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

Authors

  • Ademir Kleber Morbeck de Oliveira Universidade Anhanguera-Uniderp
  • Sônia Cristina Juliano Gualtieri Universidade Federal de São Carlos

DOI:

https://doi.org/10.14393/BJ-v33n2-32820

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

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Published

2017-03-30

How to Cite

MORBECK DE OLIVEIRA, A.K. and GUALTIERI, S.C.J., 2017. Gas exchange in young plants of the species Tabebuia aurea exposed to conditions of induced water stress . Bioscience Journal [online], vol. 33, no. 2. [Accessed1 December 2022]. DOI 10.14393/BJ-v33n2-32820. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/32820.

Issue

Section

Biological Sciences