There are two ecotypes of Prochlorococcus, one is adapted to strong light, and the other is adapted to weak light. The genome of Prochlorococcus glabratus is 1657990 base pairs and 17 16 genes, which is the smallest genome among known oxygen-producing photosynthetic organisms.

The genomes of weak light-type Prochlorococcus are larger, but the similarity of 16S ribosomal RNA between them is 97%. According to the current bacterial classification method of human beings, they are still the same species. Photosynthesis usually refers to the process that green plants (including algae) absorb light energy, synthesize carbon dioxide and water into high-energy organic matter, and release oxygen at the same time.

It mainly includes two stages: light reaction and dark reaction, involving light absorption, electron transfer, photosynthetic phosphorylation, carbon assimilation and other important reaction steps, which is of great significance to realize natural energy conversion and maintain the balance of carbon and oxygen in the atmosphere.

It took four years from the discovery of a large number of Prorocentrum in the ocean to the naming of Prorocentrum. 1979, Johnson and Sibos observed the marine organism protococcus with electron microscope for the first time.

Evolutionary adaptation mechanism of protococcus in primary producers.

Under the condition of low recombination level, natural selection will fix the whole genome with dominant genes and eliminate the whole genome without dominant genes, thus reducing the neutral genetic polymorphism and effective population size of Chlorella protozoa and strengthening its genetic drift.

This study provides an innovative viewpoint and theory for the common gene reduction phenomenon of dominant groups in oligotrophic environment, and supplements the traditional viewpoint of "adapting to oligotrophic environment"