Physiological Ecology of CO2 Fixation in Bromeliaceae

Medina, Ernesto; Delgado, Mabel; Troughton, John H.; Medina, Jackeline

doi:10.1016/s0367-2530(17)32126-6

Cited by 104 publications

(67 citation statements)

References 30 publications

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“…Under conditions of constant temperature and RH throughout the day and night, they observed maximal CO2 uptake rates at 15 and 20 C and inhibition of CO2 uptake at 25 C and above. The responses to low nighttime temperature (5 C and below) were similar in the two studies.…”

Section: Resultsmentioning

confidence: 97%

Crassulacean Acid Metabolism in the Epiphyte Tillandsia usneoides L. (Spanish Moss)

Martin

Siedow²

1981

Plant Physiol.

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Patterns of CO2 exchange in Spanish moss under various experimental conditions were measured using an infrared gas analysis system. Plants were collected from a study site in North Carolina and placed in a gas exchange chamber for several days of continuous measurements. No substantial seasonal effects on CO2 exchange were observed. High rates of nocturnal CO2 uptake were observed under day/night temperature regimes of 25/10, 25/15, 25/20, 30/20, and day/night cycle) did not realistically approximate field conditions; and they used glasshouse-grown Spanish moss of unstated origin. It was the purpose of this study to examine CO2 exchange of field-collected Spanish moss in the laboratory, using controlled conditions which approximated those found in the field in North Carolina. Such controlled experiments should help explain the results of the field studies (14). MATERIALS AND METHODSNet CO2 exchange in strands of Spanish moss (Tillandsia usneoides L.) sealed in a chamber was monitored continuously during 4-to 6-day intervals with a Beckman IR215 Infrared Gas Analyzer (differential; open system) from June to December 1979. The CO2 concentration of the incoming air was approximately 360 ptl -. I and varied up to 50 ttl -I`on a diurnal basis; however, the changes in CO2 concentration were too gradual to be detected by the analyzer in the differential mode. Before analysis, the air was dried by condensation and passage through ZnCl2. Calibrations of the IR gas analyzer were made frequently.The air stream was humidified by passage through water and its dew point determined with an EG&G Model 880 dew point hygrometer. All tubing in the system was Tygon. Air flowed into the plant chamber at a rate of 500 ml-min-'. The chamber was a double-walled glass column approximately 45 cm long, with an inner diameter of 2.5 cm and a total inner volume of 250 ml. The double wall acted as a water jacket which allowed precise control of chamber air temperatures. Gaastra (5) has discussed a potential problem in the use of long, tubular chambers. Calculations based on maximal rates of CO2 exchange observed in Spanish moss found the problem of linearly changing CO2 concentration as the air flows over the plant due to CO2 exchange by the plant to be insignificant given the very low CO2 exchange rates of Spanish moss.Lighting was provided by a 400 w multi-vapor high intensity 335 www.plantphysiol.org on May 11, 2018 -Published by Downloaded from

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Section: Resultsmentioning

confidence: 97%

Crassulacean Acid Metabolism in the Epiphyte Tillandsia usneoides L. (Spanish Moss)

Martin

Siedow²

1981

Plant Physiol.

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“…However, a fair number of other examples are now also given in the literature, where true stress induces features of CAM in short-term or in seasonal shifts, e.g. in Portulacaria and Peperomia (Hanscom & Ting, 1978;Guralnick, Rorabaugh & Hanscom, 1984;Guralnick & Ting, 1986) and Sedum species (Kluge, 1977;Lee & Griffiths, 1987), in the epiphytic Crassulaceae Kalanchoe unifiora (Schafer & Luttge, 1986) and the epiphytic bromeliad Guzmania monostachia (Medina et al, 1977). Figure 8 compares some field measurements on epiphytic bromeliads performed in Trinidad during the dry season in March (Griffiths et al, 1986).…”

Section: Comparison Between Two Cam Species and Seasonal Change Of Stmentioning

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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“…There have been numerous studies of the responses of C3 species to sun and shade (4), yet little characterization of CAM plants grown under different PFD.3 Many horticultural CAM plants are grown indoors in dim light, and many other CAM plants grow naturally in deep shade as rainforest epiphytes (3,13,16,25), but little is known of the effects of shade on CAM. Our lack of understanding of these responses is due, in large part, to the complicated gas exchange characteristics exhibited by plants possessing CAM (19).…”

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confidence: 99%

Responses of Two CAM Species to Different Irradiances during Growth and Susceptibility to Photoinhibition by High Light

Adams¹,

Osmond²,

Sharkey³

1987

Plant Physiol.

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Two CAM species, Kalanchoe daigremontiana Hamet et Perrier and Hoya carnosa (L.) R. Br., were grown under a range of five photon flux area densitites (PFD) and then characterized. Significant acclimation to shade was indicated by progressive decreases in leaf thickness, rates of respiratory 02 uptake, light compensation point, maximum rates of photosynthetic 02 evolution, nocturnal acid accumulation, and 653C values, and increases in chlorophyll concentration and absolute levels of room temperature (25°C) and 77K fluorescence. Quantum yields (as measured by 02 exchange) and the ratio of variable 77K fluorescence over the maximum yield (F,/F,)

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Physiological Ecology of CO2 Fixation in Bromeliaceae

Cited by 104 publications

References 30 publications

Crassulacean Acid Metabolism in the Epiphyte Tillandsia usneoides L. (Spanish Moss)

Crassulacean Acid Metabolism in the Epiphyte Tillandsia usneoides L. (Spanish Moss)

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

Responses of Two CAM Species to Different Irradiances during Growth and Susceptibility to Photoinhibition by High Light

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