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High salinity reduces the content of a highly abundant 23-kDa protein of the mangrove Bruguiera parviflora

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Abstract

A significant decrease in the amount of a protein, whose migration in two-dimensional gel electrophoresis corresponds to an apparent molecular mass of 23 kDa and pI=6.5, was observed in leaves of NaCl-treated Bruguiera parviflora (Roxb.) Wt. & Arn. ex Griff. seedlings. This particular salt-sensitive protein, designated as SSP-23, almost disappeared after 45 days of treatment in 400 mM NaCl as compared to untreated seedlings (0 mM NaCl) where the presence of the protein was significant. A polyclonal antibody raised against the 23-kDa protein was used to determine the subcellular localization of this protein in leaves by cross-reaction with proteins from isolated chloroplasts, mitochondria, peroxisomes and cytosol fractions on Western blots. SSP-23 was confirmed to be localized in the cytosol by immunoblotting. The disappearance of SSP-23 as a result of high NaCl treatment suggests that this protein is salt-sensitive and has a possible role in salt adaptation.

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Abbreviations

2-D :

Two dimensional

PAGE :

Polyacrylamide gel electrophoresis

SDS :

Sodium dodecyl sulfate

SSP :

Salt-sensitive protein

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Acknowledgements

The authors are grateful to Prof. P. Das, Director, Regional Plant Resource Centre, Bhubaneswar for providing laboratory facilities. The financial assistance from CSIR (Grant No. 38(983)/EMR-II), New Delhi, is duly acknowledged.

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Correspondence to Anath Bandhu Das.

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Parida, A.K., Mittra, B., Das, A.B. et al. High salinity reduces the content of a highly abundant 23-kDa protein of the mangrove Bruguiera parviflora. Planta 221, 135–140 (2005). https://doi.org/10.1007/s00425-004-1415-2

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