24-epibrassinolide and spermidine modulate photosynthesis and antioxidant systems in Vigna radiata under salt and zinc stress
- Plant Physiology Section, Department of Botany, Aligarh Muslim University, Aligarh 202 002 India
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Brassinosteroids and polyamines are widely used to overcome various abiotic stresses including salinity (NaCl) and heavy metal stresses in plants. In the present investigation, co-application efficacy of 24-epibrassinolide (EBL) and spermidine (Spd) on the salt stress in the form of NaCl (100 mM), and zinc toxicity in the form of zinc sulphate (200 mg kg-1 soil) were evaluated in Vigna radiata (L.) Wilczek. At 15 d stage, the seedlings were sprayed with deionized water (control), 1mM Spd and/or 10-8 M EBL and plant responses were studied at 30 days after sowing. The salinity and zinc stress significantly reduced the plant growth, gas exchange parameters but increased antioxidant enzyme activity, proline content and electrolyte leakage in the leaves. Furthermore, out of the two plant growth regulators (EBL/Spd), EBL excelled in its effects. Toxic effects generated by salinity and zinc metal stress were completely overcome by the combination of these two plant growth regulators.
[Bilal A. Mir, Tanveer A. Khan, Qazi Fariduddin (2015); 24-epibrassinolide and spermidine modulate photosynthesis and antioxidant systems in Vigna radiata under salt and zinc stress Int. J. of Adv. Res. 3 (May). 592-608] (ISSN 2320-5407). www.journalijar.com
