تحمل لوبیاقرمز و لوبیاچشم‌بلبلی به سطوح متفاوت شوری

Salinity, as a most important environmental stresses, limits plants growth and yield, which response of crops may be different. In this study influence of different salinity levels (0, 1.5, 3.0, 4.5 and 6.0 dS m-1) was examined on growth, yield, yield components, sodium and potassium concentration of shoot and root in common bean and cow pea. The results showed that salt stress significantly decreased plant height, dry weight, thousand grain weight and grain yield, as well as, shoot and root potassium concentration and increased shoot and root sodium concentration; however, salt stress at 1.5 dS m-1 had no significant effects in most cases. The amounts of these reductions were closely associated with salinity levels and crops. Reduction in potassium concentration and increase in sodium concentration was greater in common bean than cow pea. On average, shoot sodium in common bean was 1.4 times higher than that in cow pea. Furthermore, potassium in cow pea was 1.3 times higher than that in common bean. Our results indicated that cow pea was considerably more tolerant to salinity; which might be due to higher sodium accumulation in roots and lower translocation to shoots.
Keywords: Potassium, Salinity tolerance, Sodium, Thousand grain weight