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Wild populations of Medicago ciliaris and Medicago polymorpha were subjectedto four salt treatments 0, 50, 100 and 150 mM NaCl, plant growth and prolineconcentration in leaves were assessed. The analyzed data revealed significantvariability in salt response within and between the two species, depending onthe salinity level. It was found that high NaCl concentrations affected all thegrowth parameters. However, the reduction was more important at higher NaClconcentrations and the highest reduction was obtained for the populations ofMedicago polymorpha where it reached around 90% in root length at 150 mM NaClfor Pmar. The Tunisian population of Medicago ciliaris, prospected on soilsaffected by salinity, was the best tolerant in all ecotypes studied in thiswork. This population, exhibits a particular adaptability to salt environmentat both germination and seedling stage. Furthermore, the correlation among thestudied plants sensitivity and leaf proline concentration showed that highproline contents were related to their reactivity to salt. Consequently, itappeared that proline biosynthesis occurred presumably as a consequence ofdisturbance in cell homoeostasis and reflected poor performance and greaterdamage in response to salt stress. These findings indicated that this osmolytescontent may be used as another useful criterion to differentiate salt-tolerantfrom salt sensitive plant in annual medics.

Growth and proline content in NaCl stressed plants of annual medic species