Effect of PAR and temperature on the photosynthesis of the Japanese alga, <i>Ecklonia radicosa</i> (Laminariales), based on field and laboratory measurements

Terada, Ryuta; Shikada, Soukuh; Watanabe, Yasumasa; Nakazaki, Yoshiki; Matsumoto, Kazuya; Kozono, Junpei; Saino, Naoko; Nishihara, Gregory N.

doi:10.2216/15-97.1

Cited by 28 publications

(34 citation statements)

References 30 publications

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“…Methods for photosynthesis – irradiance ( P–E ) experiment followed those of previous studies (Fujimoto et al ; Vo et al ; Terada et al ,). Seaweed samples were subjected to nine irradiance levels (0, 30, 60, 100, 150, 200, 250, 500 and 1000 μmol photons m − 2 s −1 ) with five replicates, at a fixed temperature of 26°C.…”

Section: Methodsmentioning

confidence: 99%

“…F v /F m of the alga were measured from 8 to 38°C in 2°C increments, with a Maxi Imaging‐PAM (Heinz Walz GmbH, Effeltrich, Germany), as described in previous studies (Fujimoto et al ; Vo et al ; Terada et al ,). Initially, 6–8 cm‐long sections of the thalli of each species were prepared and dark‐acclimated overnight in the incubator at 26°C.…”

Section: Methodsmentioning

confidence: 99%

“…Subsequently, samples were once more dark‐acclimated for 12 h at 26°C; and their F v /F m ’s were measured to confirm the possibility of recovery. Laboratory measurements of quantum yields ( F v /F m , Φ PSII ) were likewise carried out with a Maxi Imaging‐PAM (Kokubu et al ; Terada et al ,).…”

Section: Methodsmentioning

confidence: 99%

“…The constant 297.15 is 24°C scaled in absolute temperature. Simultaneous model fittings and determination of model parameters for Equations 2 and 3 were carried out using a Bayesian approach, where the prior distributions for the parameters were determined by averaging the mean and variances of estimates from previous studies (Fujimoto et al ,, ; Kokubu et al ; Vo et al ; Terada et al ,,).

R_{d} = R_{24} italicexp ((),, - \frac{E_{a}}{R} ((),, \frac{1}{K - 297.15}))

…”

Section: Methodsmentioning

confidence: 99%

“…It is of our great interest to evaluate and clarify site‐ and species‐specific response to environmental conditions. Our recent studies using a pulse amplitude modulated (PAM)‐ chlorophyll fluorometer, coupled with dissolved oxygen measurements, revealed the photosynthetic response to temperature and PAR of several freshwater and marine macroalgae (Fujimoto et al ,, ; Kokubu et al ; Vo et al ; Terada et al ,,). For instance, K. alvarezii from Vietnam yielded the highest maximum quantum yield (maximum photochemical efficiency of photosystem II, F v /F m ; Cosgrove & Borowitzka ) of 0.51 at 22.2°C (Terada et al ).…”

Section: Introductionmentioning

confidence: 99%

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Light and temperature effects on photosynthetic activity of Eucheuma denticulatum and Kappaphycus alvarezii (brown and green color morphotypes) from Sulawesi Utara, Indonesia

Borlongan

Gerung

Nishihara

et al. 2016

Phycological Research

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SUMMARY Knowledge concerning the effects of several abiotic factors on the physiology of carrageenophytes is essential both in ecological and economic standpoints, to ensure their sufficient supply for the sustainability of seaweed‐based industries. This paper presents the photosynthetic characteristics of farmed carrageenophytes, E ucheuma denticulatum and K appaphycus alvarezii [brown (BRN) and green (GRN) color morphotypes] from Sulawesi Utara (Sulawesi Island), Indonesia, as determined by examining their photosynthetic response across different temperatures and irradiances using dissolved oxygen measurements and pulse‐amplitude modulated fluorometer. Net photosynthesis–irradiance ( P – E ) curves at 26°C revealed that net photosynthetic rates of the three seaweeds gradually increased until the estimated saturation irradiances ( E k ) of 58 μmol photons m− 2 s−1 (49–68 μmol photons m− 2 s−1, 95% Bayesian prediction intervals; BPI) for E . denticulatum, and 158 and 143 μmol photons m− 2 s−1 (134–185 and 99–203 μmol photons m− 2 s−1, 95% BPI) for BRN and GRN K . alvarezii, respectively; and that no photoinhibition was observed at the highest irradiance of 1000 μmol photons m− 2 s−1. All seaweed samples exhibited photosynthetic tolerance to high PAR as shown by their recovery in maximum quantum yields (Fv / Fm ) following chronic exposures; as well as tolerance over a broad range of temperature, which is from 19 to 33°C for E . denticulatum, 20–29°C for BRN K . alvarezii, and 17–32°C for GRN K . alvarezii. Temperature responses of these carrageenophytes indicated that they were well‐adapted to the annual seawater temperatures in the cultivation site; however, they are also likely close to threshold levels for thermal inhibition, given the decline in Fv / Fm above 30°C.

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Section: Methodsmentioning

confidence: 99%