The response of photosynthesis to temperature and irradiance in a green alga, Ryuguphycus kuaweuweu (Ulvales) reveals adaptation to a subtidal environment in the northern Ryukyu Islands

Terada, Ryuta; Shindo, Aoi; Moriyama, Hikari; Shimboku, Narumi; Nishihara, Gregory N.

doi:10.1016/j.algal.2023.103189

Algal Research

2023

DOI: 10.1016/j.algal.2023.103189

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The response of photosynthesis to temperature and irradiance in a green alga, Ryuguphycus kuaweuweu (Ulvales) reveals adaptation to a subtidal environment in the northern Ryukyu Islands

Ryuta Terada,

Aoi Shindo,

Hikari Moriyama

et al.

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Cited by 2 publications

References 35 publications

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Phenology and the response of photosynthesis to irradiance and temperature gradient in the herbal drug red alga, Chondria armata (Rhodomelaceae, Ceramiales) from Kagoshima, Japan

Terada,

Yoshizato,

Murakami

et al. 2024

J Appl Phycol

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Seasonal changes in the size of the herbal drug red alga Chondria armata (Rhodomelaceae, Ceramiales) were investigated in Kagoshima, Japan, which is near the northern distributional limit in the western Pacific. Additionally, its photosynthetic response to irradiance and temperature was examined using dissolved oxygen sensors and a pulse amplitude modulation (PAM)-chlorophyll fluorometer. This alga was observed in tidepools throughout the year; its height and weight were greatest in December and the lowest in April and May. The net photosynthesis of the photosynthesis–irradiance (P–E) curve determined at 28°C quickly saturated at 113 µmol photons m-2 s-1, with minimal inhibition even at 1000 µmol photons m-2 s-1. The gross photosynthesis of the photosynthesis–temperature (P–T) curved over 8 to 40°C, measured at 500 µmol photons m-2 s-1, peaked at 30.1°C and decreased rapidly below 20°C and above 36°C, respectively. Similarly, the effective quantum yield (ΔF/Fm') after a 3-day culture during 4–40°C at 50 µmol photons m-2 s-1 remained stable between 16°C and 32°C but decreased outside of this range. The combined effect of irradiance (200 [low] and 1000 [high] µmol photons m-2 s-1) and temperature (28, 22, and 16°C) revealed that ΔF/Fm' declined during exposure to high irradiance at all temperature treatments. However, it mostly recovered after a subsequent 12-hour period of dim-light acclimation at 28°C and 22°C. In contrast, those at 16°C could not recover, indicating the occurrence of low-temperature light stress. This alga appears to be well-adapted to the irradiance and temperature environment at the study site. However, the winter temperature appears to approach its threshold level, and the occurrence of strong light during the winter might adversely affect the abundance of this alga near its northern distributional limit.

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Phenology and the response of photosynthesis to irradiance and temperature gradient in the herbal drug red alga, Chondria armata (Rhodomelaceae, Ceramiales) from Kagoshima, Japan

Terada,

Yoshizato,

Murakami

et al. 2024

J Appl Phycol

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Optimizing cultivation and shipping environments for an edible green alga, Caulerpa chemnitzia var. laetevirens (Bryopsidales) from Japan: Effects of temperature, irradiance, desiccation and salinity on photochemical efficiency

Terada,

Matsuda,

Nishihara

2023

Phycological Research

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SUMMARYThe effects of four stressors, temperature, irradiance, desiccation and salinity, on the photochemical efficiency (ΔF/) of an edible green alga, Caulerpa chemnitzia var. laetevirens from Kagoshima, Japan, were determined for optimizing cultivation and shipping environments using a pulse amplitude modulation‐chlorophyll fluorometer. The ΔF/ remained stable at 24–34°C during the 3‐day temperature exposures ranging from 8 to 36°C; however, it dropped at higher and lower temperatures. During continuous exposure for 6 h to irradiance levels of 400 (low) and 1000 (high) μmol photons m−2 s−1 at 16, 24 and 32°C, the decrease in ΔF/ was pronounced at high irradiance. Moreover, ΔF/ also dropped at 16°C even under low irradiance, suggesting the occurrence of low temperature–light stress. Desiccation experiments under 50% humidity and up to 5 h of aerial exposure at 24°C and dim light (20 μmol photons m−2 s−1) indicated that ΔF/ was well tolerated within 1 h of desiccation; however, it dropped quickly as the desiccation period prolonged, suggesting that, if more than 20% of the interior water was lost, ΔF/ dropped progressively. However, during a similar experiment up to 14 days of aerial exposure under saturated humidity (99%) and dim light (12:12 h light/dark photocycle), as the interior water of the frond was maintained because of the saturated humidity, ΔF/ appeared to be well maintained for up to 5 days. Similar to desiccation, this alga exhibited stenohaline characteristics (30–40 psu) under the salinity gradient of 0–80 psu for up to 7 days of culture at 24°C and under dim light (12:12 h light/dark). In conclusion, this alga can be cultivated by modifying the techniques used for cultivating Japanese Caulerpa lentillifera and adjusting its environment accordingly. To ensure appropriate shipping conditions, it is essential to maintain saturated humidity in a plastic container at room temperature.

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The response of photosynthesis to temperature and irradiance in a green alga, Ryuguphycus kuaweuweu (Ulvales) reveals adaptation to a subtidal environment in the northern Ryukyu Islands

Cited by 2 publications

References 35 publications

Phenology and the response of photosynthesis to irradiance and temperature gradient in the herbal drug red alga, Chondria armata (Rhodomelaceae, Ceramiales) from Kagoshima, Japan

Phenology and the response of photosynthesis to irradiance and temperature gradient in the herbal drug red alga, Chondria armata (Rhodomelaceae, Ceramiales) from Kagoshima, Japan

Optimizing cultivation and shipping environments for an edible green alga, Caulerpa chemnitzia var. laetevirens (Bryopsidales) from Japan: Effects of temperature, irradiance, desiccation and salinity on photochemical efficiency

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