Crassulaceen-Säurestoffwechsel (CAM) bei mitteleuropäischen Sukkulenten: Ökologische Untersuchungen an Sempervivum-Arten1)1)Herrn Professor Dr. O. Stocker zum 90. Geburtstag gewidmet.

Schuber, Marianne; Kluge, Manfred

doi:10.1016/s0367-2530(17)31905-9

Cited by 14 publications

(3 citation statements)

References 14 publications

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“…There is both COg fixation via PEP-C and direct fixation via RUBISCO with light-dependent COg assimilation. Phase II is often characterized by a peak of COg uptake, which can be observed under controlled-environment and field conditions (Lange et al, 1975;Nobel, 1976;Schuber & Kluge, 1979, 1981Winter & Tenhunen, 1982;Acevedo, Badilla & Nobel, 1983; Venezuela IV*). However, frequently such a peak is absent (Liittge et al, 1986b) or there is only a shoulder in the rapid decline of net COg uptake in the first part of phase II (Venezuela V).…”

Section: Cam: Versatile Responses Of Metabolic Options To Environmentmentioning

confidence: 99%

Carbon Dioxide and Water Demand: Crassulacean Acid Metabolism (Cam), a Versatile Ecological Adaptation Exemplifying the Need for Integration in Ecophysiological Work

Lüttge

1987

New Phytologist

179

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Summary Plants having crassulacean acid metabolism (CAM) tend to occupy habitats where the prevailing environmental stress is scarcity of water. These are semi‐arid or arid regions, salinas or epiphytic sites. CAM plants manage the dilemma of desiccation or starvation by nocturnal malic acid accumulation in the vacuoles. Malic acid serves as a form of CO2 storage and as an osmoticum. In this way malic acid accumulation allows, firstly, separation of uptake and assimilation of atmospheric CO2 with water‐saving daytime stomatal closure and, secondly, osmotic acquisition of water. There is no very special trait which is specific for CAM. An array of biophysical and biochemical functional elements, which are also found in other plants, is integrated in CAM performance. This leads to a large diversity of behaviour which makes CAM plants highly versatile in their response to environmental variables. Besides CO2 dark fixation, transport of malic acid across the tonoplast is one of the key elements in CAM function. This is examined in detail at the level of membrane biophysics and biochemistry. The versatility of CAM is illustrated by examples from field work, with comparisons involving different species, seasons, modes of photosynthesis (CAM vs C3), kinds of stress and ways of stress imposition.

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Section: Cam: Versatile Responses Of Metabolic Options To Environmentmentioning

confidence: 99%

Carbon Dioxide and Water Demand: Crassulacean Acid Metabolism (Cam), a Versatile Ecological Adaptation Exemplifying the Need for Integration in Ecophysiological Work

Lüttge

1987

New Phytologist

179

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“…Species of the genus Caral-currence of this phenomenon in some CAM species but luma (Lange et al 1975, Lange andZuber 1980), Sem-not in others. Since an increase in temperature can enpervivum (Schuber and Kluge 1979) and Sedum hance net CO; output (Schuber andKluge 1979, Lange (Schuber andKluge 1981) typically show this phenom-and Zuber 1980), it is conceivable that metabolic pro-cesses, presumably malate decarboxylation and respiration, play a major role. On the other hand, gas exchange across the epidermis in terrestrial plants is mainly controlled by the stomata.…”

Section: Introductionmentioning

confidence: 99%

Net CO₂ output by CAM plants in the light: the role of leaf conductance

Frimert

Kluge

Smith

1986

Physiologia Plantarum

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The reasons for CO2 release by some CAM plants during the light period were investigated by comparative gas‐exchange studies with three leaf‐succulent species, Kalanchoë tubiflora Hamet, Sedum morganianum E. Walth. and Sempervivum tectorum L. Sempervivum showed net CO2 output during the day at constant day‐night temperatures of both 15 and 25°C, whereas Kalanchoë and Sedum showed no CO2 release at this time at either temperature. Net nocturnal CO2 uptake was markedly reduced at 25°C compared with 15°C in Kalanchoë and Sempervivum, while CO2 was released at night at higher temperature by Sedum if leaf/air vapour pressure difference was also increased. Values for intercellular partial pressure of CO2 (piCO2) were calculated from leaf conductance and were characteristically lowest in the dark and highest in the light period. Maximum values of piCO2 ranged from 264 Pa in Sedum to 87 Pa in Kalanchoë, but were somewhat lower than those reported from direct measurements of the gas phase in other CAM plants. Leaf conductance declined with increasing piCO2 in all three species. Minimum values of approximately 0.2 mmol m−2 s−1 were observed at piCO2= 33 Pa in Kalanchoë and Sedum, with no further decrease at higher piCO2, implying that this largely represented the conductance of the cuticle. In Sempervivum, however, leaf conductance declined more gradually, and was as much as 0.8 mmol m−2 s−1 at the highest observed values of piCO2. The cause of net CO2 output in the light by Sempervivum thus appeared to be lower stomatal sensitivity to CO2, resulting in relatively high leaf conductance even at times when piCO2 greatly exceeded that of ambient air.

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“…An heißen Tagen be schränkt sich die C0 2 -Aufnahme auf die ersten Stunden der Lichtzeit (vgl. , SCHUBER und KLUGE 1979.…”

Section: Time Of Day ( Hours)unclassified

Crassulacean Acid Metabolism (CAM): Einige stoffwechselphysiologische und ökologische Aspekte

Kluge¹

1979

Berichte der Deutschen Botanischen Gesellschaft

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Crassulaceen-Säurestoffwechsel (CAM) bei mitteleuropäischen Sukkulenten: Ökologische Untersuchungen an Sempervivum-Arten1)1)Herrn Professor Dr. O. Stocker zum 90. Geburtstag gewidmet.

Cited by 14 publications

References 14 publications

Carbon Dioxide and Water Demand: Crassulacean Acid Metabolism (Cam), a Versatile Ecological Adaptation Exemplifying the Need for Integration in Ecophysiological Work

Carbon Dioxide and Water Demand: Crassulacean Acid Metabolism (Cam), a Versatile Ecological Adaptation Exemplifying the Need for Integration in Ecophysiological Work

Net CO₂ output by CAM plants in the light: the role of leaf conductance

Crassulacean Acid Metabolism (CAM): Einige stoffwechselphysiologische und ökologische Aspekte

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Crassulaceen-Säurestoffwechsel (CAM) bei mitteleuropäischen Sukkulenten: Ökologische Untersuchungen an Sempervivum-Arten1)1)Herrn Professor Dr. O. Stocker zum 90. Geburtstag gewidmet.

Cited by 14 publications

References 14 publications

Carbon Dioxide and Water Demand: Crassulacean Acid Metabolism (Cam), a Versatile Ecological Adaptation Exemplifying the Need for Integration in Ecophysiological Work

Carbon Dioxide and Water Demand: Crassulacean Acid Metabolism (Cam), a Versatile Ecological Adaptation Exemplifying the Need for Integration in Ecophysiological Work

Net CO2 output by CAM plants in the light: the role of leaf conductance

Crassulacean Acid Metabolism (CAM): Einige stoffwechselphysiologische und ökologische Aspekte

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Net CO₂ output by CAM plants in the light: the role of leaf conductance