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Memorias de investigación
Ponencias en congresos:
Mechanical strength and water relations parameters are correlated in leaves: Two species, two growth habits, two strategies in responding to Mediterranean conditions .
Año:2009
Áreas de investigación
  • Fisiología vegetal
Datos
Descripción
Tensile strength and tensile elasticity were measured jointly with water relations parameters such as pre-dawn and mid-day water potentials, wilting point, osmotic adjustment and modulus of elasticity in leaves of evergreen coast live oak, Quercus agrifolia and deciduous southern California black walnut, Juglans californica. These two trees were dominant on a north-facing slope in southern California where about half of the individuals were burned and resprouted following wildfire in 2008, and half the trees were unburned adults that did not endure the fire effects. The different morphological and physiological traits were measured on leaves at different ontogenetic states from flushing, staring in January 2009, and are being followed seasonally. It was found that as leaves matured there were increases in tensile strength, tensile elasticity and modulus of elasticity. The mechanical strength was observed along with decreases in specific leaf area, predawn and midday water potentials and wilting point. By late spring there were further increases in mechanical strength, tensile elasticity, and elastic modulus, and decreases in field water potentials, wilting point, indicating osmotic and mechanical adjustment, especially in oak. Oak had greater tensile strength, tensile elasticity and osmotic adjustment, and lower specific leaf area and lower field water potentials and wilting points than walnut. For both species, adults had greater leaf mechanical strength, leaf tensile elasticity and greater osmotic adjustment but lower specific leaf area, lower field water potentials and lower wilting points than the resprouts. Thus the strength properties were correlated with various water relations measurements, suggesting a linkage between mechanical and water relations properties of leaves, but also two very different patterns to face Mediterranean conditions by the two studied species.
Internacional
Si
Nombre congreso
Botany & Mycology
Tipo de participación
960
Lugar del congreso
Utah, EEUU
Revisores
Si
ISBN o ISSN
DOI
Fecha inicio congreso
25/07/2009
Fecha fin congreso
29/07/2009
Desde la página
0
Hasta la página
0
Título de las actas
Esta actividad pertenece a memorias de investigación
Participantes
  • Participante: B. Bergman
  • Participante: R. Stanfield
  • Participante: M. Ewers
  • Autor: Ismael Aranda García (UPM)
  • Participante: E. Bobich
  • Participante: F. Ewers
  • Participante: I. Kleinsasser
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