Abstract
Different types of phytohormones are being extensively used to alleviate the adverse effect of salinity stress on plant growth. Among those, Abscisic acid (ABA) is a plant stress hormone and one of the most important signaling molecules in plants. Drought and salinity activate De-novo abscisic acid synthesis prevent further water loss by evaporation through stomata, mediated by changes in the guard cell turgor pressure. Under osmotic stress abscisic acid induce the accumulation of protein involved in the biosynthesis of osmolites which increasing the stress tolerance of plant. In addition, exogenous application of ABA enhances the tolerance of plants or plant cells to cold, heat, drought, anoxia and heavy metal stresses. This study was carried out to study the exogenous abscisic (ABA) acid induced regulatory role on the growth, water content, protein content, chlorophyll content, osmolyte accumulation and protein profiling through SDS PAGE in a halophyte, Suaeda maritima. The osmolyte accumulation of proline and glycine betaine was found to be more in 50 µM ABA concentrations. The protein profiling through SDS PAGE revealed that ̴ 66KDa proteins was not expressed in the control plant and in 10μM ABA treated plants. Interestingly, the ABA treatment induced a new protein of 14.2KDa in 10μM concentration. The ABA treated plants with concentrations 50μM, 100μM and 150μM showed changes in the expression of protein in abundance than the control and 10μM ABA treated plants. The findings in this study indicate that among all the concentrations, 50μM ABA concentration treated plants exhibited higher growth rate.
Highlights
Halophytes represent salt-tolerant species that thrive in the inhospitable habitats of inland and coastal salt marshes, dunes, beaches, deserts and salt flats
The plant performance in the harsh environment appeared to be directly limited by their ability to synthesize this plant growth regulator
Water content, the leaf area and photosynthetic pigments regarded as a growth parameter increased generally with the exogenous Abscisic acid (ABA) treatment under salinity stress according to the level of ABA treatment
Summary
Halophytes represent salt-tolerant species that thrive in the inhospitable habitats of inland and coastal salt marshes, dunes, beaches, deserts and salt flats They are adapted to survive under extreme conditions, represented by temperature, (freezing to very hot) salinity (hypo- to hyper-saline) and moisture (drought to water-logging) (Flowers et al, 1986; W.H.O, 1990). Suaeda maritima is an annual obligate halophyte that has the distinctive feature in that it thrives in both coastal and inland salt marshes It is a model plant and its salt-tolerance has been extensively investigated (Flowers et al, 1977; Yeo 1981; Greenway and Munns, 1983; Hajibagheri et al, 1985; Clipson 1987). The mechanism involved fast changes in intracellular Ca2+ concentration and stimulate farther signaling in the cell
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