Abstract
CO2 fixation was studied in a lichen, Xanthoria parietina, kept in continuous light, and with cyclic changes in light intensity, dark period or temperature. The diurnal and seasonal courses of CO2 exchange were followed. The rate of net photosynthesis was observed to fall from morning to evening, and this decline was more pronounced in winter than in summer. The maximal net photosynthetic rate, 223 ng CO2g-1dws-1, occured in winter and the minimum, 94 ng CO2g-1dws-1, late in spring. The light compensation point in summer was four times as high as in winter. In continuous light (180 or 90 μmol photons m-2s-1, 15°C) net photosynthesis decreased noticeably during one week, falling below the level maintained in a 12 h light: 12 h dark cycle. Photosynthetic activity did not decrease, however, in lichens held in continuous light (90 μmol photons m-2s-1) with cyclic changes of temperature (12 h 20 °C: 12 h 5 °C). Active photosynthesis was also maintained in light of cyclically changing intensity (12 h: 12 h, 15 °C) when night-time light was at least 75% lower than illumination by day. A dark period of 4 hours in a 24-h light:dark cycle was sufficient to keep CO2 fixation at the control level. It seems that plants need an unproductive period during the day to survive and this can be induced by fluctuations in light and/or temperature.
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References
Aro E-M and Valanne N (1979) Effects of continuous light on CO2 fixation and chloroplast structure of the mosses Pleurozium schreberi and Ceratodon purpureus. Physiol Plant 45:460–466
Büttner R (1971) Untersuchungen zur Okologie und Physiologie des Gasstoffwechsels bei einigen Strauchflechten. Flora 160:72–99
Descomps S and Deroche M-E (1973) Action de l'éclairement continu sur l'appareil photosynthétique de la Tomate. Physiol Vég 11:615–631
Harris G and Kershaw K (1971) Thallus growth and the distribution of stored metabolites in the phycobionts of the lichens Parmelia sulcata and P. physodes. Can J Bot 49:1367–1372
Heide O (1974) Growth and dormancy in Norway spruce ecotypes (Picea abies) I. Interaction of photoperiod and temperature. Physiol Plant 30:1–12
Huber DJ and Newman DW (1976) Relationships between lipid changes and plastid ultrastructural changes in senescing and regreening soy-bean cotyledons. J Exp Bot 27:490–511
Jacob F (1959) Zur Kenntnis der Lichtwirkung auf die Entwicklung der Sporangienträger der Sammelart Pilobolus kleinii von Tiegheim. Arch Mikrobiol 33:83–104
Kallio P (1953) The effect of continued illumination of the desmids. Arch Soc Vanamo 8:58–72
Kallio P and Heinonen S (1971) Influence of short term low temperature on net photosynthesis in some subarctic lichens. Rep Kevo Subarctic Res Stat 8:63–72
Kallio P and Heinonen S (1973) Ecology of Rhacomitrium lanuginosum (Hedw.) Brid. Rep Kevo Subarctic Res Stat 10:43–54
Kallio P (1975) The influence of continuous light on lichens and mosses. Proceedings of the circumpolar conference on northern ecology, pp. 15–18. Ottawa
Kallio P and Kärenlampi L (1975) Photosynthesis in mosses and lichens. In: Cooper J (ed.) International biological programme 3. Photosynthesis and productivity in different environments, pp. 393–425. Cambridge: Cambridge University Press
Kallio P and Valanne N (1975) On the effect of continuous light on photosynthesis in mosses. In: Wielkolaski F (ed.) Ecological studies. Analysis and synthesis, Vol 16. Fennoscandian tundra ecosystems, Part 1, pp. 149–162. Berlin-Heidelberg-New York: Springer-Verlag
Kallio S, Kallio P and Rasku M-L (1976) Ecology of nitrogen fixation in Peltigera aphthosa (L.) Willd. in North Finland. Rep Subarctic Res Stat 13:16–22
Kershaw K (1977) Physiological-environmental interactions in lichens. II. The pattern of net photosynthetic acclimation in Peltigera canina (L.) Willd. var. praetextata (Floerke in Somm.) Hue, and P. polydactyla (Neck.) Hoffm. New Phytol 79:391–402
Kershaw K and Smith M (1978) Studies on lichen-dominated systems. XXI. The control of seasonal rates of net photosynthesis by moisture, light and temperature in Stereocaulon paschale. Can J Bot 56:2825–2830
Pearson L (1970) Varying environmental factors in order to grow intact lichens under laboratory conditions. Amer J Bot 57:659–664
Rastorfer J (1970) Effects of light intensity and temperature on photosynthesis and respiration of two antarctic mosses, Bryum argenteum and B. antarcticum. Bryol 73:544–556
Ruddat M (1960) Versuche zur Beeinflussung und Auslöosung der endogenen Tagesrhythmik bei Oedogonium cardiacum Wittr. Z Bot 49:23–46
Smith D (1961) The physiology of Peltigera polydactyla (Neck.) Hoffm. Lichenol 1:209–226
Smith D and Drew E (1965) Studies in the physiology of lichens. V. Translocation from the algal layer to the medulla in Peltigera polydactyla. New Phytol 64:195–200
Valanne N (1976) Effect of continuous light on CO2 fixation, chlorophyll content, growth and chloroplast structure in Ceratodon purpureus. Z Pflanzenphysiol 81:347–357
Valanne N (1977) The combined effects of light intensity and continuous light on the CO2 fixation, chlorophyll content and chloroplast structure of the protonemata of Ceratodon purpureus. Z. Pflanzenphysiol 83:275–283
Wilkins M (1960) An endogenous rhythm in the rate of CO2 output of Bryophyllum. II. The effects of light and darkness on the phase and period of the rhythm. J Exp Bot 11:269–288
Wolinska D (1976) Functional and structural changes in chloroplasts of senescent tobacco leaves. Acta Soc Bot Pol 45:341–351
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Korhonen, P., Kallio, P. The effect of different night conditions on the CO2 fixation in a lichen Xanthoria parietina . Photosynth Res 12, 3–11 (1987). https://doi.org/10.1007/BF00019146
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DOI: https://doi.org/10.1007/BF00019146