Photosynthetic responses of tropical trees to short-term exposure to ozone

Author(s)

Moraes, R. M. ; Furlan, C. M. ; Domingos, M. ; Meirelles, S. T. ; Salatino, A. ; Delitti, W. B.C ; Sanz, M. J. ; Bulbovas, P. ^[8]

• Document type: Journal article
• Source: Photosynthetica; v. 42, n. 2, p. 291-293, jun. 2004.
• Field of knowledge: Biological Sciences - Ecology

Abstract

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. (AU)

• FAPESP's process: 00/06422-4 - Caesalpinia echinata Lam. (Brazil-wood): from seed to wood, a model for studies on tropical Brazilian trees
• Grantee: Rita de Cassia Leone Figueiredo Ribeiro
• Support Opportunities: Research Projects - Thematic Grants