Journal of Food, Agriculture and Environment

Impact of abiotic salt stress on some metabolic activities of Ephedra alata Decne

Author(s):

Abdulaziz A. Alqarawi ¹, Elsayed F. Abd Allah ¹*, Abeer Hashem ², Asma A. Al Huqail ², Abdulaziz A. Al Sahli ²

Recieved Date: 2014-02-23, Accepted Date: 2014-04-14

Abstract:

The present study was undertaken to investigate the impact of NaCl stress on some metabolic processes of a range plant Ephedra alata. E. alata is subjected to different concentrations of salt (0.0, 0.05, 0.1 and 0.2 M). High salt concentrations (0.1 and 0.2 M) caused significant increment of NH₃-N and total soluble-N which were accompanied with significant decrease in protein-N, total-N as well as crude protein. The amino acid analysis revealed the presence of 17 free amino acids in the control plant. Proline, phenylalanine and tryptophan were the most significant amino acids increased against salt stress. The activities of antioxidant enzymes catalase, peroxidase ascorbate peroxidase, and superoxide dismutase were increased with increasing concentration of salt and the maximum increase was observed at 0.2 M NaCl stress. Membrane stability index (MSI) and tissue water content (TWC) were negatively affected with increasing concentration of NaCl; however, lipid peroxidation (MDA) and total phenol content incremented. Exposure of plants to NaCl showed negative impact on growth stimulators such as IAA, IBA, GA₁ and GA₄ in directly proportional. The shoot Na⁺ content increased with increasing salt stress accompanied with significant decreases in K⁺, Mg²⁺ and Ca²⁺.

Keywords:

E. alata, salinity, amino acids, antioxidant enzymes, hormonal balance, elements

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Agriculture
Pages: 620-625

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