PHOTOSYNTHETIC ACTION SPECTRA AND LIGHT‐HARVESTING IN <i>GRIFFITHSIA MONILIS</i> (RHODOPHYTA)

Larkum, A. W. D.; Weyrauch, Solveig

doi:10.1111/j.1751-1097.1977.tb07425.x

Cited by 24 publications

(11 citation statements)

References 35 publications

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“…In the red alga Griffithsia monilis Harvey the phycobilins are the major light-harvesting pigments under low light intensities, whereas with increasing photon flux density, carotenoids and chlorophyll a contribute proportionally more {Larkum & Weyrauch, 1977). B. radicans is very likely to respond in a similar manner as G. monilis.…”

Section: Discussionmentioning

confidence: 89%

The effect of salinity on growth, photosynthesis and respiration in the estuarine red algaBostrychia radicans mont

Karsten

Kirst

1989

Helgolander Meeresunters

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The estuarine red alga, Bostrychia radicans, was subjected to osmotic stresses ranging from hypo-osmotic (9.9%o) to hyperosmotic conditions (37.4 %o). The growth rate decreased with increasing salinities and showed a maximum in a mesohaline medium, while the photosynthetic rate and the chlorophyll a content increased under hyper-osmotic conditions. The rate of respiration remained constant over the salinity range tested. B. radicans revealed typical characteristics of "shade plants" having a low light compensation point at 3-4 ~tE m -2 s -1 correlated with a low photon flux density of 70-100 ~E m-2s -1 for saturation of photosynthesis. These physiological properties may explain the success of B. radicans in estuarine habitats,

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Section: Discussionmentioning

confidence: 89%

The effect of salinity on growth, photosynthesis and respiration in the estuarine red algaBostrychia radicans mont

Karsten

Kirst

1989

Helgolander Meeresunters

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“…Hence, a possible importance of light quality for red algal growth at very low levels was missed. The fading importance of phycobilins at increasing light intensity had been stressed by Larkum & Weyrauch (1977). These authors had found from photosynthetic action spectra in the red alga Griffithsia monilis that at low intensity the phycobilins are the major light-harvesting pigments, while at increasing light intensity chlorophyll and carotenoids contribute proportionately more to the spectrum since the phycobilin activity becomes light-saturated.…”

Section: Discussionmentioning

confidence: 99%

Minimum spectral light requirements and maximum light levels for long-term germling growth of several red algae from different water depths and a green alga

Leukart¹,

Lüning²

1994

European Journal of Phycology

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Spores and germlings of six red algal species were cultivated for 15 weeks in coloured light fields at low intensities. The photon fluence rates at which growth exceeded growth in dark-kept controls were, in green light, 0-1 #mol m-2s -1 in Audouinella daviesii, 0.5 #mol m-2s -1 in Halarachnion ligalatum, Pterothamnion plumula, Chondrus crispus and Plumaria elegans, and I'0/~mol m-2s -~ in Ceramium rubrum. In blue or red light, at least 1-0 #mol m-2s -1 was required for germling growth in these species, except for P. elegans which required 0"5 #mol m-Zs -I in blue light. The advantage of green light for growth was particularly evident in A. daviesii which formed no more than two cells in darkness and in photon fluence rates up to 1 #tool m-Zs -~ of blue or red, but one further cell after 15 weeks at 0"1 #mol m-2s -1 in green. Germling growth of the green alga Ulva pseudocurvata required at least 3/zmol m-2s -1 in green, but only 1"0/zmol m-2s -1 in blue or red light. White fluorescent light levels permitting growth in red algae were higher than those in green light and equal to minimum requirements in blue or red light in the majority of species investigated. Settled spores of H. ligulatum and the green alga Chaetomorpha melagonium survived for at least 1 year in darkness, whereas spores of C. crispus survived only 39 weeks and those of 11 other red algae and U. pseudocurvata survived 26 weeks or less. Light saturation and light inhibition of growth occurred at higher photon fluence rates in the lower eulittoral species Ceramium rubrum, C. crispus and U. pseudocurvata (saturation, 200-300 #tool m-2s-1; inhibition, 300-500/zmol m-2s -1) than in the strictly sublittoral species H ligulatum and P, plumula (saturation, 10-20 #mol m-2s-~; inhibition, 50-100 #mol m-2s-1).

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“…These results suggest that the available light over the vertical profile studied here in spring did not cause changes in chl a. Accessory pigments rather than chl a might be more strongly involved in the capacity of the algae to absorb light in deeper waters. On the other hand, the accumulation of chl a in plants growing in upper sublittoral zones might be associated with its higher absorption efficiency at higher irradiances compared to phycobilins, whose activity may become more rapidly light-saturated (Larkum & Weyrauch 1977).…”

Section: Changes In Chl a C And N Contentsmentioning

confidence: 99%

Photosynthetic light requirements, metabolic carbon balance and zonation of sublittoral macroalgae from King George Island (Antarctica)

Gómez¹,

Weykam²,

Klöser³

et al. 1997

Mar. Ecol. Prog. Ser.

104

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Photosynthesis, dark respiration, chlorophyll a contents and daily metabolic C balance were determined in 5 species of brown and red algae from Potter Cove (King George Island) during the Antarctic spring. In sitii irradiance data were used to d e t e r m~n e the light requirements of plants collected at 10, 20 and 30 m depth. Average daily maximum quantum irradiances measured in springsummer reached up to 23 pmol photons m-2 s-' a t 30 m depth indicating that macroalgae can effectively be exposed to non-limiting quantum irradiances for photosynthesis. Net photosynthetic rates (P,,,,,) were high in the brown alga Desmarestia anceps and the red algae Palmaria decipiens with values close to 33 and 36 pmol O2 g-l FW h-', respectively, at 20 m depth. With the exception of the brown alga Himantothallus grandifolius, all the species showed lower P,,,,, in plants collected at 30 m than at 10 and 20 m depth. The photosynthetic efficiency (a) varied strongly among species, but no clear depthdependent relations were found. Saturation (&) and compensation (L) points for photosynthesis were, in general, lower in plants growing at deep locations. In plants from 10 and 20 m, photosynthesis was saturated at significantly lower irradiances than in situ quantum irradiances. Values of I, varied between 58 pm01 photons m-' S ' in D. anceps and 15 pm01 photons m-2 S-' in the red alga Gigartina skottsbergii, while I, ranged between 1 and 10 pmol photons m-2 S-' in most of the species. D. anceps exceptionally had I, values close to 26 pm01 photons m-2 S-' in plants from 10 m depth. Overall, photosynthetic performance in these species was comparable to rates measured in macroalgae from upper littoral zones and did not provide evidence for metabolic acclimation with depth. Apparently, the daily periods for which plants are exposed to saturation and compensation irradiances (H,,, and H,,,,,) and, consequently, the metabolic C balance account for the acclimation of macroalgae to d e e p sublittoral zones. At 10 m, H,,, for many species was between 12 and 14 h, while at 30 m these periods decreased to 7 h in D. anceps or 9 h in the red alga KaUymenia antarctica. The H,,,,,, periods were longer, in the case of the red algae up to 16 h. The daily carbon balance decreased with depth. At 30 m, algae exhibited C gains lower than 1 mg C g-l FW d-' and in D. anceps, due to its high respiration rates, carbon balance was negative at saturation and compensation irradiances. In general, greater C gains relative to losses were found in plants growing at 20 m depth. Although data on P,,.,,, a. I, and I, indicate that Antarctic macroalgae are metabolically able to inhabit greater depths during spring-summer, the shortening oI the daylengths for which algae are exposed to saturating or compensating irradiances Impose a maximum depth limit at depths around 30 m.

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PHOTOSYNTHETIC ACTION SPECTRA AND LIGHT‐HARVESTING IN GRIFFITHSIA MONILIS (RHODOPHYTA)

Cited by 24 publications

References 35 publications

The effect of salinity on growth, photosynthesis and respiration in the estuarine red algaBostrychia radicans mont

The effect of salinity on growth, photosynthesis and respiration in the estuarine red algaBostrychia radicans mont

Minimum spectral light requirements and maximum light levels for long-term germling growth of several red algae from different water depths and a green alga

Photosynthetic light requirements, metabolic carbon balance and zonation of sublittoral macroalgae from King George Island (Antarctica)

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