Selection de l’orge (Hordeum vulgare L.) pour la tolerance aux stress abiotiques

Abstract

The effects of salt stress on some morphological and physiological characteristics were studied on three different cultivars of barley (Hordeum vulgare L.): Tichedrett, Fouara and Saïda. After 7 days of culture on MS medium, seedlings of the three cultivars were regenerated and then subjected to salt stress at the following concentrations of 0, 100, 200 mM NaCl for 15 days. The results show that salt stress affects all parameters measured both physiological and morphological. The number of roots, root length, fresh weight of shoot and root parts, the contents of potassium, chlorophyll and the ratio K+ / Na + decreases, while the sodium content and proline increased. Among the genotypes evaluated, Tichedrett and Saïda are more resilient against salt stress than the newly released variety Fouara. This tolerance appears to be associated with an ability to accumulate more fresh matter under stress while minimizing the accumulation of sodium and promoting that of potassium.