Morphological and ecophysiological variation of the hybrid oak Quercus subpyrenaica (Q. faginea × Q. pubescens)

摘要: Natural hybridization is common among oaks. We studied the variability of morphological and ecophysiological variables in hybrid Quercus subpyrenaica its assumed parental species Q. faginea pubescens, which co-occur NE Spain. To assess fitness these taxa we several (hydraulic conductivity, Kh; hydraulic specific Ks; leaf LSC; water potential corresponding to a 50% loss PLC50; efficiency light absorption, Ea). performed correspondence analysis (CA) ordinate seedlings, grown under homogeneous environmental conditions, according their plant morphology. The CA axis 1 synthesized intra-taxon variability, while 2 summarized inter-taxa variability. showed wide spectrum forms, but they were overall closer those faginea. defined three phenotypes within based on morphology, were: (i) robur group (Qs-r; auriculate base, rounded lobe apex); (ii) pubescens (Qs-p; acute (iii) (Qs-f; acute-spiny apex). mean values Ks PLC50 arranged groups same order as ordination Qs-r highest PLC50, Qs-f lowest. Both morphologically ecophysiologically, hybrids range values, spanned even exceeded variation taxa.