Effects of temperature, light level, and photoperiod on the physiology of Porphyra umbilicalis Kützing from the Northwest Atlantic, a candidate for aquaculture

Green, Lindsay A.; Neefus, Christopher D.

doi:10.1007/s10811-015-0702-6

Cited by 22 publications

(15 citation statements)

References 37 publications

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“…In the present study, at LC, extended photoperiods had a positive effect on the relative growth rate of adult U. linza, similar to previous studies on Laminaria sacharina, Porphyra umbilicalis and Ulva prolifera (Fortes & Lüning, 1980; Green & Neefus, 2016; Li et al, 2018). Carbon isotope fractionation experiments suggested that extended photoperiods could enhance growth by influencing inorganic carbon capture and fixation rate in algae (Rost et al, 2003).…”

Section: Discussionsupporting

confidence: 92%

Future CO₂-induced seawater acidification mediates the physiological performance of a green alga Ulva linza in different photoperiods

Yue

Gao

et al. 2019

PeerJ

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Photoperiods have an important impact on macroalgae living in the intertidal zone. Ocean acidification also influences the physiology of macroalgae. However, little is known about the interaction between ocean acidification and photoperiod on macroalgae. In this study, a green alga Ulva linza was cultured under three different photoperiods (L: D = 8:16, 12:12, 16:8) and two different CO2 levels (LC, 400 ppm; HC, 1,000 ppm) to investigate their responses. The results showed that relative growth rate of U. linza increased with extended light periods under LC but decreased at HC when exposed to the longest light period of 16 h compared to 12 h. Higher CO2 levels enhanced the relative growth rate at a L: D of 8:16, had no effect at 12:12 but reduced RGR at 16:8. At LC, the L: D of 16:8 significantly stimulated maximum quantum yield (Yield). Higher CO2 levels enhanced Yield at L: D of 12:12 and 8:16, had negative effect at 16:8. Non-photochemical quenching (NPQ) increased with increasing light period. High CO2 levels did not affect respiration rate during shorter light periods but enhanced it at a light period of 16 h. Longer light periods had negative effects on Chl a and Chl b content, and high CO2 level also inhibited the synthesis of these pigments. Our data demonstrate the interactive effects of CO2 and photoperiod on the physiological characteristics of the green tide macroalga Ulva linza and indicate that future ocean acidification may hinder the stimulatory effect of long light periods on growth of Ulva species.

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Section: Discussionsupporting

confidence: 92%

Future CO₂-induced seawater acidification mediates the physiological performance of a green alga Ulva linza in different photoperiods

Yue

Gao

et al. 2019

PeerJ

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show abstract

“…In the present study, at LC, extended photoperiods had a positive effect on the relative growth rate of adult U. linza, similar to previous studies on Laminaria sacharina, Porphyra umbilicalis and Ulva prolifera (Fortes & Lüning,1980;Green & Neefus, 2016;Li et al, 2018). Carbon isotope fractionation experiments suggested that extended photoperiods could enhance growth by influencing inorganic carbon capture and fixation rate in algae (Rost et al, 2003).…”

Section: Discussionsupporting

confidence: 90%

“…This hypothesis is supported by the present study where extended photoperiods increased the maximum quantum yield in PS II. On the other hand, the highest growth rates of Compsopogon coeruleus were obtained in shorter light periods (L: D = 8:16) (Zucchi & Necchi, 2001), the highest growth rates of Porphyra umbilicalis was found under neutral (L: D = 12:12) and longer (L: D = 16:8) light periods using 110 μmol photons m -2 s -1 (Green & Neefus, 2016), and the relative growth rate of Chlorella vulgaris cultured at L: D = 20:4 was lower than the RGR of alga cultured at L: D = 16:8 (Kendirlioglu et al, 2015). Therefore, the effects of photoperiod on algae appear to be species-specific.…”

Section: Discussionmentioning

confidence: 92%

Peer Review #1 of "Future CO2-induced seawater acidification mediates the physiological performance of a green alga Ulva linza in different photoperiods (v0.1)"

Raven¹

2019

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Photoperiods have an important impact on macroalgae living in the intertidal zone. Ocean acidification also influences the physiology of macroalgae. However, little is known about the interaction between ocean acidification and photoperiod on macroalgae. In this study, a green alga Ulva linza was cultured under three different photoperiods (L: D = 8:16, 12:12, 16:8) and two different CO 2 levels (LC, 400 ppm; HC, 1000 ppm) to investigate their responses. The results showed that relative growth rate of U. linza increased with extended light periods under LC but decreased at HC when exposed to the longest light period of 16h compared to 12h. Higher CO 2 levels enhanced the relative growth rate at a L: D of 8:16, had no effect at 12:12 but reduced RGR at 16:8. At LC, the L: D of 16:8 significantly stimulated maximum quantum yield (Yield). Higher CO 2 levels enhanced Yield at L: D of 12:12 and 8:16, had negative effect at 16:8. Non-photochemical quenching (NPQ) increased with increasing light period. High CO 2 levels did not affect respiration rate during shorter light periods but enhanced it at a light period of 16h. Longer light periods had negative effects on Chl a and Chl b content, and high CO 2 level also inhibited the synthesis of these pigments. Our data demonstrate the interactive effects of CO 2

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“…The decreased chlorophyll content in thalli may have decreased photosynthetic electron transport efficiency during submersion. It is also important to investigate the synergistic effects of environmental factors when determining the conditions for optimum photosynthetic efficiency of PS(II) in seaweeds (Green and Neefus, 2016).…”

Section: Discussionmentioning

confidence: 99%

Chlorophyll Fluorescence Characteristics Responses of Two Strains of Porphyra haitanensis to Emersion and Submersion

Quan¹

2017

IJAB

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The chlorophyll fluorescence characteristics of two Porphyry haitanensis strains were examined under different lengths of emersion and submersion. A 6 h emersion treatment had no significant effect on the photosystem II relative electron transport rate (rETR(II)) of the two strains. The rETR(II) values reached their maxima under an activation light intensity of 209 μmol·m -2 ·s -1 at 0 h and 6 h after emersion. The trends in the semi-saturation light intensity (Ik) values of the two strains resembled that of the maximum relative electron transfer rate (rETRmax), which was highest at 0 h and gradually decreased with emersion time. There were no significant differences in rETRmax and Ik between the two strains, indicating that the tolerance of the two strains to water stress was equivalent. In the short submersion times of 0 h and 16 h, rETR(II) reached its maximum value when the activation light intensity was 209 μmol·m -2 ·s -1 . There was no significant decrease in rETR(II) after 0 h and 16 h of submersion of the Dongtou local strain, but in the Eastern Zhejiang No. 1 strain, this value was significantly (P<0.05) reduced. This indicated that the Dongtou local strain was physiologically more active in the early period of submergence. As submersion time increased, the rETR(II) values of both strains gradually decreased. The highest Ik value of the two strains of P. haitanensis was observed after 16 h of submersion, at which point the initial slope value was also at its minimum. The change in the fast light curve fluorescence of the two strains was basically consistent across the submersion times. Selecting strains that are tolerant to submerged conditions and creating appropriate short-term emersed environments are important for optimal growth and high yields in P. haitanensis.

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Effects of temperature, light level, and photoperiod on the physiology of Porphyra umbilicalis Kützing from the Northwest Atlantic, a candidate for aquaculture

Cited by 22 publications

References 37 publications

Future CO₂-induced seawater acidification mediates the physiological performance of a green alga Ulva linza in different photoperiods

Future CO₂-induced seawater acidification mediates the physiological performance of a green alga Ulva linza in different photoperiods

Peer Review #1 of "Future CO2-induced seawater acidification mediates the physiological performance of a green alga Ulva linza in different photoperiods (v0.1)"

Chlorophyll Fluorescence Characteristics Responses of Two Strains of Porphyra haitanensis to Emersion and Submersion

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