Abstract: | Salicylic acid is a phytohormone which stimulates cell proliferation in small amounts and in large quantities it induces cell death phenomena. Salicylic acid is involved in mediating systemic resistance in plants against phytopathogenic agents, viral, bacterial or fungal; it is an important "signal" molecule involved in developmental processes in plants, in plant stress reactions. As growth and development of plants are strongly affected by environmental factors (heavy metals, salinity, water scarcity, cold, UV radiation, etc.), in this study we aimed to test the influence of the treatment with salicylic acid (0,001mM) on the Raphanus sativus L. varieties at different concentrations of sodium chloride (0.65%, 1%, 1.5%, 2% ). The samples of seeds were divided into three groups: control, the group wetted with solutions of sodium chloride and the group treated with solution of salicylic acid and wetted with various concentrations of sodium chloride. After the germination of seeds the following physiological measurements were carried out: germination rate, biometric measurements (root length, hypocotyl length, width cotyledon, fresh medium weight), dry substance and water content, assimilating pigments content. The varieties of radish, Cherry belle (red radish) and Icicle (white radish), showed small to medium resistance to the action of sodium chloride; treatment with salicylic acid did not stimulate seed germination, plantlets growth or assimilating pigment biosynthesis, exhibiting a mild inhibitor of physiological processes in conditions of salinity. |
