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The effect of metapleural gland secretion on the growth of a mutualistic bacterium on the cuticle of leaf-cutting ants

机译:胸膜腺分泌物对切叶蚂蚁表皮上共生细菌生长的影响

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摘要

In Acromyrmex octospinosus leaf-cutting ants the metapleural glands produce an array of antibiotic compounds that serve as a general defence against unwanted microbes on the cuticle. Leaf-cutting ants also grow mutualistic Pseudonocardiaceae bacteria on their cuticle that produce antibiotics controlling a microfungal parasite of their fungus gardens. Interaction between this bacterium and gland secretion therefore seems unavoidable. We document the typical development of bacterial growth on the cuticle of young major workers, show that growth starts a few days after eclosion, and that the maximal cover is reached after 2-3 weeks and gradually declines when workers mature. Experimental closure of the metapleural glands had no effect on the initial exponential growth phase of the bacterium, but significantly reduced the cover during the decline phase. The age-dependent abundance of the bacterium and its partial dependence on metapleural gland secretion support the hypothesis that the abundance of this mutualist is actively regulated.
机译:在Acromyrmex octospinosus切叶蚂蚁中,胸膜腺产生一系列抗生素化合物,这些化合物可对表皮上的有害微生物起到一般防御作用。切叶蚁还会在它们的表皮上生长互助的假心动菌,这些细菌产生控制其真菌园中微真菌寄生虫的抗生素。因此,这种细菌与腺体分泌之间的相互作用似乎是不可避免的。我们记录了年轻主要工作人员表皮上细菌生长的典型发展,表明生长在隐蔽后的几天开始,并且最大覆盖量在2-3周后达到,并在工作人员成熟时逐渐下降。实验性关闭胸膜腺对细菌的初始指数生长期没有影响,但是在衰落阶段显着减少了覆盖。细菌的年龄依赖性丰度及其对肋膜腺分泌的部分依赖性支持了以下假设:该互惠者的丰度受到积极调节。

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