Marshall Katrina, Joint Ian, Callow Maureen E, Callow James A
School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
Microb Ecol. 2006 Aug;52(2):302-10. doi: 10.1007/s00248-006-9060-x. Epub 2006 Aug 2.
The green marine macroalga, Ulva linza, adopts an "atypical" form when grown in the absence of bacteria. Twenty unique strains of periphytic bacteria, isolated from three species of Ulva, were identified by 16S rDNA sequencing. These isolates were assessed for their effect on the growth and morphological development of axenic plantlets of U. linza. Results showed that the effect of bacterial strains was strain- but not taxon-specific. Thirteen isolates returned the aberrant morphology to normal and of these, five also significantly increased growth rate. One isolate increased growth, but had no effect on morphology. Biofilms of some of these isolates stimulated the settlement of Ulva zoospores but there was no correlation between bacterial isolates that stimulated zoospore settlement and those that initiated changes in morphology and/or growth of the cultured alga.
绿色海洋大型藻类石莼（Ulva linza）在无细菌环境中生长时会呈现出“非典型”形态。通过16S rDNA测序鉴定了从三种石莼中分离出的20株独特的附生细菌菌株。评估了这些分离菌株对无菌石莼幼苗生长和形态发育的影响。结果表明，细菌菌株的影响具有菌株特异性而非分类群特异性。13株分离菌株使异常形态恢复正常，其中5株还显著提高了生长速率。一株分离菌株促进了生长，但对形态没有影响。其中一些分离菌株的生物膜刺激了石莼游动孢子的附着，但刺激游动孢子附着的细菌分离菌株与引发培养藻类形态和/或生长变化的菌株之间没有相关性。
