Der Gasaustausch der Flechten

Stålfelt, M. G.

doi:10.1007/bf01909088

Cited by 76 publications

(16 citation statements)

References 8 publications

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“…According to the present literature, the situation for lichens is also not so clear. Differences in respiration rates between seasons were already reported by Stålfelt (1938) for Ramalina farinacea. Larson and Kershaw (1975) reported acclimation of net photosynthetic rate for Cetraria nivalis measured in the summer and winter whilst Larson (1980) from a larger survey reported that net photosynthesis could both increase and decrease through the year depending on species but that temperature response of respiration did not change substantially.…”

Section: Introductionmentioning

confidence: 56%

“…Lichens are also known as usually being slow-growing organisms but it is clear that their metabolic processes are as equally responsive as other organisms. Acclimation must be fast because the lichens were often only active for a few hours per day and it may be possible that we have greatly underestimated the ability of lichens to adapt to changing habitat conditions, an ability first reported in the classic paper of Stålfelt (1938). In one of the few reports on acclimation to low temperatures by fungi it was found that a 2 h treatment was sufficient to produce a change in low temperature tolerance for Fusarium oxysporum f.sp.…”

Section: Discussionmentioning

confidence: 95%

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Lichens show that fungi can acclimate their respiration to seasonal changes in temperature

Lange

Green

2004

Oecologia

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Five species of lichens, the majority members of a soil-crust community ( Cladonia convoluta, Diploschistes muscorum, Fulgensia fulgens, Lecanora muralis, Squamarina lentigera) showed seasonal changes of temperature sensitivity of their dark respiration (DR) to such an extent that several substantially met the definition of full acclimation, i.e. near identical DR under different nocturnal temperature conditions during the course of the year. C. convoluta, for example, had maximal DR at 5 degrees C of -0.42, -1.11 and -0.09 nmol CO(2) g(-1) s(-1) in autumn, winter, and summer, respectively, a tenfold range. However, at the mean night temperatures for the same three seasons, 9.7 degrees C, 4.2 degrees C and 13.6 degrees C, maximal DR were almost identical at -1.11, -0.93, and -1.45 nmol CO(2) g(-1) s(-1). The information was extracted from measurements using automatic cuvettes that continuously recorded a sample lichen's gas exchange every 30 min under near-natural conditions. The longest period (for L. muralis) covered 15 months and 22,000 data sets whilst, for the other species studied, data blocks were available throughout the calendar year. The acclimation of DR means that maximal net carbon fixation rates remain substantially similar throughout the year and are not depressed by increased carbon loss by respiration in warmer seasons. This is especially important for lichens because of their normally high rate of DR compared to net photosynthesis. We suggest that lichens, especially soil-crust species, could be a suitable model for fungi generally, a group of organisms for which little is known about temperature acclimation because of the great difficulty in separating the organism from its growth medium. Fungi, whether saprophytic, symbiotic or parasitic, including soil lichens, are important components of soil ecosystems and contribute much of the respired CO(2) from these systems. Temperature acclimation by fungi would mean that expected increases in carbon losses caused by global climate warming from soil ecosystems might not be as extensive as first thought. This would ameliorate this positive feedback loop present in some climate models and might substantially lower the predicted warming.

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Section: Introductionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 95%

Lichens show that fungi can acclimate their respiration to seasonal changes in temperature

Lange

Green

2004

Oecologia

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“…Stalfelt (1939) quotes the dark respiration rates of four species at two times of the year and gives Qo1 values for a range of temperatures. Stalfelt (1939) quotes the dark respiration rates of four species at two times of the year and gives Qo1 values for a range of temperatures.…”

Section: Physiological Measurements Previous Work On the Photosynthesmentioning

confidence: 99%

“…Smith (1962) and Quispel (1960). Smyth 1934;Stalfelt 1939;Fraymouth 1928). Smyth 1934;Stalfelt 1939;Fraymouth 1928).…”

Section: Introductionunclassified

The Ecology of Corticolous Lichens: II. The Relationship Between Physiology and the Environment

Harris¹

1971

The Journal of Ecology

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“…The different temperature responses of photosynthesis and respiration are known to produce maximal apparent photosynthesis at about 15°C (21,24). The concensus of recent work on the temperature dependence of net photosynthesis in northern graminaceous plants is also indicative of maximal net photosynthesis at about this temperature (6,16,21,23,25,26,28), especially as considered for the whole plant over the time scale of growth measurements.…”

Section: °C Growth Maximummentioning

confidence: 99%

Growth kinetics of Marquis wheat. IV. Temperature dependence

Macdowall¹

1973

Can. J. Bot.

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Earlier described data froni this laboratory were subjected to primary growth analysis. The plants had been grown in constant conditions of light intensity (200 to 2500ft-c) and teniperature (10' to 30°C) at five different settings each. Multiple temperature optima were revealed and interpreted. The computed maximum plant growth coefficient was highest in value at 25°C (plant k r n~ = 0.44 day-1) and secondarily so at 15OC, but a t the experimental light intensities the plant growth coefficient was maximal at 15OC. The higher temperature optimum was characteristic of roots and "stenis" (stem plus leaf sheaths) whose

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Der Gasaustausch der Flechten

Cited by 76 publications

References 8 publications

Lichens show that fungi can acclimate their respiration to seasonal changes in temperature

Lichens show that fungi can acclimate their respiration to seasonal changes in temperature

The Ecology of Corticolous Lichens: II. The Relationship Between Physiology and the Environment

Growth kinetics of Marquis wheat. IV. Temperature dependence

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