Abstract
In this study, the effects of NaCl and CaCl 2 on growth and nutrients uptake of cowpea (Vigna unguiculata L. Walp cvs. Mouola GG; Mouola PG, Garoua GG, Garoua PG and Tsacre) were investigated. Three treatments [0 (unsprayed), 50 mM NaCl or 50 mM CaCl 2 ] were adopted, with five replications. NaCl and CaCl 2 were applied as foliar spray twice a week during 30 days after sowing. Application of NaCl resulted in significant decreases in plant height, dry weights of root and shoot of Garoua GG, Mouola PG and Tsacre compared to Garoua PG and Mouola GG cultivars, while those growth parameters were significantly reduced under CaCl 2 treatment in all cowpea cultivars except Mouola PG. K + , Ca 2+ and Mg 2+ contents decreased under NaCl stress in leaves of Garoua PG and Mouola GG, but no significant changes were observed in those of Garoua GG, Mouola PG and Tsacre. The main strategy of salt tolerance in Mouola GG and Garoua PG seems to be as a result of increased osmotic adjustment through the accumulation of Na + in leaves while in salt sensitive Mouola PG, Garoua GG and Tsacre, the osmotic adjustment may be due to the accumulation of inorganic ions (K + , Ca 2+ and Mg 2+ ) in leaves, contributing to the maintenance of water uptake and cell turgor, allowing for physiological processes. In the analysis of growth parameters measured, the results suggested that Mouola GG and Garoua PG cultivars were relatively more tolerant to salinity than others, suggesting that those cultivars could be cultivated in the environment with varying salinity. CaCl 2 treatment significantly increased growth parameters and nutrients uptake specially Ca 2+ in Mouola PG cultivar, suggesting that it could grow and develop on calcareous soils. Keyword: Foliar spray, growth, nutrients uptake, saline and calcareous soils, Vigna unguiculata. African Journal of Biotechnology , Vol 13(47) 4382-4389
Highlights
Changes in growth g h and nutrien n nt upta ake in rrespon nse to cation of sod dium and calcium c chlorid de in foliar applic owpea cultiva ars
Effect of foliar application of NaCl and CaCl2 on dry weights of cowpea organs. The growth parameters such as shoot and root dry weights were measured after spraying exogenous substances (NaCl or CaCl2) on leaves of cowpea cultivars (Figure 1A and B)
NaCl treatment significantly inhibited the shoot dry weights of Garoua GG, Mouola PG and Tsacre cultivars while there were no significant differences in those of Garoua PG and Mouola GG, as compared with the control groups (Figure 1A)
Summary
Changes in growth g h and nutrien n nt upta ake in rrespon nse to cation of sod dium and calcium c chlorid de in foliar applic owpea cultiva ars L. Walp p) co Victor Desire Taffou uo1*, Serge e Ekwel So ondi, Lilian ne Tekam Meguekam m2, Alphonse Ervé. Departmentt of Plant Biology and Phys siology, Faculty of Science e, University o of Yaoundé I, PO Box 812 YaoundéCameroon
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