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Plant Physiology 52:57-62 (1973)
© 1973 American Society of Plant Biologists

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Articles

Optical Parameters of Leaves of 30 Plant Species 1

H. W. Gausman and W. A. Allen

a Southern Region, Soil, Water, and Air Sciences, Agricultural Research Service, United States Department of Agriculture, Weslaco, Texas 78596

Optical parameters (absorption coefficient k, infinite reflectance R{infty}, scattering coefficient 8) are tabulated for seven wavelengths and analyzed for statistical differences for 30 plant species. The wavelengths are: 550 nm (green reflectance peak), 650 nm (chlorophyll absorption band), 850 nm (infrared reflectance plateau), 1450 nm (water absorption band), 1650 nm (reflectance peak following water absorption band at 1450 nm), 1950 nm (water absorption band), and 2200 nm (reflectance peak following water absorption band at 1950 nm).

Thick, complex dorsiventral (bifacial mesophyll) leaves such as rubber plant, begonia, sedum, and privet had lower R{infty} values than thinner, less complex dorsiventral leaves (i.e., soybean, peach, bean, rose) or essentially centric (undifferentiated mesophyll) sorghum and corn leaves. Infinite reflectance was negatively correlated with leaf thickness (–0.734**).

Thick, complex dorsiventral leaves (crinum, oleander, privet, rubber plant, sedum) had higher (p 0.01) k values than thinner, less complex dorsiventral leaves (i.e., soybean, rose, peach) or essentially centric sorghum, sugarcane, and corn leaves. A coefficient of 0.718** was obtained for the correlation of k values with leaf thickness values.

Complex dorsiventral oleander, orange, and crinum leaves had higher (p 0.01) 8 values than less complex dorsiventral (i.e., onion, begonia, banana) or centric leaves (i.e., corn and sugarcane). The scattering coefficient was not correlated with leaf thickness.

1 This study was supported in part by the National Aeronautics and Space Administration under Contract No. R-09-038-002.




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