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Phenotypic and genetic sources of variability of cavitation resistance in Pinus canariensis

Authors
Publisher
E.T.S.I. Montes (UPM)
Publication Date
Keywords
  • Silvicultura
Disciplines
  • Biology
  • Ecology
  • Geography

Abstract

Pinus nigra Pinus pinaster Pinus brutia halepensislaricio pinus laricio Pinus halepensis Pinus pinea Pinus nigraPinus pinasterlaricio Pinus nigraPinus pinasterlaricio Pinus halepensisPinus pinea Pinus nigraPinus brutia medpine 4th International Conference on Mediterranean Pines 4 170 P6-09 Phenotypic and genetic sources of variability of cavitation resistance in Pinus canariensis Rosana LÓPEZ1, Hervé COCHARD2, Eric BADEL2 and Luis GIL1 1UD. Anatomía, Fisiología y Genética Vegetal. ETSI Montes. Universidad Politécnica de Madrid. Ciudad Universitaria. 28040. Madrid, [email protected], [email protected] 2Université Blaise Pascal, UMR 547 PIAF, avenue des Landais, F-63177 Aubière, France et INRA, UMR 547 PIAF, F-63100 Clermont-Ferrand, France, [email protected], [email protected] In Mediterranean ecosystems, water shortage is the main factor constraining survival and growth of plants. Xylem hydraulic properties are a key factor for the general function of plants as they exert a strong influence on water transport and therefore on the potential for carbon uptake. Resistance to cavitation has been considered a major character involved in drought tolerance. However, variation in cavitation vulnerability could be accompanied by a trade-off with other water transport and physiological traits. We investigated stem xylem vulnerability to cavitation in Pinus canariensis, the only endemic pine of the Canary Islands (Spain). We used the ‘Cavitron’ technique (Cochard 2002; Cochard et al. 2005) to construct xylem vulnerability curves. To assess genetic and environmental effects on vulnerability to cavitation, the xylem water pressure causing 50% loss of hydraulic conductivity (P50) was measured in plants from eight contrasted ecological regions covering, the whole ecological range of the species, at a dry site (approx. 300 mm per year) and a wetter site (800 mm per year). Relationships with other plant traits (survival, ontogeny, growth) and with some

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