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

Protoplasma
Singh Laxmi RanjitSuprasanna Penna

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 ...Continue Reading

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Citations

Oct 21, 2016·Protoplasma·Nisha ShabnamP Pardha-Saradhi
Jan 14, 2018·Protoplasma·Salar Farhangi-Abriz, Shahram Torabian
Jan 10, 2018·Frontiers in Plant Science·Marta MarmiroliNelson Marmiroli
Dec 6, 2017·The New Phytologist·Yongqing Yang, Yan Guo

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