Summary
Interrelationships between morphology, microhabitat, water relations, and photosynthesis of a xeric fern, Notholaena parryi D.C. Eat. (Pteridaceae), were examined in the western Colorado desert. In its typical microhabitat rock outcroppings protected N. parryi from direct sunlight and moderated the diurnal variations in air temperature. For example, frond temperature at noon in late winter was 15.3° C, which was 7.3° C cooler than an energy budget simulation predicting frond temperature at an exposed site. The lowest soil water potential leading to daytime stomatal opening was about-1.5 MPa (-15 bars). Rainfall runoff that was channeled to the periphery of the rocks caused Ψsoil near the fern roots to rise above-1.5 MPa even after light rainfalls, and it remained above-1.5 MPa longer after rainfall than in non-rocky sites.
The water potential gradient along the stipe necessary to support the observed rates of transpiration was about-10 MPa m-1; such a large gradient reflected the small conducting area in the xylem. The water vapor conductance decreased as the frond temperature was raised, an effect that became proportionally greater as the soil dried out. The daytime water-use efficiency (mass CO2 fixed/mass water transpired) was 0.0058 for a spring day. Individual fronds reached 90% of light saturation for photosynthesis at only 100 μEinsteins m-2 s-1, a photosynthetically active radiation similar to that from the diffuse sunlight incident on the generally north-facing microhabitat of the fern. Below 50 μE m-2 s-1 the quantum requirement was 13 Einsteins absorbed/mole CO2 fixed. The ratio of chlorophyll to P700 was 552, indicating a fairly large photosynthetic unit that is characteristic of plants adapted to shaded habitats. The temperature optimum for net photosynthesis shifted from 13° C in midwinter (mean daily air temperature of 11° C) to 19° C in early fall (air temperature of 23° C).
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References
Alberte, R.S., McClure, P.R., Thornber, J.P.: Photosynthesis in trees. Organization of chlorophyll and photosynthetic unit size in isolated gymnosperm chloroplasts. Plant Physiol. 58, 341–344 (1976)
Arnon, D.I.: Copper enzymes in isolated chloroplasts. Polyphenoloxidase in Beta vulgaris. Plant Physiol. 24, 1–15 (1949)
Billings, W.D., Morris, R.J.: Reflection of visible and infrared radiation from leaves of different ecological groups. Amer. J. Bot. 38, 327–331 (1951)
Caldwell, M.M., Moore, R.T.: A portable small stage photoelectric planimeter for leaf area measurements. J. Range Management 24, 394–395 (1971)
Danin, A.: Mediterranean elements in rocks of the Negev and Sinai deserts. Roy. Bot. Garden, Edinburgh, Notes 31, 437–440 (1972)
Ehleringer, J., Björkman, O.: Quantum yields for CO2 uptake in C3 and C4 plants. Dependence on temperature, CO2, and O2 concentrations. Plant Physiol. 59, 86–90 (1977)
Grillos, S.J.: Ferns and fern allies of California, 104 pp. Berkeley: Univ. California Press 1966
Hall, A.E., Schulze, E.-D., Lange, O.L.: Current perspectives of steady-state stomatal responses to environment. In: Water and plant life — problems and modern approaches. Ecological studies series, Vol. 19 (O.L. Lange, L. Kappen, E.-D. Schulze, eds.), pp. 169–188. Berlin-Heidelberg-New York: Springer 1976
Hellkvist, J., Richards, G.P., Jarvis, P.G.: Vertical gradients of water potential and tissue water relations in Sitka spruce trees measured with the pressure chamber. J. Appl. Ecol. 11, 637–667 (1974)
Hevly, R.H.: Adaptations of cheilanthoid ferns to desert environments. J. Arizona Acad. Sci. 2, 164–175 (1963)
Hill, R.H.: Comparative patterns of CO2 exchange of three fern species of southeastern Michigan. Mich. Acad. 4, 303–310 (1972)
Hillel, D., Tadmor, N.: Water regime and vegetation in the central Negev highlands of Israel. Ecology 43, 33–41 (1962)
Knoblock, I.W., Volz, P.A.: Studies in the fern genus Cheilanthes Swartz — I. The leaf blade anatomy of some species of the genus. Phytomorphology 14, 508–527 (1964)
Lange, O.L., Schulze, E.-D., Evenari, M., Kappen, L., Buschbom, U.: The temperature-related photosynthetic capacity of plants under desert conditions. I. Seasonal changes of the photosynthetic response to temperature. Oecologia (Berl.) 17, 97–110 (1974)
Maeda, O.: On the dry matter productivity of two ferns, Osmunda cinnamomea and Dryopteris crassirhizoma, in relation to their geographical distribution in Japan. Jap. J. Bot. 20, 237–267 (1970)
Marsh, A.S.: The anatomy of some xerophilous species of Cheilanthes and Pellaea. Ann. Bot. 28, 671–684 (1914)
Mooney, H.A., Björkman, O., Berry, J.: Photosynthetic adaptations to high temperature. In: Environmental physiology of desert organisms (N.F. Hadley, ed.), pp. 138–151. Stroudsburg, Pa.: Dowden, Hutchinson, & Ross 1975
Nayar, B.K.: The morphology of some species of Cheilanthes. J. Linn. Soc. (Lond.), Bot., 58, 449–460 (1962)
Nisbet, R.A., Patten, D.T.: Seasonal temperature acclimation of a prickly-pear cactus in south-central Arizona. Oecologia (Berl.) 15, 345–352 (1974)
Nobel, P.S.: An introduction to biophysical plant physiology, 488 pp. San Francisco: Freeman 1974
Nobel, P.S.: Water relations and photosynthesis of a desert CAM plant, Agave deserti. Plant Physiol. 58, 576–582 (1976a)
Nobel, P.S.: Photosynthetic rates of sun versus shade leaves of Hyptis emoryi Torr. Plant Physiol. 58, 218–223 (1976b)
Nobel, P.S.: Internal leaf area and cellular CO2 resistance: Photosynthetic implications of variations with growth conditions and plant species. Physiol. Plant. 40, 137–144 (1977)
Nobel, P.S., Zaragoza, L.J., Smith, W.K.: Relation between mesophyll surface area, photosynthetic rate, and illumination level during development for leaves of Plectranthus parviflorus Henckel. Plant Physiol. 55, 1067–1070 (1975)
Noy-Meir, I., Orshan, G., Tadmor, N.H.: Multivariate analysis of desert vegetation. III. The relation of vegetation units to habitat classes. Israel J. Bot. 22, 239–257 (1973)
Oppenheimer, H.R.: Adaptation to drought: Xerophytism. In: Plant-water relationships in arid and semi-arid conditions, pp. 105–138. Paris: UNESCO 1960
Oppenheimer, H.R., Halevy, A.H.: Anabiosis of Ceterach officinarum Lam. et Dc. Bull. Res. Counc. Israel, Bot. 11D, 127–147 (1962)
Rabinowitch, E.: Photosynthesis and related processes, Vol. II, Part 1, 1208 pp. New York: Interscience 1951
Rejmánek, M.: Ecological meaning of the thermal behaviour of rocks. Flora 160, 527–561 (1971)
Schulze, E.-D.: Die Wirkung von Licht und Temperatur auf den CO2-Gaswechsel verschiedener Lebensformen aus der Krautschicht eines montanen Buchenwaldes. Oecologia (Berl.) 9, 235–258 (1972)
Schulze, E.-D., Lange, O.L., Kappen, L., Buschbom, U., Evenari, M.: Stomatal responses to changes in temperature at increasing water stress. Planta (Berl.) 110, 29–42 (1973)
Shiozawa, J.A., Alberte, R.S., Thornber, J.P.: The P700-chlorophyll a-protein. Isolation and some characteristics of the complex in higher plants. Arch. Biochem. Biophys. 165, 388–397 (1974)
Smith, W.K., Nobel, P.S.: Influences of seasonal changes in leaf morphology on water-use efficiency for three desert broadleaf shrubs. Ecology 58 (in press, 1977)
Sparling, J.H.: Assimilation rates of some woodland herbs in Ontario. Bot. Gaz. 128, 160–168 (1967)
Szarek, S.R., Ting, I.P.: Photosynthetic efficiency of CAM plants in relation to C3 and C4 plants. In: Environmental and biological control of photosynthesis (R. Marcelle, ed.), pp. 289–297. The Hague: Junk 1975
Walter, H., Stadelmann, E.: A new approach to the water relations of desert plants. In: Desert biology, Vol. II (G.W. Brown, Jr., ed.), pp. 213–310. New York: Academic Press 1974
Witham, H.V.: Ferns of the Colorado desert. California Native Plant Soc. Newsletter 8, 10–13 (1972)
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Nobel, P.S. Microhabitat, water relations, and photosynthesis of a desert fern, Notholaena parryi . Oecologia 31, 293–309 (1978). https://doi.org/10.1007/BF00346249
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DOI: https://doi.org/10.1007/BF00346249