A comparative study on the temperature and light intensity suitable for gametophytic and tetrasporophytic growth of Chinese Asparagopsis taxiformis
Research on the artificial cultivation of Asparagopsis has received increasing attention owing to its po-tential environmental benefits as an effective methane-release inhibitor for ruminants.Here,the light response curves of the gametophytes and tetrasporophytes of Asparagopsis taxiformis were determined first at the onset of light saturations(Ik)of 56 and 88 μmol/(m·s),respectively.Then,different light conditions were set up to study the effects of irradiation on the photosynthesis and respiration rates in the algae.The results showed that the tetraspo-rophytes exhibited a higher photosynthetic activity in comparison to gametophytes.The light compensation point,established using a liquid-phase oxygen electrode,was consistently identified at 10 μmol/(m·s)in both the game-tophytes and tetrasporophytes.Notably,the light intensity saturation point for the tetrasporophytes was 250-270 μmol/(m·s),substantially surpassing that of the gametophytes at 100 μmol/(m·s).However,the soluble total proteins,phycoerythrin,and chlorophyll-a contents did not differ significantly between the two generations.Within 15℃-31℃,the photosynthetic systems of both the tetrasporophytes and gametophytes did not exhibit any stress-related damage,while the effective quantum yield of the tetrasporophytes was slightly affected at>29℃during the fifth day of cultivation.These results also revealed no marked variations in the soluble total protein,phycoerythrin,and chlorophyll-a levels between the two algal morphologies.The filamentous tetrasporophyte ex-hibited remarkably higher photosynthetic efficiency than the gametophyte due to its larger surface area.Therefore,the tetrasporophyte of A.taxiformis is a prime candidate for future reactor-based large-scale commercial cultivation compared to the gametophyte due to its wide adaptability to varying light intensities and higher photosynthetic ac-tivity.
国家科技期刊平台
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