摘要
菌藻化感作用是一种极其复杂的生理、生态学现象.从虾蟹混养池分离得到1株海洋细菌,经16S rRNA序列比对确定为Marinobacter adhaerens HY-3,选择我国常见赤潮优势种中肋骨条藻(Skeletonema costatum)作为对象,研究海洋细菌与其种间化感效应,利用共培养和添加细菌胞外代谢物,以S.costatum生长量及叶绿素a含量为参数,研究细菌对S.costatum生长及光合作用的影响.结果表明,菌液浓度104以上对S.costatum生长产生抑制,培养至第10 d,104、106、108组藻生长量分别是对照组的70%、23%、22%;叶绿素合成量是对照组88%、62%、60%;抑制效应随菌浓度的增加有逐渐增加的趋势.添加细菌胞外代谢物,对S.costatum生长无影响;因此,M.adhaerens HY-3对S.costatum存在一定的化感作用,对其生长及光合作用均产生较大的影响;S.costatum与M.adhaerens HY-3的种间相互作用,是由菌藻细胞的直接接触进行,代谢物不存在化感作用因子.
The allelopathy between bacteria and algae is a very complicated physical and ecological phenomenon.A marine bacterium was isolated from the water of a shrimp and crab mix-culturing pond.By 16S rRNA analysis,it was identified as Marinobacter adhaerens HY-3.Skeletonema costatum,a common dominant species of red-tide microorganism in China,was chosen as the other research object.The allelopathic effect of Marinobacter adhaerens HY-3 on S.costatum was studied.Using the growth mass of Skeletonema costatum and the content of chlorophyll a as the parameters,the effects of HY-3 on the growth and photosynthesis of Skeletonema costatum were studied after co-cultivation and addition of extracellular metabolites of HY-3.The results showed that the growth of S.costatum was inhibited when the concentration of the strain HY-3 was above 104,and the growth mass of the 104,106 and 108 HY-3 group was 70%,23% and 22% of the control group respectively on the 10th day,with the content of chlorophyll being 88%,62% and 60% of the control group,respectively.Therefore,the suppression increased with increasing concentration of HY-3.However,addition of extracellular metabolites of HY-3 had no effect on the growth of S.costatum.Conclusions： M.adhaerens HY-3 had certain allelopathy on S.costatum and affected its growth and photosynthesis.Moreover,interaction between M.adhaerens HY-3 and S.costatum was achieved by their direct contact and the extracellular metabolites did not contain allelopathy factors.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第1期145-149,共5页
Environmental Science
基金
科技部"十二五"科技支撑计划项目(2011BAD13B03)
