Abstract

MEJIA DE TAFUR, María Sara; BURBANO DIAZ, Ronal Arturo; GARCIA DIAZ, Mario Augusto  and  BAENA GARCIA, Diosdado. Photosynthetic response of Eucalyptus grandis W. Hill to soil water availability and to the light intensity. Acta Agron. [online]. 2014, vol.63, n.4, pp.311-317. ISSN 0120-2812.  https://doi.org/10.15446/acag.v63n4.43598.

At the Universidad Nacional de Colombia Sede Palmira (950 m, 24 °C and 75% RH) two experiments were established to assess the photosynthetic response of four clones of Eucalyptus grandis to water stress and its response to light intensity. In both cases the experimental design was a split plot with 16 treatments (4 levels of water and 4 clons) and four replications. The main plot corresponded to the water level and the clones were located in the sub - plots. Statistical analysis of the data indicates that the E. grandis reduces its photosynthesis rate in response to soil water stress, which depends also on the clone. This suggests the presence of physiological mechanisms depending on each genotype. Typical light curves with low compensation points were presented (0.9 - 7.0 µmol/m²/s), high photosynthetic rates (68 - 39 µmol CO₂ /m²/s) and high photosynthetic efficiency (0.0003 to 0.0086 mol CO₂ / mol of light)

Keywords : Eucalyptus grandis; photosynthesis; light curves; water stress.

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