biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 46:203-208, 2003 | DOI: 10.1023/B:BIOP.0000022252.70836.fc

High-Temperature Preconditioning and Thermal Shock Imposition Affects Water Relations, Gas Exchange and Root Hydraulic Conductivity in Tomato

D. Morales1, P. Rodríguez1, J. Dell'Amico1, E. Nicolás2, A. Torrecillas2,3, M.J. Sánchez-Blanco2
1 Instituto Nacional de Ciencias Agrícolas, La Habana, Cuba
2 Dpto. Riego y Salinidad, Centro de Edafología y Biología Aplicada del Segura (CSIC), Murcia, Spain
3 Dpto. Producción Agraria, Universidad Politécnica de Cartagena (UPCT), Cartagena (Murcia), Spain

Potted tomato plants (Lycopersicon esculentum Mill. cv. Amalia) were submitted to three different treatments: control (C) plants were maintained at day/night temperature of 25/18 °C; preconditioned plants (PS) were submitted to two consecutive periods of 4 d each, of 30/23 and 35/28 °C before being exposed to a heat stress (40/33 °C lasting 4 d) and non-preconditioned (S) plants were maintained in the same conditions as the C plants and exposed to the heat stress. The inhibition of plant growth was observed only in PS plants. Heat stress decreased chlorophyll content, net photosynthetic rate and stomatal conductance in both PS and S plants. However, PS plants showed good osmotic adjustment, which enabled them to maintain leaf pressure potential higher than in S plants. Furthermore, at the end of the recovery period PS plants had higher pressure potential and stomatal conductance than in S plants.

Keywords: leaf conductance; leaf osmotic potential; leaf water potential; photosynthesis; plant growth
Subjects: gas exchange, root hydraulic conductivity; heat shock, photosynthesis, water relations; hydraulic conductivity, thermal shock; leaf conductance, hydraulic conductivity, thermal shock; leaf osmotic and water potentials, gas exchange; Lycopersicon esculentum; osmotic adjustment; osmotic potential, gas exchange, root hydraulic conductivity; root hydraulic conductivity; stomatal conductance, hydraulic conductivity, thermal shock; temperature, high, gas exchange; thermal shock; tomato, hydraulic conductivity, thermal shock; water potential, leaf

Published: September 1, 2003  Show citation

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Morales, D., Rodríguez, P., Dell'Amico, J., Nicolás, E., Torrecillas, A., & Sánchez-Blanco, M.J. (2003). High-Temperature Preconditioning and Thermal Shock Imposition Affects Water Relations, Gas Exchange and Root Hydraulic Conductivity in Tomato. Biologia plantarum, 46(2), 203-208. doi: 10.1023/B:BIOP.0000022252.70836.fc
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