铝对海洋固氮蓝藻Crocosphaera watsonii生长及固氮速率的影响
作者简介:刘甲星(1986—), 男, 博士研究生, 主要从事海洋生态学研究。E-mail: ljx2ljx@163.com
收稿日期: 2016-07-25
要求修回日期: 2016-08-31
网络出版日期: 2017-04-06
基金资助
国家重点基础研究发展规划(“973”计划)(2015CB4529000、2015CB452903)
国家自然科学基金项目(41276162、41506150)
中国科学院战略先导专项 (XDA11020200)
公益性行业(农业)科研专项(201403008)
广东省科技计划项目(2014B030301064)
Effect of aluminum on the growth and nitrogen fixation of a marine nitrogen-fixing cyanobacterium: Crocosphaera watsonii
Received date: 2016-07-25
Request revised date: 2016-08-31
Online published: 2017-04-06
Supported by
National Program on Key Basic Research Project (“973” Program)(2015CB4529000, 2015CB452903)
National Science Foundation of China (41276162, 41506150)
Strategic Priority Research Program of the Chinese Academy of Sciences (XDA11020200)
Special Fund for Agro-scientific Research in the Public Interest (201403008)
Science and Technology Planning Project of Guangdong Province (2014B030301064)
Copyright
大气沉降向海洋表层输入大量的铝, 然而关于铝对海洋浮游植物的影响却少有研究报道。目前, 铝对在海洋碳和氮循环中起着重要作用的固氮生物影响的研究还较少。文章以Aquil培养基(无氮硅营养盐)半连续培养单细胞海洋固氮蓝藻Crocosphaera watsonii, 利用流式细胞技术和15N同位素示踪法, 研究铝(0、0.2、2和20μmol•L-1)对Crocosphaera watsonii生长和固氮作用的影响。数据表明, 3个铝处理组Crocosphaera watsonii细胞大小、光合色素含量和光系统Ⅱ(PSⅡ)原初光能转化效率(Fv/Fm)都显著降低, 生长速率和固氮速率明显受到抑制。结果表明, 在营养充足条件下, 铝对Crocosphaera watsonii生长和固氮具有抑制性作用。
关键词: 铝; 固氮蓝藻; Crocosphaera watsonii; 生长速率; 固氮
刘甲星 , 周林滨 , 柯志新 , 李刚 , 史荣君 , 谭烨辉 . 铝对海洋固氮蓝藻Crocosphaera watsonii生长及固氮速率的影响[J]. 热带海洋学报, 2017 , 36(2) : 12 -18 . DOI: 10.11978/2016069
Although a large amount of aluminum enters the ocean through atmospheric dust deposition every year, the effect of aluminum on marine phytoplankton is seldom examined. Few studies focused on the effects of aluminum on marine nitrogen-fixing cyanobacteria, which play important roles in nitrogen and carbon cycling in the ocean. In this study, a unicellular marine nitrogen-fixing cyanobacterium Crocosphaera watsonii grew in Aquil medium without silicate and nitrogen by semi-continuous cultures. We studied the effect of aluminum (0, 0.2, 2 and 20 μmol•L-1) on the growth rate and nitrogen fixation rate of Crocosphaera watsonii by using flow cytometry and 15N isotope tracer method. Results showed that aluminum inhibited the growth and nitrogen fixation of Crocosphaera watsonii. Results also showed that cell size, cellular pigments and photochemical efficiency of photosystem II (Fv/Fm) of Crocosphaera watsonii treated with aluminum were significantly decreased. These results demonstrate that aluminum has an inhibitory effect on the growth and nitrogen fixation of Crocosphaera watsonii under the condition of sufficient phosphate and trace nutrients.
Fig. 1 Effect of aluminium on the growth rate of Crocosphaera watsonii. Different letters represent statistically significant differences at p < 0.05图1 铝对Crocosphaera watsonii生长速率的影响 |
Fig. 2 Effect of aluminium on the nitrogen fixation rate of Crocosphaera watsonii图2 铝对Crocosphaera watsonii固氮速率的影响 |
Fig. 3 Effect of aluminium on Fv/Fm of Crocosphaera watsonii图3 铝对Crocosphaera watsonii Fv/Fm比值的影响 |
Fig. 4 Effect of aluminium on FL3 (a), FL2 (b), FSC (c), and SSC fluorescence (d) of Crocosphaera watsonii图4 铝处理后Crocosphaera watsonii细胞FL3(a)、FL2(b)、FSC(c)和SSC(d)荧光的变化 |
The authors have declared that no competing interests exist.
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