藻胆体去哪儿了？

Botany Department, University of British Columbia, Vancouver, BC V6N 3T7, Canada.

Biomolecules. 2019 Nov 19;9(11):748. doi: 10.3390/biom9110748.

The phycobilisome (PBS) is the major light-harvesting complex of photosynthesis in cyanobacteria, red algae, and glaucophyte algae. In spite of the fact that it is very well structured to absorb light and transfer it efficiently to photosynthetic reaction centers, it has been completely lost in the green algae and plants. It is difficult to see how selection alone could account for such a major loss. An alternative scenario takes into account the role of chance, enabled by (contingent on) the evolution of an alternative antenna system early in the diversification of the three lineages from the first photosynthetic eukaryote.

藻胆体（PBS）是蓝藻、红藻和蓝藻门藻类光合作用中的主要光捕获复合物。尽管它的结构非常适合吸收光并将其有效地传递到光合反应中心，但它在绿藻和植物中已经完全丢失。很难理解仅仅通过选择就能解释这样一个重大的损失。另一种情况考虑了偶然性的作用，这是由于在三个谱系从第一个光合真核生物分化的早期，替代天线系统的进化而成为可能。