J. Phys. IV France 125 (2005) 817-819
DOI: 10.1051/jp4:2005125188

Monitoring ethylene and oxygen emission during water stress of Populus alba leaves

D. Acosta-Avalos¹, J.J. Alvarado-Gil² and H. Vargas<sup>3

1</sup>  Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraíba, Av. Shishima Hifumi 2911, CEP 12244-000, São José dos Campos, SP, Brazil
²  Departamento de Física Aplicada, CINVESTAV-Unidad Mérida, Apdo. Postal 73, Cordemex, Mérida, Yucatán 97310, Mexico
³  Laboratório de Ciências Físicas, Centro de Ciência e Tecnologia, Universidade Estadual do Norte Fluminense, Av. Alberto Lamego 2000, CEP 28015-620, Campos dos Goytacazes, RJ, Brazil

Abstract
Photoacoustic techniques were used to analyze the emission of ethylene and photosynthetic oxygen, as function of time, in water stressed leaves of poplar (Populus alba). Oxygen evolution was measured using the OPC technique, with an electret microphone as the photoacoustic cell. Ethylene emission was measured using an intracavity photoacoustic cell inside a CO₂ laser. The results obtained could be used in studies of stomatal closure dynamics or photosynthetic activity.

© EDP Sciences 2005