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Memorias de investigación
Research Publications in journals:
Osmotic adjustment is a significant mechanism of drought resistance of Pinus pinaster and Pinus canariensis.
Year:2009
Research Areas
  • Plant physiology
Information
Abstract
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.
International
Si
JCR
Si
Title
SPANISH JOURNAL OF AGRICULTURAL RESEARCH
ISBN
1695-971X
Impact factor JCR
0,388
Impact info
Volume
18
Journal number
2
From page
159
To page
166
Month
AGOSTO
Ranking
Participants
  • Autor: Rosa Ana Lopez Rodriguez (UPM)
  • Autor: Ismael Aranda García (UPM)
  • Autor: Luis Alfonso Gil Sanchez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Genética y Fisiología Forestal
  • Departamento: Silvopascicultura
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