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Publication Type J
Authors Parida, A. K. and B. Jha
Title Physiological and Biochemical Responses Reveal the Drought Tolerance Efficacy of the Halophyte Salicornia brachiata
Source Journal of Plant Growth Regulation
Author Keywords Compatible solutes Drought stress Hydroponic culture Salicornia brachiata Polyethylene glycol Polyphenol water-stress salt stress differential responses osmolyte accumulation proline accumulation lipid-peroxidation cotton genotypes wheat cultivars plants salinity
Abstract The drought tolerance of Salicornia brachiata seedlings was assessed by monitoring growth, nutrient uptake, electrolyte leakage, lipid peroxidation, and biochemical responses under drought conditions simulated with 0, 10, 20, and 30 % polyethylene glycol (PEG 6000). After 7 days of drought induction, plants were harvested for measurement of various parameters. The biomass decreased and the plant height remained unchanged with PEG treatment. The total plant water content (TWC%) decreased by 11 % at the highest concentration of PEG (30 %). The electrolyte leakage and lipid peroxidation of shoots increased by 17 and 5 %, respectively, in 30 % PEG-treated plants. K+ and Ca2+ contents of shoots increased in a dose-dependent manner. However, in roots K+ content decreased and Ca2+ content remained unaffected by PEG treatment. Mg2+ content increased at high concentrations of PEG (20-30 %) in shoots and decreased at the highest concentration of PEG (30 %) in roots. Total free amino acids, proline, and polyphenol contents increased progressively with increase in severity of the drought stress. Total sugar content and reducing sugar content increased in 10 and 20 % PEG-treated plants and decreased in 30 % PEG-treated plants. Our results suggest that proline and other free amino acids, sugars, and polyphenols are the main compatible solutes in S. brachiata for maintenance of osmotic balance, protection of cellular macromolecules, detoxification of the cells, and scavenging of free radicals under drought stress. A greater accumulation of compatible solutes also facilitates the maintenance of nutrient uptake and adequate tissue water status and protection of membranes under drought conditions in S. brachiata. The results from the present study suggest that S. brachiata can be used for restoration of arid and semiarid lands of coastal ecosystems.
Author Address CSIR, CSMCRI, Discipline Marine Biotechnol & Ecol, Bhavnagar 364002, Gujarat, India. Parida, AK (reprint author), CSIR, CSMCRI, Discipline Marine Biotechnol & Ecol, Gijubhai Badheka Marg, Bhavnagar 364002, Gujarat, India. asishparida@csmcri.org
ISSN 0721-7595
ISBN 0721-7595
29-Character Source Abbreviation J. Plant Growth Regul.
Publication Date Jun
Year Published 2013
Volume 32
Issue 2
Beginning Page 342-352
Digital Object Identifier (DOI) 10.1007/s00344-012-9303-7
Unique Article Identifier WOS:000319165500011
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