Photosynthesis in Marine Macroalgae

摘要: Marine macrophytes live in a highly variable environment respect to light, UV-radiation, temperature and also salinity. During evolution their metabolism has adapted these strongly changing conditions, especially the upper littoral zone. In lower subtidal, photosynthetic apparatus low light absorb maximally incident photons utilize absorbed energy with high efficiency. intertidal sublittoral zone is exposed strong stress when amount of higher than organism can use for its metabolism. This happens generally plants are irradiances, which above mean level irradiation occurring at growth sites (e.g., flecks or tide around noon). Under thermal dissipation increases flowing into photochemistry decreases also. Photoinhibition causes decrease quantum yield (dynamic inhibition) much fiuence rates after longer duration irradiation, capacity (chronic inhibition). The absorption cross- section chromatophores be diminished by chloroplast displacement shrinking, brown algae, rate photodamage light-absorbing apparatus. Irradiances, exceed protective capacities mechanisms, cause irreversible damage Normally, latter does not occur long natural sites.