INVESTIGADORES
RODRIGUEZ andres Alberto
artículos
Título:
Physiological causes for decreased productivity under high salinity in Boma, a tetraploide Chloris gayana cultivar
Autor/es:
MARCOS DE LUCA; L. GARC√ćA SEFFINO; KARINA GRUNBERG; M. SALGADO; ALICIA CORDOBA; CELINA LUNA; LEANDRO ORTEGA; ANDRES RODRIGUEZ; A. CASTAGNARO; EDITH TALEISNIK
Revista:
Crop and Pasture Science (continuing Australian Journal of Agricultural Research)
Editorial:
CSIRO
Referencias:
Año: 2001 vol. 52 p. 903 - 903
ISSN:
1836-0947
Resumen:
Rhodes grass (Chloris gayana Kunth) is widely cultivated in the semi-arid tropics and favoured for salt tolerance; nevertheless, productivity decreases significantly under saline conditions, especially in tetraploid cultivars. The purpose of this work was to explore, in the tetraploid cultivar Boma, the physiological causes for such decrease. Experiments were carried out in vegetative plants in the greenhouse. At high salinity (200 mM NaCl), an early reduction in leaf area expansion was observed, and, later, decreased dry matter accumulation, suggesting that the central effect of salinity was a limitation of leaf growth. This was evaluated in 2 closely related Boma clones, exhibiting different degrees of salt tolerance. Growth, ion accumulation and excretion, sugars, and proline concentrations were measured under a range of salt concentrations (0?200 mM NaCl). Differences between the clones in leaf expansion were expressed only at high salinity, but were not associated with differences in water potential or hydraulic conductance in the expanding region. At all salinity levels, the proportion of dry leaves was higher in the clone which also had lower salt gland density and Na excretion rates. Less efficient Na extrusion, associated with high oxidative stress, may be the main cause for leaf senescence and differences in productivity between these clones.