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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2010, 31 (5)                                     Back


abstract_01

Effect of cyanobacterial exopolysaccharides on salt

stress alleviation and seed germination

 

Monu Arora, A. Kaushik*, Nisha Rani and C.P. Kaushik

 

Department of Environmental Science and Engineering, Guru Jambheshwar

University of Science and Technology, Hisar - 125 001, India

(Received: September 22, 2009; Revised received: January 15, 2010; Accepted: January 30, 2010 )

 

Abstract: Effect of exopolysaccharides (EPS) produced by a consortium of cyanobacteria on germination of three crops wheat, maize and rice was studied at different salt concentrations. Production of EPS was found to be stimulated by salts, which in turn had a significant Na+ removal capability from aqueous solution. Seed germination, vigor index and mobilization efficiency in all the three crops remarkably improved when cyanobacterial EPS was applied. While germination improved significantly by 13 to 30%, mobilization efficiency increased marginally by 1.03 to 1.1 times and vigor index increased by 1.15 to 2.4 times in these crops in response to EPS under non-saline conditions. Salinity had an inhibitory effect on seed germination of all the species showing 18 to 54% reduction. However, in the presence of EPS, the salt induced inhibition diminished to 13 to 18%. Inhibitory effect?? of salt on chlorophyll concentration, vigor index and mobilization efficiency of the seedlings was much less in these crops in the presence of EPS, indicating the latter?s role in salt stress alleviation.

Key words: Consortium, Exopolysaccharides, Mobilization efficiency, Vigor index

??????? PDF of full length paper is available online

 

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