Résumé:
The evaluation of this study is done by measuring some
morpho-physiological and biochemical parameters in order to alleviate the interaction between the Na+ / K + during the germination phase and development of tomato (Lycopersicon esculentum Mill var: Heintz ). For this purpose a factorial experiment was performed on the soil in pots in a completely randomized block design with four concentrations of NaCl (S0: 0, S1 25, S2 50 S3: 150) mmol / L and four concentrations of potassium as KH2PO4 (K0:0, K1:10, K2:20, K3:40) mmol / L with four replications under controlled conditions, the work was done on 64 experimental units. Morphological observation during the germination phase showed that salinity has a depressive effect on the germination percentage (GP) germination capacity (GC), germination rate (GR) and the germination stress index (GSI) .During the seedling development phase salt stress resulted in an increase in stomatal resistance (RS) which reflected on stomatal conductance (SC) these physiological traits are linked to the accumulation of solutes (glucose, proline ) which may be due to the
accumulation of Na+ and reduction of K+ and the selectivity coefficient Na+ / K+ in the leaves and roots that have participated in the reduction of leaf area (SF) fresh weight (PF) the dry weight (PS) the length of the stem (LN) and the rate of chlorophyll pigments (Cha, Chb, ChT) ,by against the index of salinity stress (DMSI) increased and decreased potassium Applying this last eliminated the inhibitory effect of salinity in the different proposed levels during germination stage and seedling development.
