GERMINATIVE RESPONSES OF Atriplex crenatifolia, (QUENOPODIACEAE) IN SALINITY CONDITIONS

VILLARREAL V; RODRIGUEZ RIVERA MF; SOSA LR; MORICONI JI; FERNANDEZ EA

Huerta Grande - Cordoba - Argentina

Congreso; 1° Reunión Conjunta de las Sociedades de Biología de la República Argentina; 2007

Sociedad Argentina de Biología

Atriplex crenatifolia is used as he native forage species in dry and saline environments of San Luis Province. The objective of this work is to study the germinative responses of his seeds to  different salinity conditions with Na+ and K+. Harvested seeds in the Salinas del Bebedero, San Luis, which were threshed manually and scarified by 2’30’’ with H2SO4 previously to the test. The seeds were placed in Petri boxes and moistened with 5ml of NaCl; NaSO4; NaCl+NaSO4; KCl; KSO4 and KCl+KSO4 solution, in adequate concentrations to generate osmotic potentials of: 0 (control); -0.4; -0.8; -1.2; -1.5 and -1.9MPa. The test was making in stove of cultureto 26±2ºC. The germinated seed number was recorded and Percentage of germination (PG) and Germination Velocity Index (GVI) was calculated. The NaCl and NaSO4 reduced the PG andthe GVI significantly (36%y 55%; 8.22 and 8.80 respectively) from -0.4MPa; whereas with the combination of both, this parameters does not differ of the control (81%) but until -0.8MPa. The KCl and KSO4 solutions affected the PG and GVI significantly from - 0.8MPa (66% and 63%; 14.67 and 9.47 respectively) and the combination of these reduced the PG and IVG significantly from - 1.2MPa (47% and 11.87.) The Na+ and K+ salts affect of different way the germination of the seeds of A. crenatifolia being more negative the Sodium salt effect.