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American Journal of Plant Physiology
Year: 2017  |  Volume: 12  |  Issue: 1  |  Page No.: 28 - 37

Response of Pea Plants to Natural Bio-stimulants Under Soil Salinity Stress

El-Sayed Mohamed Desoky, Abdel-Rahman Mohamed Merwad and Ahmed Salah Elrys    

Abstract: Background and Objective: Salinity is one of the most important abiotic stresses causing a significant reduction of crop plants yield. Most arable lands were considered unsuitable for farming due to salinity. To ameliorative the adverse effect of salinity in pea (Pisum sativum L.), the present study investigated the effect of integrated application of some natural bio-stimulants used as foliar spray and/or seed soaking on growth, yield and endogenous physio-chemical constituents of pea growing under soil salinity stress. Materials and Methods: A randomized complete block , factorial (2-factor) experiment was conducted on pea (Pisum sativum L.) grown on saline soil (EC = 6.11-6.17 dS m–1) to assess Ascorbic Acid (AA) and Moringa oleifera Leaf Extract (MLE), used as foliar spray or seed soaking. Data were analyzed by a simple one way variance analysis (ANOVA). Results: The MLE or AA application, used as foliar spray or seed soaking, improved growth characteristics (i.e., shoot length, number of branches per plant and canopy dry weight) and physio-chemical attributes (i.e., RWC and MSI%, concentrations of chlorophylls a, b, carotenoids, total soluble sugars, free proline, contents of N, P, K and Ca) in pea plants. In addition, number of pods, pod weight and green pod yield were improved when compared with the controls (tap water foliar spray or seed soaking). Combined treatments of AA and MLE (i.e., seed soaking in AA+foliar spray with AA, seed soaking in AA+foliar spray with MLE, seed soaking in MLE+foliar spray with AA and seed soaking in MLE+foliar spray with MLE) significantly increased all above mentioned parameters compared to the control (seed soaking in tap water+foliar spray with tap water). Conclusion: The combined seed soaking in MLE+foliar spray with MLE treatment was found to be highly effective at improving the growth and yields of bean plants by alleviating the inhibitory effects of soil salinity stress.

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