High-Temperature Preconditioning and Thermal Shock Imposition Affects Water Relations,Gas Exchange and Root Hydraulic Conductivity in Tomato |
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Authors: | D Morales P Rodríguez J Dell'Amico E Nicolás A Torrecillas MJ Sánchez-Blanco |
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Institution: | (1) Instituto Nacional de Ciencias Agrícolas, Gaveta Postal 1, 32700, San José de Las Lajas, La Habana, Cuba;(2) Dpto. Riego y Salinidad, Centro de Edafología y Biología Aplicada del Segura (CSIC), P.O. Box 4195, E-30080 Murcia, Spain;(3) Dpto. Producción Agraria, Universidad Politécnica de Cartagena (UPCT), Paseo Alfonso XIII, s/n, E-30203 Cartagena (Murcia), Spain |
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Abstract: | 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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | leaf conductance leaf osmotic potential leaf water potential photosynthesis plant growth |
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