生物
蓝藻
共生
固氮
质体
固氮酶
光合作用
植物
叶绿体
进化生物学
细菌
基因
遗传学
作者
Anne Thompson,Rachel A. Foster,Andreas Krupke,Brandon J. Carter,Niculina Musat,Daniel Vaulot,Marcel M. M. Kuypers,Jonathan P. Zehr
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2012-09-21
卷期号:337 (6101): 1546-1550
被引量:426
标识
DOI:10.1126/science.1222700
摘要
Symbioses between nitrogen (N)(2)-fixing prokaryotes and photosynthetic eukaryotes are important for nitrogen acquisition in N-limited environments. Recently, a widely distributed planktonic uncultured nitrogen-fixing cyanobacterium (UCYN-A) was found to have unprecedented genome reduction, including the lack of oxygen-evolving photosystem II and the tricarboxylic acid cycle, which suggested partnership in a symbiosis. We showed that UCYN-A has a symbiotic association with a unicellular prymnesiophyte, closely related to calcifying taxa present in the fossil record. The partnership is mutualistic, because the prymnesiophyte receives fixed N in exchange for transferring fixed carbon to UCYN-A. This unusual partnership between a cyanobacterium and a unicellular alga is a model for symbiosis and is analogous to plastid and organismal evolution, and if calcifying, may have important implications for past and present oceanic N(2) fixation.
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