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Effect of salinity on chlorophyll and proline contents in three aquatic macrophytes

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Biologia Plantarum

Abstract

The role of proline in imparting tolerance to salinity was investigated in Hydrilla verticillata, Najas indica and Najas gramenia. The plants were exposed to different concentrations of NaCl and artificial sea water (SWS) separately. The chlorophyll (Chl) a/b ratio decreased significantly in all the three plant species in both NaCl and SWS treatments, comparatively more in former than the latter. NaCl resulted in drastic decrease in this ratio in salt sensitive H. verticillata and N. indica, but in somewhat lesser decrease in salt resistant N. gramenia. Proline content increased at both NaCl and SWS treatments, especially at the latter. However, in H. verticillata proline content at 1.5 and 2.5 % NaCl decreased. It was concluded that proline cannot be used as a biochemical marker of salt tolerance in aquatic plants, however, the decrease in Chl a/b ratio in response to NaCl may be used as an index of salt sensitivity in this ecological group of plants.

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Authors and Affiliations

  1. Institute of Life Sciences, 301 Sahid Nagar, Bhubaneswar, 75 1007, Orissa, India

    N.P. Rout, S.B. Tripathi & B.P. Shaw

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  1. N.P. Rout
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  2. S.B. Tripathi
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  3. B.P. Shaw
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Rout, N., Tripathi, S. & Shaw, B. Effect of salinity on chlorophyll and proline contents in three aquatic macrophytes. Biologia Plantarum 40, 453–458 (1997). https://doi.org/10.1023/A:1001186502386

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