Effect of salinity stress on growth,peroxidase and IAA oxidase activities in vigna seedlings |
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Authors: | Pujari?D?S Email author" target="_blank">Chanda?S?V?Email author |
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Institution: | (1) Department of Biosciences, Saurashtra University, 360 005 Rajkot, India |
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Abstract: | The present work was carried out with the aim of studying the effect of salinity stress on growth and IAA oxidizing system
(i.e. peroxidase and IAA oxidase) in vigna (Vigna unguiculata L.) seedlings. The seedlings were treated with two concentrations of sodium chloride (NaCl) 0.1 M and 0.25 M. Length, fresh
and dry weight were the parameters considered for growth. Salinity effect was distinct in fresh weight and dry weight of different
organs. Peroxidase and IAA oxidase activities were measured at different time intervals for both cytoplasmic and wall bound
fractions. Peroxidase activity was maximum at higher stress conditions bringing about the hypocotyl growth restriction. Thus
there was a clear inverse correlation between elongation and peroxidase activity. IAA oxidase activity also showed a similar
trend for both cytoplasmic and wall bound fractions. The role of IAA oxidizing system in defense mechanism in response to
salinity stress is discussed. |
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Keywords: | Vigna unguiculata salinity stress peroxidase IAA oxidase hypocotyl elongation |
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