国际植物浮游生物和相关细菌之间的相互作用和信号传递
S A Amin1, L R Hmelo2, H M van Tol3
11] School of Oceanography, University of Washington, Seattle, Washington 98195, USA [2] Chemistry Faculty, New York University Abu Dhabi, PO Box 129188, Abu Dhabi, United Arab Emirates.
Nature
|May 29, 2015
概括
海洋藻和细菌参与营养物质的交换,细菌利用激素英多尔-3-酸促进藻生长. 这一发现揭示了海洋生态系统中复杂的微生物信号.
科学领域:
- 海洋微生物学 海洋微生物学
- 植物浮游生物-细菌相互作用
- 生物地质化学循环是什么
背景情况:
- 海洋微生物群落,特别是植物浮游生物-细菌联盟,显著影响海洋生态系统.
- diatoms,主要的初级生产者,与特定的细菌相互作用,但机制在很大程度上是未知的.
- 了解这些相互作用对于海洋食物网和生物地化学循环研究至关重要.
研究的目的:
- 阐明全球分布的藻及其相关细菌联盟之间的相互作用机制.
- 为了确定特定的细菌物种和分子调解藻生长和营养交换.
- 评估这些信号通路在海洋环境中的流行程度.
主要方法:
- 一个藻-细菌联盟的培养.
- 代谢物分析以确定交换的化合物.
- 转基因组分析用于研究基因表达.
- 激素量化和合成途径的研究.
主要成果:
- 一种Sulfitobacter物种被确定为促进藻细胞分裂.
- 通过使用藻分泌和内源性三,细菌的英多尔-3-酸 (IAA) 生产被证实是促进生长的机制.
- 观察到一个复杂的营养物质交换,涉及藻分泌的有机硫化合物和细菌氨.
- 在沿海环境中检测到与硫杆菌相关的细菌广泛产生IAA.
结论:
- 海洋藻-硫菌相互作用是由信息化学物质,特别是IAA,促进营养物质交换和促进藻生长的介导.
- 这项研究强调了激素信号在构建海洋微生物群落中的作用.
- 这些发现表明,这种基于信息化学的相互作用在沿海海洋生态系统中普遍存在,影响初级生产和食物网.
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