.
- 这种生态系统为研究真核生物的起源和多样化提供了有价值的模型.
相关概念视频
Bioremediation
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
Symbiosis
Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
Ecological Niches
All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.Multiple species cannot occupy the exact same niche within their habitat. If the niches of two or more species overlap to a large extent, the competitive exclusion principle dictates that one species will outcompete the other, forcing it to...
The Soil Ecosystem
Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
Rab Cascades
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
Microbial Interactions: Mutualism
Mutualism is a symbiotic interaction in which all participating organisms benefit. These relationships can be obligate or facultative and are fundamental to ecosystem functions across diverse biological systems.Plant–Fungi MutualismOne well-known example is the association between plant roots and mycorrhizal fungi, such as Rhizophagus species. The fungal hyphae penetrate the root hairs and the epidermis, forming an extensive hyphal network that establishes a symbiotic association. Through this...


