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首页> 外文期刊>Journal of Applied Phycology >Competition between toxic Microcystis aeruginosa and nontoxic Microcystis wesenbergii with Anabaena PCC7120
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Competition between toxic Microcystis aeruginosa and nontoxic Microcystis wesenbergii with Anabaena PCC7120

机译：铜绿微囊藻与无毒微囊藻与鱼腥藻PCC7120的竞争

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摘要

To elucidate the changes in the proportions of microcystin (MC)-producing Microcystis, non-MC-producing Microcystis and Anabaena strains during cyanobacteria blooms, we compared their fitness under different initial biomass ratios. Culture experiments were carried out with three cyanobacterial strains: single-celled toxic Microcystis aeruginosa PCC7806 (Ma7806), single-celled nontoxic Microcystis wesenbergii FACHB-929 (Mw929) and filamentous Anabaena PCC7120 (An7120). Growth curves expressed as biovolume, Ma7806 microcystin-LR (MC-LR) content (detected with HPLC and ELISA), and the culture medium dissolved total nitrogen and dissolved total phosphorous (DTP) were measured to monitor nutrient uptake. Results suggest that the dominant strain in competition experiments between Ma7806 and An7120 was mainly controlled by the initial biomass ratio of the two strains, but there was also evidence for allelopathic interactions, where MC-LR produced by Ma7806 played an important role in the competition process. However, Mw929 was always less competitive when co-cultured with An7120 regardless of initial biomass ratio. Culture medium DTP showed significant differences between competition experiments in all sets, suggesting that Mw929 could be more suited to low phosphorus environments than Ma7806 and An7120. Overall, the competitive ability of Ma7806 was stronger than Mw929 when co-cultured with An7120 in the case of excess nutrients and the results could well unravel the seasonal succession process of cyanobacteria blooms.
机译：为了阐明在蓝细菌开花期间产生微囊藻毒素（MC）的微囊藻，非产生MC微囊藻和Anabaena菌株比例的变化，我们比较了它们在不同初始生物量比下的适应性。用三种蓝细菌菌株进行培养实验：单细胞有毒铜绿微囊藻PCC7806（Ma7806），单细胞无毒韦氏微囊藻FACHB-929（Mw929）和丝状鱼腥藻PCC7120（An7120）。测量生长曲线，表示为生物量，Ma7806微囊藻毒素-LR（MC-LR）含量（用HPLC和ELISA检测）以及培养基中溶解的总氮和溶解的总磷（DTP），以监测养分吸收。结果表明，Ma7806和An7120之间竞争实验中的优势菌株主要受两种菌株的初始生物量比控制，但也存在化感相互作用的证据，其中Ma7806产生的MC-LR在竞争过程中起重要作用。 。但是，与初始生物量比率无关，与An7120共培养时Mw929的竞争力始终较弱。培养基DTP在所有组的竞争实验之间均显示出显着差异，这表明Mw929比Ma7806和An7120更适合于低磷环境。总体而言，在营养过剩的情况下，与An7120共培养时，Ma7806的竞争能力要强于Mw929，其结果可以很好地揭示蓝藻开花的季节性演替过程。

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