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Annals of Botany 86: 1057-1063, 2000
© 2000 Annals of Botany Company

Shoot Dry Weight, Chlorophyll and UV-B-absorbing Compounds as Indicators of a Plant’s Sensitivity to UV-B Radiation

Jennifer L. Smith, David J. Burritt+ and Peter Bannister

Botany Department, University of Otago, P.O. Box 56, Dunedin, New Zealand

Received: 14 March 2000 ; Returned for revision: 18 May 2000 . Accepted: 18 July 2000

When studying the effects of ultraviolet-B (UV-B) radiation on plants, a good measure of UV-B sensitivity is a decrease in dry weight, since this reflects the cumulative effect of many small disruptions in plant function. Measurements of chlorophyll concentration and the level of UV-absorbing compounds are also used to gauge plant health during and after UV-B exposure. When a variety of vegetable crop plants were screened for UV-tolerance, it was found that the levels of chlorophyll and UV-absorbing compounds did not correlate with sensitivity. Biomass accumulation was, however, correlated with UV-sensitivity; plants that accumulated more biomass over a 2-week period were more likely to be UV-B sensitive. This suggests that a rapid growth rate renders plants more sensitive to the injurious effects of UV-B radiation. Copyright 2000 Annals of Botany Company

UV-B radiation, UV-absorbing compounds, chlorophyll, biomass production, UV-B sensitivity, Capsicum frutescens,Cucurbita pepo , Chicorium endivia, Lactuca sativa, Phaseolus vulgaris, Solanum melongena, Spinacia oleracea, Sinapis alba


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