February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 6, NUMBER 2, FEBRUARY 1993
IMPACTS OF UV-B: PLANTS
"Ultraviolet-B Radiation Effects on Growth and Physiology of Four
Rice Cultivars," Q.J. Dai (Intl. Rice Res. Inst., POB 933, Manila 1099,
Philippines), V.P. Coronel et al., Crop Sci., 32(5), 1269-1274,
In addition to examining effects on the four cultivars, this study evaluated
morphological and physiological parameters as indicators of genotype sensitivity
in future screenings. Differential varietal responses were found in shoot dry
weight, leaf area, specific leaf weight, net assimilation rate and relative
growth rate, as well as in most physiological and biochemical parameters
"Action Spectrum for DNA Damage in Alfalfa Lowers Predicted Impact
of Ozone Depletion,".
"Optical Properties of the Epidermis of Leek (Allium
ampeloprasum L.) and Cabbage (Brassica oleracea L.) after Enhanced
Ultraviolet-B Radiation," J.S. Gislefoss (Kvithamar Res. Sta., N-7500
Stjordal, Norway), B. Kjeldstad, A.K. Bakken, Acta Agric. Scandinavica
Section B--Soil & Plant Sci., 42(3), 173-176, Sep. 1992.
Exposure during the growth period increased extractable UV-absorbing
pigments in the epidermis of leek, but not cabbage. The pigments produced were
most likely flavonoids.
"Physiological Sensitivity of Plants along an Elevational Gradient
to UV-B Radiation," L.H. Ziska (Dept. Bot., Univ. Maryland, College Pk. MD
20742), A.H. Teramura, J.H. Sullivan, Amer. J. Bot., 79(8),
863-871, Aug. 1992.
Seeds from four plant pairs collected from contrasting elevations in Hawaii
were grown in greenhouses under enhanced UV-B. Results suggest that plants
growing in a naturally high UV-B environment may have mechanisms related to
reproductive phenology and carbon uptake which maintain productivity under those
conditions, and that changes in natural plant populations are possible under
continued ozone depletion.
"Variation in UV-B Sensitivity in Plants from a 3,000-m Elevational
Gradient in Hawaii," J.H. Sullivan (addr. immed. above), A.H. Teramura,
L.H. Ziska, ibid., 79(7), 737-743, July 1992.
Seedlings grown for 12 weeks under varying UV-B levels showed lower
sensitivity for the seeds collected at higher elevations. Of 33 species, UV-B
biomass was reduced in eight and increased in four. Results show that the
sensitivity of natural plant populations varies widely and depends on the
ambient UV-B environment.
"Furanocoumarin Content and Phototoxicity of Rough Lemon (Citrus
jambhiri) Foliage Exposed to Enhanced Ultraviolet-B (UVB) Radiation,"
E.S. McCloud (Dept. Entomol., Univ. Illinois, Urbana IL 61801), M.R. Berenbaum,
R.W. Tuveson, J. Chem. Ecol., 18(7), 1125-1137, July 1992.
Bacterial phototoxicity and furanocoumarin content were determined in
extracts made from cuttings grown under enhanced UV for 95 days. UV-B treatment
did not alter the overall level of furanocoumarins, but did increase the ratio
of psoralen to bergapten. Bacterial photoxicity paralleled the distribution of
"CO2 Enhancement of Growth and Photosynthesis in Rice (Oryza
sativa)--Modification by Increased Ultraviolet-B Radiation," (see
Impacts of CO2 section).
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