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Descripción
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| Mechanisms of drought resistance were studied in two xeric populations of Pinus canariensis and Pinus pinaster. Seedlings were grown in a hydroponic culture for four months. Gradual controlled drought was imposed during two weeks by adding Polyethylene glycol (PEG-6000) to the growing medium. Two levels of water deficit (Psi = -1MPa, Psi = -2 MPa) and a control treatment (Psi = -0.03 MPa) were tested. Relative water content (RWC) was markedly low at the end of the experiment. Both populations showed a high capacity for osmotic adjustment in needles as shown by the osmotic index, 0.63 (1.33 MPa at 80% RWC) for P. canariensis and 0.54 (1.25 MPa at 80% RWC) for P. pinaster. Root growth and root:shoot (stem + needles) ratio were increased by water deficit. Opposite patterns of relative biomass allocation were assessed between stressed and control plants. While stressed seedlings assigned more dry matter to roots, non-stressed plants showed a higher relative needle weight. The growing media caused additional stress to the plants, thus comparisons with other drought protocols should be made carefully. | |
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Internacional
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JCR del ISI
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Título de la revista
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SPANISH JOURNAL OF AGRICULTURAL RESEARCH |
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ISSN
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1695-971X |
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Factor de impacto JCR
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0,388 |
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Información de impacto
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Volumen
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18 |
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DOI
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Número de revista
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2 |
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Desde la página
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159 |
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Hasta la página
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166 |
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Mes
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AGOSTO |
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Ranking
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