Alkalinity stress, salicylic acid and soil type interactions on growth parameters in Mung bean (Vigna radiate)

Salicylic acid plays a vital role in increasing the resistance of plants to alkalinity stress. In this research, the interaction of alkalinity stress, salicylic acid and soil type on Mung bean growth parameters were investigated. This experiment was conducted as a factorial based on a complete randomized design with three replications in greenhouse of Razi University. Treatments included alkalinity stress (Sodium bicarbonate at three levels 0, 20 and 40 mM), salicylic acid at four levels (0, 250, 500 and 750 μM) and two soil types. The results showed that although alkalinity stress significantly reduced the growth parameters such as plant height, root/shoot ratio, number of active root nodes, leaf area and leaf relative water content and increased proline content of the plant at 1% level, but in contrast, salicylic acid spray mitigated them. Furthermore, there was a significant difference between the two soil types in terms of reducing the effects of stress. In general, the concentration of 500 mM salicylic acid, as an optimum concentration, could neutralize the effects of extreme tension in alkalinity.