SciELO - Scientific Electronic Library Online

 
vol.38 número1Fórmula para la valoración monetaria del árbol urbano en Chile centralCaracterísticas, obstáculos y efectos de la innovación en empresas del sector maderero de la región del Maule, Chile índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

  • En proceso de indezaciónCitado por Google
  • No hay articulos similaresSimilares en SciELO
  • En proceso de indezaciónSimilares en Google

Compartir


Bosque (Valdivia)

versión On-line ISSN 0717-9200

Resumen

SILVA, María et al. Gas-exchange response and survival of young Eucalyptus spp commercial genotypes under water stress. Bosque (Valdivia) [online]. 2017, vol.38, n.1, pp.79-87. ISSN 0717-9200.  http://dx.doi.org/10.4067/S0717-92002017000100009.

In the last decades, breeding programs for Eucalyptus species in Chile have mainly focused on increasing productivity and adaptation. However, little is known about how droughts and climate change may influence physiological responses that determine tree growth. Evaluating leaf-level physiology may be important to predict survival of eucalyptus genotypes under severe water stress. This study assessed net photosynthesis (AN), stomatal conductance (gs), transpiration (E) and instantaneous water use efficiency (WUE) in Eucalyptus globulus, E. nitens, E. badjensis, E. smithii and E. globulus x E. nitens and E. camaldulensis x E. globulus hybrids genotypes under increasing water stress conditions. Survival of each genotype was related to the observed physiological responses at -0.03 MPa, -1.5 MPa and -2.5 MPa soil water potentials. Higher plant survival was observed on genotypes with reduced water loss due to stomatal adjustment under water deficit, and on genotypes that could maintain initial photosynthetic rates under increased water deficit despite reductions in stomatal conductance. A negative relationship between plant survival and gas-exchange parameters suggests that photosynthesis rate, under high water availability (-0.03 MPa) and moderate water deficit (-1.5 MPa), may be a useful indicator for early selection of genotypes at sites under water limitations.

Palabras clave : water stress; carbon assimilation; water use; clones; hybrids.

        · resumen en Español     · texto en Español     · Español ( pdf )

 

Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons