Epidermal cells functioning as lenses in leaves of tropical rain-forest shade plants.

A ray tracing model has been developed to investigate the possible focusing effects of the convexly curved epidermal cell walls which characterize a number of shade-adapted plants. The model indicates that such focusing occurs, resulting in higher photosynthetic photon flux densities at certain locations within the leaf. It is postulated that there will be a corresponding increase in the rate of photosynthesis. In addition, leaf reflectance measurements indicate that this is generally less for the shade plants compared with sun species and would be advantageous in increasing the efficiency of energy capture. Either effect is important for plants which must survive at extremely low light levels.

[1]  C. Osmond,et al.  Physiological Plant Ecology I , 1981, Encyclopedia of Plant Physiology.

[2]  Lars Olof Björn,et al.  Measurement of light gradients and spectral regime in plant-tissue with a fiber optic probe , 1984 .

[3]  W. Haupt.  Light-Mediated Movement of Chloroplasts , 1982 .

[4]  J. Raven,et al.  The lower limit of photon fluence rate for phototrophic growth: the significance of ‘slippage’ reactions , 1982 .

[5]  S. Pickett,et al.  PHYSIOLOGICAL ECOLOGY OF TROPICAL SUCCESSION: A Comparative Review , 1980 .

[6]  T. Givnish.  Leaf and Canopy Adaptations in Tropical Forests , 1984 .

[7]  Katherine Richardson,et al.  ADAPTATION OF UNICELLULAR ALGAE TO IRRADIANCE: AN ANALYSIS OF STRATEGIES , 1983 .

[8]  David W. Lee,et al.  ULTRASTRUCTURAL BASIS AND DEVELOPMENTAL CONTROL OF BLUE IRIDESCENCE IN SELAGINELLA LEAVES , 1984 .

[9]  N. H. Williams,et al.  Surface features of the adaxial epidermis in the conduplicate‐leaved Cypripedioideae (Orchidaceae) , 1979 .

[10]  G. Senn.  Die Gestalts- und Lageveränderung der Pflanzen-Chromatophoren , 1910, Nature.

[11]  J. Norman,et al.  Photosynthesis in Sitka spruce (Picea sitchensis (Bong.) Carr.). V. Radiation penetration theory and a test case , 1975 .

[12]  R. Chazdon,et al.  Light Environments of Tropical Forests , 1984 .

[13]  A. Scholz.  Lichtorientierte Chloroplastenbewegung bei Hormidium flaccidum: Verschiedene Methoden der Lichtrichtungsperception und die wirksamen Pigmente , 1976 .

[14]  M Seyfried,et al.  Light gradients in plant tissue. , 1983, Applied optics.

[15]  K. Yoda.  THREE-DIMENSIONAL DISTRIBUTION OF LIGHT INTENSITY IN A TROPICAL RAIN FOREST OF WEST MALAYSIA , 1974 .

[16]  R. C. Weast.  Handbook of chemistry and physics , 1973 .

[17]  Y. Ogura.  Comparative Anatomy of Vegetative Organs of the Pteridophytes , 1973 .

[18]  R. Jagels.  Photosynthetic apparatus in Selaginella. I. Morphology and photosynthesis under different light and temperature regimes , 1970 .