INVESTIGADORES
MAESTRI Damian Modesto
congresos y reuniones científicas
Título:
Drought stress during the dry winter ? spring season affects leaf-level biochemical and physiological parameters in olive trees
Autor/es:
PIERLUIGI PIERANTOZZI; MARIELA TORRES; ROMINA BODOIRA; DAMIĆN MAESTRI
Lugar:
San Juan
Reunión:
Simposio; VIIth International Symposium on Olive Growing; 2012
Resumen:
The aim of the work was to study the
changes in some biochemical and physiological parameters in leaves from two
olive varieties (Arbequina and Manzanilla) grown under different drought stress
levels, applied during the dry winter ? spring season, in the olive cultivation
area from central Argentina. Increasing levels of water deficit affected plant
water relations as measured by pronounced drops of stem water potentials (near -4.0 MPa) in
treatments with severe water deprivation. Deficit irrigation was associated with some
leaf-level biochemical-physiological responses (accumulation of osmotically
active substances, increased concentration of high molecular weight
hydrocarbons and cuticle thickening), which can be interpreted as adaptation
mechanisms of olive to water deficit. Water stress was also associated with
increased malondialdehyde concentration, which is an indicator of membrane
lipid peroxidation, and decreased levels of photosynthetic pigments. These
responses followed a reversible pattern: the values from the mentioned
parameters returned to baseline values after water deprivation suppression and
rewatering. Water deficit affected both photosynthesis and leaf conductance in
a similar way, suggesting that CO2 stomatal diffusion was the main
factor affecting the photosynthetic rate. The results obtained may be useful for the evaluation of
deficit irrigation strategies in semiarid environments with dry winter - spring
period.