Enterobacteria-mediated nitrogen fixation in natural populations of the fruit fly Ceratitis capitata
Enterobacteria-mediated nitrogen fixation in natural populations of the fruit fly Ceratitis capitata
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DOI：
10.1111/j.1365-294x.2005.02615.x
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发表时间：
2005-08-01
影响因子：
4.9
通讯作者：
Jurkevitch, E
中科院分区：
文献类型：
--
作者：
Behar, A;Yuval, B;Jurkevitch, E
氮虽然在大气中含量丰富，但对多细胞生物来说却是一种矛盾的有限资源。在动物界，生物固氮仅在白蚁中得到证实。我们发现，所有个人的实地收集的地中海果蝇（Ceratitis capitata）海港大重氮肠细菌种群，在肠道中表达二氮还原酶。此外，固氮在离体肠道和活蝇中得到证实，并可能显着有助于苍蝇的氮摄入。在其他昆虫目中存在类似的细菌聚生体，这表明固氮作用发生在陆地昆虫的巨大水池中。在如此大的范围内，这种现象可能会对氮循环产生相当大的影响。
Nitrogen, although abundant in the atmosphere, is paradoxically a limited resource for multicellular organisms. In the Animalia, biological nitrogen fixation has solely been demonstrated in termites. We found that all individuals of field-collected Mediterranean fruit flies (Ceratitis capitata) harbour large diazotrophic enterobacterial populations that express dinitrogen reductase in the gut. Moreover, nitrogen fixation was demonstrated in isolated guts and in live flies and may significantly contribute to the fly's nitrogen intake. The presence of similar bacterial consortia in additional insect orders suggests that nitrogen fixation occurs in vast pools of terrestrial insects. On such a large scale, this phenomenon may have a considerable impact on the nitrogen cycle.