TITLE	Correlation between ozone resistance and relative chlorophyll fluorescence or relative stomatal conductance of bedding plants
AUTHOR	Yu-Sen Chang Department of Horticulture, National Taiwan University, No. 1, Section 4. Roosevelt Road, Taipei 10617, Taiwan, Republic of China M.R. Yu Department of Horticulture, National Taiwan University, No. 1, Section 4. Roosevelt Road, Taipei 10617, Taiwan, Republic of China
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ABSTRACT	Eight species of bedding plants were exposed to 400 ppb ozone (O3) for 4 h. On the basis of the resulting foliar injury, Madagascar periwinkle (Catharanthus roseus) and impatiens (Impatiens walleriana) were the most resistant to O3, and wax begonia (Begonia x semperflorens-cultorum) was the most sensitive to O3. Clorophyll fluorescence (Fv/Fm) and stomatal conductance were measured before and after the O3 fumigation. There was a significant regression between, the degree of foliage injury by O3 and relative chlorophyll fluorescence (RCF, ratio of post-fumigation Fv/Fm: pre-fumigation Fv/Fm) or relative stomatal conductance (RSC, ratio of post-fumigation stomatal conductance: pre-fumigation stomatal conductance) (r = - 0.84, P<0.001 and r=0.64, P<0.05 respectively). That is, species of tested bedding plants that had stronger O3 resistance generally had higher RCF and lower RSC values. It is suggested that RCF and RSC measurements could serve as indicators to screen plants for O3 resistance.
KEYWORD	Air pollution; Bedding plants; Chlorophyll fluorescence; Ozone resistance; Stomatal conductance;
ARTICLE INFO	Botanical Bulletin of Academia Sinica, Volume 42 Number 4 October 2001, page 265-272, 8 pages
PUBLISHER	Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China