Vol. 5, Issue 3 (2020)
Na+ exclusion and na+/ k+ ratio adjustment by mycorrhiza enhances macro/micro nutrients uptake in two members of Cucurbitaceae family under salt stress
Author(s): Okon Okon, Abdulnabi Matrood, Joseph Okon
Abstract: This research investigated the influence of inoculating Telfairia occidentalis and Cucurbita maxima with arbuscular mycorrhizas (Rhizophagus irregularis and Glomus geosporum) with poultry manure in Na+/K+ ratio adjustment and plant mineral nutrition. Saline soil used had an electrical conductivity (EC) of 6.70 dS/m, while the garden soil had an EC of 0.29 dS/m. Mineral analysis of C. maxima and T. occidentalis leaves revealed increased uptake and accumulation of Na+, Cl-, Zn and a high Na+/K+ ratio, while N, P, K, Mg, Ca, Fe and Mn were significantly (p=0.05) reduced in saline soil treatments. Inoculation with mycorrhiza alone or together with PM increased the minerals in the two test plants both in saline and non-saline treatments. The mycorrhizas aided the maintenance of favorable K+/Na+ ratio equivocating the disruption of K+ homeostasis. The capacity of plants to maintain a high cytosolic K+/Na+ ratio is one of the key determinants of plant salt tolerance.