Endosymbiotic sulphate-reducing and sulphide-oxidizing bacteria in an oligochaete worm
Endosymbiotic sulphate-reducing and sulphide-oxidizing bacteria in an oligochaete worm
复制标题
DOI：
10.1038/35077067
复制
发表时间：
2001-05-17
期刊：
影响因子：
64.8
通讯作者：
Amann, R
中科院分区：
文献类型：
--
作者：
Dubilier, N;Mülders, C;Amann, R
在一个单一的宿主细胞或组织中，一个以上物种的共生体的稳定协会被认为是罕见的后生动物，因为共生体之间的空间和资源竞争可能对宿主有害（1）。在具有多种内共生体的动物中，例如深海热液喷口的贻贝（2）和造礁珊瑚（3），共生体之间竞争的代价被宿主获得的生态和生理灵活性所抵消。多个共生体在宿主内共存的另一个选择是如果这些共生体直接从彼此受益，但是这样的共生体之前没有描述过。在这里，我们表明，在肠道海洋寡毛类Olavius algarvensis，内共生硫酸盐还原菌产生硫化物，可以作为一种能源的硫化物氧化共生体的主机。因此，这些共生体不竞争资源，而是在内共生硫循环中彼此共享mutalistic关系，除了它们与寡毛类宿主的共生关系之外。
Stable associations of more than one species of symbiont within a single host cell or tissue are assumed to be rare in metazoans because competition for space and resources between symbionts can be detrimental to the host(1). In animals with multiple endosymbionts, such as mussels from deep-sea hydrothermal vents(2) and reef-building corals(3), the costs of competition between the symbionts are outweighed by the ecological and physiological flexibility gained by the hosts. A further option for the coexistence of multiple symbionts within a host is if these benefit directly from one another, but such symbioses have not been previously described. Here we show that in the gutless marine oligochaete Olavius algarvensis, endosymbiotic sulphate-reducing bacteria produce sulphide that can serve as an energy source for sulphide-oxidizing symbionts of the host. Thus, these symbionts do not compete for resources but rather share a mutalistic relationship with each other in an endosymbiotic sulphur cycle, in addition to their symbiotic relationship with the oligochaete host.