Photosynthetica 2004, 42(2):291-293 | DOI: 10.1023/B:PHOT.0000040602.20847.c6

Photosynthetic Responses of Tropical Trees to Short-Term Exposure to Ozone

R.M. Moraes1, C.M. Furlan2, P. Bulbovas2, M. Domingos1, S.T. Meirelles2, A. Salatino2, W.B.C. Delitti2, M.J. Sanz3
1 Instituto de Botânica, São Paulo, SP, Brazil, e-mail
2 Universidade de São Paulo, São Paulo, SP, Brazil
3 Fundación Centro de Estudios Ambientales del Mediterráneo, Valencia, Spain

Saplings of the tropical trees Tibouchina pulchra (Cham.) Cogn., Caesalpinia echinata Lam., and Psidium guajava L. cv. Paluma were exposed in open-top chambers with charcoal filtered air and measurements of gas exchange and chlorophyll fluorescence were made before (t1) and after exposure to non-filtered air plus O3 (t2), simulating 6-h peaks of O3 similar to those observed in São Paulo city (SE Brazil, reaching an AOT40 of 641 nmol mol-1). After the fumigation, the net photosynthetic rate, stomatal conductance, transpiration rate, and Fv/Fm were reduced (p<0.05) for the three species. C. echinata was the most sensitive species and P. guajava cv. Paluma the most resistant.

Additional key words: Caesalpinia echinata; chlorophyll fluorescence induction; net photosynthetic rate; photosystem 2; Psidium guajava; stomatal conductance; Tibouchina pulchra; transpiration rate

Published: June 1, 2004  Show citation

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Moraes, R.M., Furlan, C.M., Bulbovas, P., Domingos, M., Meirelles, S.T., Salatino, A., Delitti, W.B.C., & Sanz, M.J. (2004). Photosynthetic Responses of Tropical Trees to Short-Term Exposure to Ozone. Photosynthetica, 42(2), 291-293. doi: 10.1023/B:PHOT.0000040602.20847.c6
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