Light and temperature effects on photosynthetic activity of <scp>E</scp>ucheuma denticulatum and <scp>K</scp>appaphycus alvarezii (brown and green color morphotypes) from <scp>S</scp>ulawesi <scp>U</scp>tara, <scp>I</scp>ndonesia

Borlongan, Iris Ann; Gerung, Grevo S.; Nishihara, Gregory N.; Terada, Ryuta

doi:10.1111/pre.12155

Cited by 16 publications

(11 citation statements)

References 57 publications

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“…To the best of our knowledge, reports on the effect of rising temperature on multiple physiological and biochemical responses of K . alvarezii are yet to be available with most literature focused solely on the impact on photosynthesis [ 20 , 21 ] nutrient uptake [ 23 ] or production of halogenated compounds [ 16 ]. Hence, the present study aims to investigate the physiological (growth and photosynthesis) and biochemical (carrageenan yield and quality, pigments and production of reactive oxygen species) responses of K .…”

Section: Introductionmentioning

confidence: 99%

Impact of elevated temperature on the physiological and biochemical responses of Kappaphycus alvarezii (Rhodophyta)

et al. 2020

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The eucheumatoids Kappaphycus and Eucheuma are cultivated in tropical or subtropical regions for the production of carrageenan, a hydrocolloid widely used in the food and cosmetic industries. Kappaphycus alvarezii is a highly valued economic crop in the Coral Triangle, with the Philippines, Indonesia and Malaysia ranked among the largest producers. In the absence of measures to mitigate climate change, extreme events including heatwaves, typhoons, severe El Niño and La Niña, are expected to increase in frequency and magnitude. This inadvertently brings adverse effects to the seaweed cultivation industry, especially in the tropics. Temperatures are rapidly reaching the upper limit of biologically tolerable levels and an increase in reports of ice-ice and pest outbreaks is attributable to these shifts of environmental parameters. Nevertheless, few reports on the response of eucheumatoids to a changing environment, in particular global warming, are available. Understanding the responses and possible mechanisms for acclimation to warming is crucial for a sustainable seaweed cultivation industry. Here, the physiological and biochemical responses of K . alvarezii to acute warming indicated that the strain used in the current study is unlikely to survive sudden increases in temperature above 36°C. As temperature increased, the growth rates, photosynthetic performance, phycocolloid quality (carrageenan yield, gel strength and gel viscosity) and pigment content (chlorophyll- a , carotenoid and phycobiliproteins) were reduced while the production of reactive oxygen species increased indicating the occurrence of stress in the seaweeds. This study provides a basis for future work on long term acclimation to elevated temperature and mesocosm-based multivariate studies to identify heat-tolerant strains for sustainable cultivation.

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Section: Introductionmentioning

confidence: 99%

Impact of elevated temperature on the physiological and biochemical responses of Kappaphycus alvarezii (Rhodophyta)

et al. 2020

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“…The photosynthetic rates at eight different light intensities were curve-fitted using a non-linear least square regression comparing differences between measured and calculated values with Solver Module in Excel (Microsoft Corp., Redmond, USA) (Roleda et al 2006), following a model using an exponential equation (Webb et al 1974;Jassby & Platt 1976;Platt et al 1980;Henley 1993) as cited by Borlongan et al (2017) [P n = Pmax((1 − exp(−α/Pmax)(I)) − Rd], where, P n is the net photosynthesis, Pmax is the maximum photosynthesis, α is the initial slope of the curve, I is the incident irradiance and Rd is the dark respiration. The saturation and compensation irradiance were computed as Ik (=Pmax/α) and Ic [=Pmax(ln((Pmax)/(Rd − Pmax))/α], respectively.…”

Section: Discussionmentioning

confidence: 99%

“…; Henley ) as cited by Borlongan et al . () [ P n = Pmax ((1 − exp (− α / Pmax )( I )) − Rd ], where, P n is the net photosynthesis, Pmax is the maximum photosynthesis, α is the initial slope of the curve, I is the incident irradiance and Rd is the dark respiration. The saturation and compensation irradiance were computed as Ik ( =Pmax/α ) and Ic [= Pmax ( ln (( Pmax )/( Rd − Pmax ))/ α ], respectively.…”

Section: Methodsmentioning

confidence: 99%

Chloroplast position and photosynthetic characteristics in two monostromatic species,Monostroma angicavaandProtomonostroma undulatum(Ulvophyceae), having a shared ecological niche

Saco

Murakami

Sekida

et al. 2017

Phycological Research

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SUMMARYMonostroma angicava and Protomonostroma undulatum are monostromatic green benthic algae (Ulvophyceae), which grow together in the same intertidal habitat of Muroran, Hokkaido, Japan, during the spring season. Commonly, both species have a single chloroplast with one pyrenoid per cell. The parietal chloroplast is located on the periphery of the thallus in both species, although the location of the chloroplast differs in the two. In M. angicava, the chloroplast was observed to be arranged on one-side of the thallus surface, whereas, in P. undulatum, it was dispersed and randomly located on either side of the thallus or on the lateral face. The density of chlorophylls (Chls) assessed from the absorption spectra of the thallus and its solvent extract was higher in M. angicava, which appeared dark-green in color, than in the light-green colored P. undulatum. The maximum photosynthetic rate per thallus area (μmol O 2 m −2 s −1 ) was higher in M. angicava, whereas, per total chlorophyll content (μmol O 2 g Chl a + Chl b −1 s −1 ) was higher in P. undulatum. Both species showed similar efficiency of photosynthesis at light-limiting conditions. The efficiency of light absorption by photosystem II (PSII) in P. undulatum was higher than M. angicava, whereas the photoprotective response was higher in M. angicava. This indicates that more energy is utilized in M. angicava to protect its PSII due to the chloroplast position, which has more direct exposure to light and, therefore, lowers the efficiency of light absorption by PSII. The higher density of chlorophylls in M. angicava could explain higher photosynthesis per thallus area, whereas, higher efficiency of light absorption by PSII in P. undulatum could explain higher photosynthesis per total chlorophyll content. The differences in light absorption efficiency and quantum efficiency of PSII might be an important ecological strategy in these two species for their coexistence in the intertidal area.

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“…; Borlongan et al . ). The data in our study were not paired and therefore we applied the latter approach by using the following P‐I curve (Webb et al .…”

Section: Methodsmentioning

confidence: 97%

“…fitting the data to a non-linear P-I model and estimating P-I parameters and their differences at a time (e.g. Fujimoto et al 2014;Borlongan et al 2017). The data in our study were not paired and therefore we applied the latter approach by using the following P-I curve (Webb et al 1974;Jassby & Platt 1976;Platt et al 1980;Henley 1993) as the basal equation to fit P n :…”

Section: Photosynthesis and Respiration Ratesmentioning

confidence: 99%

Photosynthesis and growth of Ulva ohnoi and Ulva pertusa (Ulvophyceae) under high light and high temperature conditions, and implications for green tide in Japan

Nakamura

Kumagai

Tamaoki

et al. 2019

Phycological Research

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SUMMARY The macroalga Ulva ohnoi constitutes a considerable fraction of green tides in coastal areas of Japan, but little is known about the physiological characteristics of this species. To investigate the environmental factors that promote the formation of green tides, we tested the responses of U. ohnoi and another common Japanese species, Ulva pertusa, to various levels of irradiance at different water temperatures. Because the two species are morphologically similar, we identified them using the PCR‐restriction fragment length polymorphism method. Under laboratory conditions, we evaluated the photosynthetic, dark respiration, and relative growth rate at a range of water temperatures (5 to 35°C) and photosynthetically active radiation (0 to 1000 μmol photons m−2 s−1). The maximum gross photosynthetic rate of U. ohnoi was larger than that of U. pertusa. The dark respiration rates revealed no significant differences among the species and temperature conditions. At 500 μmol photons m−2 s−1, the relative growth rate of U. ohnoi was larger than that of U. pertusa in higher temperature and the difference was the largest at 20°C. The estimated compensation irradiance and estimated saturation irradiance of U. ohnoi and U. pertusa ranged from 0.709 to 5.510 and 40.530 to 58.674 μmol photons m−2 s−1, which were lower than those in other intertidal green macroalgae, from 6 to 11 and 50 to 82 μmol photons m−2 s−1, respectively. Thus, U. ohnoi which exists as free‐floating near the water surface and accumulating inside the green tide can survive extensively in the water column of the intertidal zone, furthermore, the species can maintain rapid growth in this situation. Therefore, as a result of this study, it is suggested that the ecological success of U. ohnoi in shallow waters such as the tidal flats, estuarine, and coasts of the inner bay in comparison with U. pertusa.

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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

Cited by 16 publications

References 57 publications

Impact of elevated temperature on the physiological and biochemical responses of Kappaphycus alvarezii (Rhodophyta)

Impact of elevated temperature on the physiological and biochemical responses of Kappaphycus alvarezii (Rhodophyta)

Chloroplast position and photosynthetic characteristics in two monostromatic species,Monostroma angicavaandProtomonostroma undulatum(Ulvophyceae), having a shared ecological niche

Photosynthesis and growth of Ulva ohnoi and Ulva pertusa (Ulvophyceae) under high light and high temperature conditions, and implications for green tide in Japan

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