Gas exchange in young plants of the species Tabebuia aurea exposed to conditions of induced water stress

  • Ademir Kleber Morbeck de Oliveira Universidade Anhanguera-Uniderp
  • Sônia Cristina Juliano Gualtieri Universidade Federal de São Carlos
Keywords: Hydric Deficit, Photosynthesis, Stomatal Conductance, Paratudo

Abstract

The paratudo, Tabebuia aurea, is a common Brazilian tree from the Pantanal wetland from Miranda, Mato Grosso do Sul, an area with hydric seasonality. To evaluate the effects of water stress on CO2 exchange, ten-month-old T. aurea seedlings cultivated in planting bags were subjected to water stress by suppressing irrigation for 23 days. Stomatal conductance, transpiration rate, and photosynthetic rate were measured during the stress and recovery period, totaling 28 days, using an infrared portable analyzer. After 23 days without irrigation, the transpiration, stomatal conductance, and net photosynthesis rates in leaflets were zero, while the leaflets water potential reached -2.6 MPa. After this point, daily irrigation was resumed, and the values of the measured variables recovered to the initial levels after 96 hours (transpiration rate from 2.0 to 2.6 mmol m-2 s-1; stomatal conductance rate from 0.12 to 0.18 mol m-2 s-1 and photosynthesis rate from 8.1 to 9.5 µmol m-2 s-1). Furthermore, the hydric potential values were similar to those observed at the beginning of the experiment (-0.5 MPa). The results showed that T. aurea has tolerance to drought, allowing their survival in areas subjected to periodic water stress.

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Author Biographies

Ademir Kleber Morbeck de Oliveira, Universidade Anhanguera-Uniderp
Programa de Pós-Graduação em Meio Ambiente e Desenvolvimento Regional - Universidade Anhanguera-Uniderp
Sônia Cristina Juliano Gualtieri, Universidade Federal de São Carlos
Programa de Pós-Graduação em Ecologia e Recursos Naturais - Universidade Federal de São Carlos
Published
2017-03-30
How to Cite
Morbeck de Oliveira, A. K., & Gualtieri, S. C. J. (2017). Gas exchange in young plants of the species Tabebuia aurea exposed to conditions of induced water stress . Bioscience Journal, 33(2). https://doi.org/10.14393/BJ-v33n2-32820
Section
Biological Sciences