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    Current Biology封面:功成之后,昆虫重复利用共生菌

    摘要 : 2014年10月06日《Current Biology》封面显示的是:一个谷物象鼻虫,米象,它刚刚摆脱小麦籽粒。这种害虫在发展中国家可以摧毁高达40%的谷物库存量。

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    2014年10月06日《Current Biology》封面显示的是:一个谷物象鼻虫,米象,它刚刚摆脱小麦籽粒。这种害虫在发展中国家可以摧毁高达40%的谷物库存量。

    雌虫在谷物里面产卵,胚胎发育成幼虫,在变为成虫之前,幼虫从内部吃掉谷物,大约在胚胎沉积一个月后,从谷物新产生出成虫。

    象鼻虫—共生菌关联揭示了代谢和细胞功能之间的一种相互适应作用能最大限度地减少共生成本,并且,新出现的成虫特别容易受到伤害,在这个关键阶段能加速骨骼形成。

    封面内容2

    原文标题:Insects Recycle Endosymbionts when the Benefit Is Over

    原文摘要:Symbiotic associations are widespread in nature and represent a driving force in evolution. They are known to impact fitness, and thereby shape the host phenotype [ 1–4 ]. Insects subsisting on nutritionally poor substrates have evolved mutualistic relationships with intracellular symbiotic bacteria (endosymbionts) that supply them with metabolic components lacking in their diet [ 5–10 ]. In many species, endosymbionts are hosted within specialized host cells, called the bacteriocytes, and transmitted vertically across host generations [ 11 ]. How hosts balance the costs and benefits of having endosymbionts, and whether and how they adjust symbiont load to their physiological needs, remains largely unexplored. By investigating the cereal weevil Sitophilus association with the Sodalis pierantonius endosymbiont [ 8, 12 ], we discover that endosymbiont populations intensively multiply in young adults, before being rapidly eliminated within few days. We show that young adults strongly depend on endosymbionts and that endosymbiont proliferation after metamorphosis matches a drastic host physiological need for the tyrosine (Tyr) and phenylalanine (Phe) amino acids to rapidly build their protective exoskeleton. Tyr and Phe are precursors of the dihydroxyphenylalanine (DOPA) molecule that is an essential component for the cuticle synthesis. once the cuticle is achieved, DOPA reaches high amounts in insects, which triggers endosymbiont elimination. This elimination relies on apoptosis and autophagy activation, allowing digestion and recycling of the endosymbiont material. Thus, the weevil-endosymbiont association reveals an adaptive interplay between metabolic and cellular functions that minimizes the cost of symbiosis and speeds up the exoskeleton formation during a critical phase when emerging adults are especially vulnerable.(DOI:http://dx.doi.org/10.1016/j.cub.2014.07.065)

    来源: Current Biology 浏览次数:45

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