Do macrophytes support harmful cyanobacteria? Interactions with a green alga reverse the inhibiting effects of macrophyte allelochemicals on Microcystis aeruginosa
Do macrophytes support harmful cyanobacteria? Interactions with a green alga reverse the inhibiting effects of macrophyte allelochemicals on Microcystis aeruginosa
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DOI：
10.1016/j.hal.2012.06.002
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发表时间：
2012-09-01
期刊：
影响因子：
6.6
通讯作者：
Hilt, Sabine
中科院分区：
文献类型：
--
作者：
Chang, Xuexiu;Eigemann, Falk;Hilt, Sabine
植物释放的化感物质越来越被认为是控制湖泊蓝藻水华的潜在自然措施。我们测试了常见的铜绿微囊藻，已知对化感物质敏感，在与不太敏感的绿藻相互作用时是否仍然受到抑制。研究了多酚类化感物质对3种不同接种物组成的常见绿藻--华山绿藻和铜绿藻的单一和混合培养的影响。多酚类物质以单宁酸的形式添加或由大型植物(Myriophyllum verticillatum L.)释放。在透析袋共存实验中。与绿藻的相互作用将化感物质对蓝藻的抑制作用转化为促进作用，从而提高了蓝藻的生长速度。因此，化感物质处理3天后，铜绿假单胞菌与绿藻之间的比例明显高于对照。当铜绿假单胞菌和绿藻的初始生长速度相似时，化感作用下蓝藻的丰度增加。因此，在调查大型植物化感作用的生态相关性及其抑制蓝藻水华的潜力时，需要考虑浮游植物物种之间的相互作用。(C)2012爱思唯尔B.V.保留所有权利。
Plant-released allelopathic substances are increasingly suggested as potential natural measure to control cyanobacteria blooms in lakes. We tested whether the common cyanobacterium Microcystis aeruginosa, known to be sensitive to allelochemicals, remains suppressed when interacting with a less sensitive green alga. We investigated the effects of polyphenolic allelochemicals on single and mixed cultures of the common green alga Desmodesmus armatus and M. aeruginosa with three different inoculum compositions. Polyphenols were added as tannic acid or released by a macrophyte (Myriophyllum verticillatum L.) in coexistence experiments with dialysis bags. Interaction with the green alga turned the inhibiting effect of allelochemicals on the cyanobacterium into an enhancement resulting in increased growth rates. The ratio between M. aeruginosa and the green alga consequently became significantly higher in treatments with allelochemicals as compared to controls after three days. When initial growth rates of M. aeruginosa and the green alga were similar, this resulted in an increasing abundance of the cyanobacterium under allelochemical presence. Interactions between phytoplankton species thus need to be taken into account when investigating the ecological relevance of macrophyte allelopathy and its potential to suppress cyanobacteria blooms. (c) 2012 Elsevier B.V. All rights reserved.