Discipline of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat, India; Department of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Israel.
FEMS Microbiol Ecol. 2014 May;88(2):213-30. doi: 10.1111/1574-6941.12297. Epub 2014 Mar 7.
Seaweed-associated bacteria play a crucial role in morphogenesis and growth of seaweeds (macroalgae) in direct and/or indirect ways. Bacterial communities belonging to the phyla Proteobacteria and Firmicutes are generally the most abundant on seaweed surfaces. Associated bacterial communities produce plant growth-promoting substances, quorum sensing signalling molecules, bioactive compounds and other effective molecules that are responsible for normal morphology, development and growth of seaweeds. Also, bioactive molecules of associated bacteria determine the presence of other bacterial strains on seaweeds and protect the host from harmful entities present in the pelagic realm. The ecological functions of cross-domain signalling between seaweeds and bacteria have been reported as liberation of carpospores in the red seaweeds and settlement of zoospores in the green seaweeds. In the present review, the role of extracellular polymeric substances in growth and settlement of seaweeds spores is also highlighted. To elucidate the functional roles of associated bacteria and the molecular mechanisms underlying reported ecological phenomena in seaweeds requires a combined ecological, microbiological and biochemical approach.
海藻相关细菌通过直接和/或间接的方式在海藻（大型藻类）的形态发生和生长中起着至关重要的作用。属于变形菌门和厚壁菌门的细菌群落通常在海藻表面最为丰富。相关细菌群落产生植物生长促进物质、群体感应信号分子、生物活性化合物和其他有效分子，这些物质负责海藻的正常形态、发育和生长。此外，相关细菌的生物活性分子决定了海藻上其他细菌菌株的存在，并保护宿主免受浮游生物领域中存在的有害实体的侵害。海藻和细菌之间跨域信号的生态功能已被报道为红海藻的果孢子释放和绿海藻的游动孢子附着。在本综述中，还强调了胞外聚合物物质在海藻孢子生长和附着中的作用。为了阐明相关细菌的功能作用和报道的海藻中生态现象的分子机制，需要结合生态学、微生物学和生物化学方法。
