Abstract
The effects of salt stress on the level of osmolyte accumulation in two different cultivars (K-134 and JL-24) of groundnut seedlings were studied. Seeds were grown at different concentrations of NaCl stress: 50, 100 and 150 mM and their respective controls (0.0% NaCl) for nine days. Salt stress resulted in a significant modification in the level of osmolyte accumulation in the two cultivars of groundnut. The accumulation level of osmolytes such as proline, glycine betaine, soluble sugars, free amino acids and polyamines were increased significantly in both cultivars with increasing stress severity and duration when compared with their controls. However, the percent increase of osmolyte accumulation was higher in cv. K-134 and lower in cv. JL-24. The present study indicated that cv. K-134 is salt tolerant than cv. JL-24 based on osmolyte accumulation and growth parameters. The osmolyte accumulation in relation to the salt tolerance of these cultivars was discussed. Key words: Osmolytes, salt tolerance, groundnut, cultivar.
Highlights
Soil salinity is one of the most significant agricultural problems in arid and semi-arid regions in different parts of the world
A number of investigators (Xiong and Zhu, 2002; Rahnama and Ebrahimzadeh, 2004) have reported that the osmotic adjustment in plants subjected to salt stress occurs by the accumulation of high concentrations of osmotically active compounds known as osmolytes such as proline, glycine betaine, soluble sugars, free amino acids, polyamines, etc, in order to lower the osmotic potential
The present study was aimed to make comparative analysis of tolerance potentials based on osmolyte accumulation in two different groundnut cultivars differing in salt tolerance
Summary
Soil salinity is one of the most significant agricultural problems in arid and semi-arid regions in different parts of the world. Glycine betaine is one of the quaternary ammonium compounds and is regarded as an effective compatible solute that accumulates in the chloroplasts of certain plants when exposed to environmental stresses, such as drought and salinity. It could play a major role in maintaining intracellular osmotic equilibrium during stress conditions (Subbarao et al, 2001; Giridarakumar et al, 2003). The present study was aimed to make comparative analysis of tolerance potentials based on osmolyte accumulation in two different groundnut cultivars differing in salt tolerance These lines are used in improving programmes; it seems to be effective and economic improvement
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