Journal
JOURNAL OF PLANT PHYSIOLOGY
Volume 163, Issue 1, Pages 11-18Publisher
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2005.02.011
Keywords
antioxidant enzymes; salt stress; salinity; nitrogen nutrition; indole alkaloids; Catharanthus roseus
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The activities of antioxidant enzymes viz. glutathione reductase, GR; superoxide dismutase, SOD; peroxidase, POD; catalase, CAT and glutathione-S-transferase, GST and alkaloid accumulation were investigated in leaf pairs (apical, middle, basal) and in roots of Catharanthus roseus seedlings under the conditions of different nitrogen sources (20 mM KNO3 and 2 mM NH4Cl) and salinity, in the absence (non-saline control) and in the presence of 100 mM NaCl in the nutrient solution. Salinity caused a reduction in plant biomass. The biomass production of ammonium-fed plants was tower than that of nitrate-fed plants. The antioxidant enzymes exhibited higher activity in saline-treated plants. Changes in antioxidant enzyme activity caused by different nitrogen sources differed in all leaf pairs, as well. as in roots of C. roseus. Ammonium-fed plants showed higher CAT, GR and GST activity in leaf pairs as well as in roots, while POD and SOD activity were higher in nitrate-fed plants. Higher peroxidase activity concomitant with the increased accumulation of alkaloid was found in all leaf pairs, as well as in roots of C. roseus of NO3- fed plants as compared to NH4+ fed plants. (C) 2005 Elsevier GmbH. All rights reserved.
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