Inductive responses of some organic metabolites for osmotic homeostasis in peanut (Arachis hypogaea L.) seedlings during salt stress
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Date
2014-02-06
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Abstract
The salt tolerance of peanut (Arachis hypogaea
L.) seedlings was evaluated by analyzing growth, nutrient
uptake, electrolyte leakage, lipid peroxidation and alterations
in levels of some organic metabolites under NaCl
stress. The plant height, leaf area and plant biomass
decreased significantly in salt-treated seedlings as compared
with control. The relative water content (RWC %) of
leaf decreased by 16 % at high concentrations of NaCl.
There was an increase in the lipid peroxidation level and
decrease in the electrolyte leakage at high concentrations of
NaCl. The total free amino acid and proline contents of leaf
increased by 5.5- and 43-folds, respectively in 150 mM
NaCl-treated plants as compared with control. Total sugar
and starch content increased significantly at high concentrations
of NaCl. Chl a, Chl b, total chlorophyll and
carotenoid contents decreased significantly at high salinity.
Na? contents of leaf, stem and root increased in dosedependent
manner. K? content remained unaffected in leaf
and root and decreased in stem by salinity. The results from
present study reveal that the peanut plants have an efficient
adaptive mechanism to tolerate high salinity by maintaining
adequate leaf water status associated with growth
restriction. In order to circumvent the stress resulting from
high salinity, the levels of some organic metabolites such
as total free amino acids, proline, total sugars and starch
were elevated. The elevated levels of the organic metabolites
may possibly have some role in maintenance of
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Keywords
organic, metabolites