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Protoplasma

, Volume 253, Issue 1, pp 101–110 | Cite as

Early osmotic, antioxidant, ionic, and redox responses to salinity in leaves and roots of Indian mustard (Brassica juncea L.)

  • Singh Laxmi Ranjit
  • Pandey Manish
  • Suprasanna PennaEmail author
Original Article

Abstract

Salt-stress-induced alterations in osmotic, ionic, and redox responses were studied in the early period of treatment (30 min to 5 days) in seedlings of Brassica juncea L. Roots and shoots under mild (50 mM) and severe (250 mM) NaCl stress were analyzed for growth, oxidative stress, osmolyte accumulation, antioxidant defense, and redox state. Growth reduction was less pronounced in the early time period of salt stress while oxidative damage increased linearly and in a sustained manner under severe stress up to 6 h. An early and transient reactive oxygen species (ROS) burst, as evidenced by superoxide and hydrogen peroxide level was observed, followed by activation of enzymatic antioxidant system (GPX, SOD, CAT, and GR) in both root and shoot. The enzymatic activity was not affected much under mild stress particularly at early phase; however, severe stress induced a significant increase in the activity of antioxidant enzymes. Root ascorbate was progressively accumulated, and its redox state maintained in the early time phase of treatment under mild stress while increase in root and shoot glutathione content was recorded under mild stress at 5 days when the active ascorbate pool decreased. While early period of salt stress showed significant Na+ accumulation over control, plants subjected to mild stress measured less Na+ accumulation up to 5 days compared to severely stressed plants. The results showed an early induction of differential responses to salt stress in roots and shoots of Brassica which include growth limitations, reduced relative water content, increased osmolytes, redox state, and antioxidant system, and a significant Na+ increase. The results also indicate that roots and shoots may have distinct mechanisms of responses to salt stress.

Keywords

Brassica Roots and shoots Salt stress Early events H2O2 Antioxidant enzymes Sodium-potassium 

Notes

Acknowledgements

Authors thank Dr Ashok Badigannavar for help in PCA analysis.

Supplementary material

709_2015_792_MOESM1_ESM.doc (145 kb)
ESM 1 (DOC 145 kb)

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Copyright information

© Springer-Verlag Wien 2015

Authors and Affiliations

  • Singh Laxmi Ranjit
    • 1
  • Pandey Manish
    • 1
  • Suprasanna Penna
    • 1
    Email author
  1. 1.Plant Stress physiology and biotechnology Section, Nuclear Agriculture and Biotechnology DivisionBhabha Atomic Research CentreTrombayIndia

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