Light-stimulated respiration in the green algaDunaliella tertiolecta: Involvement of the ultraviolet/blue-light photoreceptor(s) and phytochrome?

Ruyters, Günter

doi:10.1007/bf00959530

Cited by 21 publications

(9 citation statements)

References 12 publications

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“…Consequently, cell protein may be relatively greater under blue light conditions (Kowallik 1970, 1982, Ruyters et al 1984. Both red as well as blue light stimulation of respiration was recently reported for D. tertiolecta , Ruyters 1988. The results of this study are consistent with blue/red light enhancement of respiration.…”

Section: Discussionsupporting

confidence: 81%

Influence of irradiance and spectral quality on the carbon metabolism of phytoplankton I. Photosynthesis, chemical composition and growth

Rivkin¹

1989

Mar. Ecol. Prog. Ser.

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Within the euphotic zone of oceans and lakes, planktonic algae are exposed to concurrent changes in irradiance and spectral quality Most models of photoadaptations, however, consider only the effects of machance. Using a factorial expenmental design, this study evaluated the influence of irradiance and spectral quality on the chemical composition, and rates of carbon uptake, polymer synthesis and cell division of 2 species of marlne algae. Both the irradiance and spectral quality of light significantly @ S 0.05) influenced the chemical composition and the patterns and rates of carbon uptake and polymer synthesis. Cell division rates were not affected by light quality. Responses of the algae were complex and taxon-specific; however, there were several consistent patterns for all spectral qualities, chlorophyll a, proteins and polysaccharides and the proportion of photosynthate incorporated into proteins were lower at high than low irradiances. At all irradiances, chlorophyll a was greater in white and blue than red light. Rates of protein synthesis, carbon uptake and respiration were greater in blue and red than white hght of equal energy. Since there were distinct effects of irradiance and spectral quality on the metabolism and carbon uptake of marine phytoplankton, simulated in situ incubations which adjust irradiance but not spectral quality to in situ levels may not accurately estimate in situ rates of carbon uptake and protein metabolism. These experiments clearly show the importance of considering spectral quality in models of photoadaptation and primary production.

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Section: Discussionsupporting

confidence: 81%

Influence of irradiance and spectral quality on the carbon metabolism of phytoplankton I. Photosynthesis, chemical composition and growth

Rivkin¹

1989

Mar. Ecol. Prog. Ser.

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“…3). This agrees with reports of blue-light activation of respiration (Andersag & Pirson, 1976;Kowallik & Schatzle, 1980;Kowallik, 1982;Ruyters, 1988). It also opens up an interesting field of research since G. doyphora incubated with glycerol provides a system for studying the effects of light on dark respiration under conditions in which respiratory pathways are enhanced.…”

Section: I I U I C~l C S L I M L U L R Y I C S~i I C U C a U~c I I supporting

confidence: 89%

“…Respiration is not totally suppressed al., 1988;Turpin, 1991), particularly when the endogenous leve1 of carbohydrate is high and the cells are growing (Azcon-Bieto & Osmond, 1983).…”

Section: Introductionmentioning

confidence: 99%

Light control of the respiration of exogenous glycerol in the red macroalgaGrateloupia doryphora

Robaina¹,

García‐Jiménez²,

Brito³

et al. 1995

European Journal of Phycology

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Heterotrophic activity in macroalgae has been little studied, but the red macroalga Grateloupia doryphora is known to grow in light at a higher rate in a glycerol-containing medium than in seawater. The effects of 0.1 M exogenous glycerol in seawater (SW90-gly) on the respiration rate of G. doryphova and the role played by light were investigated. The algae pretreated for 2 h in the light and in SW90-gly evolved oxygen and fixed carbon dioxide ( H~~c o , ) , but also evolved radioactive I4co2 from [L4~]glycerol. The rate of oxygen evolution was lower than that of samples in seawater, due to a high respiration rate and/or a partial inhibition of photosynthesis induced ~U L I L I~J L , LLLC t a~c ui i i i u i~a i i i c c o i v v i i i i n a i i u i i v v a~ i i i s i i c i 11non-photosynthetic patterns were operating. In darkness, after pretreatment in the light in SW90-gly, samples showed a high oxygen uptake rate just after the light was turned off. Twenty minutes of darkness were enough to decrease this high respiration rate to that of samples in seawater. The oxygen uptake observed in al1 experiments with glycerol was mitochondrial as it was inhibited by potassium a cyanide and salicylhydroxamic acid (SHAM). Pretreatment of samples in the light in SW90-gly with the photosynthetic inhibitor DCMU ! .did not inhibit ensuing dark respiration, thus providing evidence for a non-photosynthetic effect of the light. The highest dark respiration E rate was observed after the samples were pretreated in monochromatic blue light in glycerol-containing media.

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“…Combined action of photoreceptor systems is known for many physiological responses of plants, including anthocyanin synthesis (33), starch breakdown and sugar production (37,43), inhibition of stem elongation (7,13,17), leaflet opening in legumes (12,44), and stomatal opening (1,35 [KCIJ mM Tables IlIl and IV. Table I1.…”

Section: Discussionmentioning

confidence: 99%

Stimulation of Growth and Ion Uptake in Bean Leaves by Red and Blue Light

Blum

Elzenga²,

Linnemeyer³

et al. 1992

Plant Physiol.

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Red and blue light both stimulate growth and ion accumulation in bean (Phaseolus vulgaris L.) leaves, and previous studies showed that the growth response is mediated by phytochrome and a bluelight receptor. Results of this study confirm that there is an additional photosynthetic contribution from the growing cells that supports ion uptake and growth. Disc expansion in the light was enhanced by exogenous K' and Rb', but was not specific for anions. Light increased K' accumulation and the rate of 'Rb' uptake by discs, over darkness, with no effect of light quality. The photosynthetic inhibitor, 3-(3,4-dichlorophenyl)-1,1-dimethylurea, inhibited light-driven "6Rb+ uptake by 75%. Light quality caused differences in short-term kinetics of growth and acidification of the leaf surface. At comparable fluence rates (50 ,umol m-2 s-'), continuous exposure to blue light increased the growth rate 3-fold after a 2-min lag, whereas red light caused a smaller growth response after a lag of 12 min. In contrast, the acidification of the leaf surface normally associated with growth was stimulated 3-fold by red light but only slightly (1.3-fold) by blue light. This result shows that, in addition to acidification caused by red light, a second mechanism specifically stimulated by blue light is normally functioning in lightdriven leaf growth.The expansion of dicotyledonous leaves is stimulated by light acting photomorphogenically through at least two photoreceptors, phytochrome and a blue-light receptor (for review, see refs. 9 and 14). For example, in primary leaves of bean (Phaseolus vulgaris L.), red and blue light both stimulate leaf expansion, but simultaneous exposure to far-red light significantly reduces growth only in red, but not blue, light (53). Photosynthesis is not necessary for light-stimulated growth (10, 52) but may enhance growth (10, 23, 52) and is known to be necessary for some light-driven transport processes (11,27,41,46). The stimulatory effect of light on growing leaves includes cell wall loosening and solute uptake for turgor maintenance (9). Cell expansion depends on acidification of the apoplast (50) and on acid-induced wall loosening (50, 54). Acidification may also be associated with the uptake of sugars and salts that is necessary for osmotic regulation by growing cells (8,15,32,45,51 of the cells, setting up a proton motive force that is used to drive uptake of sugars and ions (38).The mechanisms underlying light-driven leaf growth were addressed in this study. The photosynthetic dependence of K+ uptake associated with growth was investigated by measuring the effect of DCMU, an inhibitor of PSII, on accumulation of K+ and uptake of 86Rb+ by leaf discs. The stimulation of K+ and Rb+ uptake by light has been observed in Nitella (28), Vallisneria (39), corn (Zea mays) (40), green bean (Phaseolus vulgaris) (19), pea (Pisum sativum) (34), and broad bean (Vicia faba) (18). Methods for studying ion uptake have included using whole cells, leaf slices and fragments, submerged leaves, and protoplasts. A ...

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Light-stimulated respiration in the green algaDunaliella tertiolecta: Involvement of the ultraviolet/blue-light photoreceptor(s) and phytochrome?

Cited by 21 publications

References 12 publications

Influence of irradiance and spectral quality on the carbon metabolism of phytoplankton I. Photosynthesis, chemical composition and growth

Influence of irradiance and spectral quality on the carbon metabolism of phytoplankton I. Photosynthesis, chemical composition and growth

Light control of the respiration of exogenous glycerol in the red macroalgaGrateloupia doryphora

Stimulation of Growth and Ion Uptake in Bean Leaves by Red and Blue Light

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