The life of laver includes two distinct stages: the larger thallus (gametophyte generation) and the smaller filamentous body (sporophyte generation). The thallus is sexually propagated, and the vegetative cells are transformed into female and male cells respectively. After fertilization, female cells divide many times to form fruit spores, which are released from algae after maturity, attach to calcareous shells and other substrates with the flow of seawater, germinate and grow in the shells. Grow into filaments. Filaments grow to a certain extent to produce cyst branches of conchospores, and then divide to form conchospores. After release, the shell spores attach to rocks or artificial stakes or net curtains and germinate directly into phyllodes. In addition, some kinds of bacteria can also reproduce asexually, from vegetative cells to monospores, and grow directly into bacteria after spreading and attaching. Monospore is also one of the important seed sources in aquaculture production.
Porphyra thallus mostly grows in intertidal zone, and likes the sea area with strong wind and waves, gentle tidal current and rich nutrition. Strong anti-drying ability; The suitable light intensity is 5000 ~ 6000 lux, which has the characteristics of high light saturation point and low light compensation point and belongs to high-yield crops. The adaptability to low temperature varies with the water content of algae. When it is quickly dried to 20% water content, it can still recover its vitality after being refrigerated at a low temperature of about -20℃ for several months to 1 year. It has a wide range of application to the specific gravity of seawater, but 1.020 ~ 1.025 is suitable. Filaments have poor dry resistance and low requirements for light, and are naturally distributed below the low tide line. Under the condition that the temperature begins to drop and the sea water flows, conchospores are often released in large quantities at 9 ~ 1 1 every morning, showing obvious diurnal periodicity.