Temperature induced bacterial virulence and bleaching disease in a chemically defended marine macroalga
Temperature induced bacterial virulence and bleaching disease in a chemically defended marine macroalga
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DOI：
10.1111/j.1462-2920.2010.02356.x
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发表时间：
2011-02-01
影响因子：
5.1
通讯作者：
Kjelleberg, Staffan
中科院分区：
文献类型：
--
作者：
Case, Rebecca J.;Longford, Sharon R.;Kjelleberg, Staffan
宿主-病原体相互作用在人类和陆生植物中已经得到了广泛的研究，但在海洋系统中的研究却少得多。在这里，我们表明，海洋macrophages，Delisea pulchra，利用化学防御-呋喃酮-抑制殖民化和感染的一种新的细菌病原体，Ruegeria sp. R11，R11的感染是温度依赖性的。Ruegeria sp. R11形成生物膜，侵入并漂白不含呋喃酮的D. pulchra thalli，在高温（24摄氏度），但不是低温（19摄氏度）。漂白现象在自然种群中普遍存在。在澳大利亚悉尼附近的pulchra，在南半球的夏季，海洋温度处于顶峰，海洋的化学防御能力降低。呋喃酮是D. pulchra作为一种化学防御，抑制细菌中的群体感应（QS），这可能在呋喃酮抑制R11感染无呋喃酮的菌体中起作用，因为R11产生QS信号。温度、藻类化学防御机制和细菌毒性之间的这种相互作用表明了环境变化对生态系统的复杂影响。
P>Host-pathogen interactions have been widely studied in humans and terrestrial plants, but are much less well explored in marine systems. Here we show that a marine macroalga, Delisea pulchra, utilizes a chemical defence - furanones - to inhibit colonization and infection by a novel bacterial pathogen, Ruegeria sp. R11, and that infection by R11 is temperature dependent. Ruegeria sp. R11 formed biofilms, invaded and bleached furanone-free, but not furanone-producing D. pulchra thalli, at high (24 degrees C) but not low (19 degrees C) temperatures. Bleaching is commonly observed in natural populations of D. pulchra near Sydney, Australia, during the austral summer when ocean temperatures are at their peak and the chemical defences of the alga are reduced. Furanones, produced by D. pulchra as a chemical defence, inhibit quorum sensing (QS) in bacteria, and this may play a role in furanone inhibition of R11 infection of furanone-free thalli as R11 produces QS signals. This interplay between temperature, an algal chemical defence mechanism and bacterial virulence demonstrates the complex impact environmental change can have on an ecosystem.