Aix Marseille Université, CEA, CNRS, BIAM, Luminy Génétique et Biophysique des Plantes, 13009 Marseille, France; Laboratoire de Chimie Bactérienne, IMM, CNRS, Aix-Marseille Université, 13402 Marseille, France.
Laboratoire de Chimie Bactérienne, IMM, CNRS, Aix-Marseille Université, 13402 Marseille, France.
Trends Plant Sci. 2024 Apr;29(4):406-412. doi: 10.1016/j.tplants.2023.11.005. Epub 2023 Nov 27.
Oxygenic photosynthesis evolved in cyanobacteria around 3.2 giga-annum (Ga) ago and was acquired by eukaryotes starting around 1.8 Ga ago by endosymbiosis. Photosymbiosis results either from integration of a photosynthetic bacteria by heterotrophic eukaryotes (primary photosymbiosis) or by successive integration of photosymbiotic eukaryotes by heterotrophic eukaryotes (secondary photosymbiosis). Primary endosymbiosis is thought to have been a rare event, whereas secondary and higher-order photosymbiosis evolved multiple times independently in different taxa. Despite its recurrent evolution, the molecular and cellular mechanisms underlying photosymbiosis are unknown. In this opinion, we discuss the primary events leading to the establishment of photosymbiosis, and we present recent research suggesting that, in some cases, domestication occurred instead of symbiosis, and how oxygen and host immunity can be involved in symbiont maintenance.
产氧光合作用大约在 32 亿年前在蓝藻中进化，并通过内共生被真核生物获得，大约在 18 亿年前。光合共生要么是由异养真核生物整合光合细菌（初级光合共生），要么是由异养真核生物连续整合光合真核生物（次级光合共生）。初级内共生被认为是一种罕见的事件，而次级和更高级的光合共生在不同的类群中独立进化了多次。尽管它反复进化，但光合共生的分子和细胞机制尚不清楚。在这篇观点文章中，我们讨论了导致光合共生建立的主要事件，并提出了最近的研究表明，在某些情况下，驯化发生了，而不是共生，以及氧气和宿主免疫如何参与共生体的维持。
