Results 171 to 180 of about 226,985 (210)

Why are evergreen leaves so contrary about shade?

Trends in Ecology & Evolution, 2008
Leaf mass per area (LMA) is one of the most widely measured of all plant functional traits. In deciduous forests, there is similarity between plastic and evolutionary responses of LMA to light gradients. In evergreens, however, LMA is lower in shaded than sunlit individuals of the same species, whereas shade-tolerant evergreens have higher LMA than ...
Lusk, Christopher H., Reich, Peter B., Montgomery, Rebecca A., Ackerly, David D., Cavender-Bares, Jeannine   +4 more
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Sun and shade leaves: some field investigations

Journal of Biological Education, 1983
Some simple investigations can be carried out to demonstrate how light regime affects the final form of ...
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"Sun Leaves" and "Shade Leaves": Differences in Convective Heat Dissipation

Ecology, 1968
Temperatures of radiantly heated sun and shade leaves of white oak (Quercus alba L.) were measured in a low—speed wind tunnel. In either still air or a gentle updraft the difference between ambient and leaf temperature is about 20% less for the sum leaves than for the shade leaves. Consequently the former are more effective heat dissipaters.
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Photosynthetic symmetry of sun and shade leaves of different orientations

Oecologia, 1991
The photosynthetic responses to light of leaves irradiated on the adaxial or abaxial surfaces, were measured for plants with contrasting leaf orientations. For vertical-leaf species of open habitats (Eryngium yuccifolium and Silphium terebinthinaceum), photosynthetic rates were identical when irradiated on either surface.
Evan H, De Lucia, Hemanth D, Shenoi, Shawna L, Naidu, Thomas A, Day   +3 more
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Adjustments in epidermal UV‐transmittance of leaves in sun‐shade transitions

Physiologia Plantarum, 2013
Epidermal UV transmittance (TUV) and UV‐absorbing compounds were measured in sun and shade leaves of Populus tremuloides and Vicia faba exposed to contrasting light environments under field conditions to evaluate UV acclimation potentials and regulatory roles of photosynthetically active radiation (PAR) and UV in UV‐shielding.
Barnes, Paul W., Kersting, Anna R., Flint, Stephan D., Beyschlag, Wolfram, Ryel, Ronald J.   +4 more
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THE DEVELOPMENTAL RESPONSES OF PAPAYA LEAVES TO SIMULATED CANOPY SHADE

American Journal of Botany, 1993
The developmental responses of plants to shade underneath foliage are influenced by reductions in irradiance and shifts in spectral quality (characterized by reductions in the quantum ratio of red to far‐red wavelengths, R:FR). Previous research on the influence of shadelight on leaf development has neglected the reductions in R:FR characteristic of ...
Buisson, Daniel, Lee, David W.
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Leaf Physiology of Shade-Grown Cycas micronesica Leaves Following Removal of Shade

The Botanical Review, 2004
I. Abstract The photosynthetic characteristics of Cycas micronesica K.D. Hill were studied from August 1998 until February 1999 using chlorophyll fluorescence and gas-exchange techniques to determine the responses to long-term shade of 35% ambient light transmission, followed by the transfer of shade-grown leaves into full-sun conditions.
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Exposed red (anthocyanic) leaves of Quercus coccifera display shade characteristics

Functional Plant Biology, 2003
Young leaves in some plants are transiently red due to the presence of anthocyanins, which disappear upon maturation. We investigated the hypothesis that light attenuation by anthocyanins may lead to a shade acclimation of the photosynthetic machinery in red leaves.
Yiannis, Manetas, Yiola, Petropoulou, George K, Psaras, Antonia, Drinia   +3 more
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Effects of canopy shade on the lipid composition of soybean leaves

Physiologia Plantarum, 1997
The effect of canopy shade on leaf lipid composition was examined in soybeans (Glycine max cv. Young) grown under field conditions. Expanding leaves were tagged at 50, 58 and 65 days after planting (DAP) in plots with either a high (10 plants m−1 row) or low (1 plant m−1 row) plant density.
Kent O. Burkey, Richard F. Wilson, Randy Wells   +2 more
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Leaf Angle: An Adaptive Feature of Sun and Shade Leaves

Botanical Gazette, 1979
Ten woody deciduous dicot species, ranging from obligate sun plants to facultative sun/shade plants, were grown in full sun and approximately 17% of full sun. Observations of leaf orientation showed that the leaves of most species are slanted, some to nearly vertical, in full sun and are more nearly horizontal in the shade.
openaire   +1 more source