Acclimatory response to hydrogen peroxide and glutathione under salt-boron stress through their impact on mineral nutrition and antioxidant defense system in pigeonpea (Cajanus cajan L.)

Abstract Investigations were carried out on a salt tolerant (Manak, H77-216) and a comparatively salt sensitive (ICPL 88039) genotypes of pigeonpea (Cajanus cajan L. Millsp.) under NaCl, B and NaCl + B stress to examine the acclimatory response to $ H_{2} %$ O_{2,} $ glutathione and $ H_{2} %$ O_{2}...
Ausführliche Beschreibung

Abstract Investigations were carried out on a salt tolerant (Manak, H77-216) and a comparatively salt sensitive (ICPL 88039) genotypes of pigeonpea (Cajanus cajan L. Millsp.) under NaCl, B and NaCl + B stress to examine the acclimatory response to $ H_{2} %$ O_{2,} $ glutathione and $ H_{2} %$ O_{2} $ + glutathione through their effect on mineral nutrition, morpho-physiological parameters and antioxidant defense system. Both B and NaCl alone and their combinations had deleterious effect on dry biomass of plumule, enhanced relative stress injury (RSI), lipid peroxidation with concomitant increase in Na, Cl and B contents. However it did not bear any correlation with osmotic potential of plumule and K contents. Antioxidative enzymes like superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), peroxidase (POX) and glutathione reductase (GR) also decreased with salt, B and salt + B treatments. However contents of $ H_{2} %$ O_{2} $ enhanced and that of ascorbate declined under aforementioned treatments. These injurious effects are partially alleviated by exogenous application of $ H_{2} %$ O_{2} $; glutathione (GSH) and $ H_{2} %$ O_{2} $ + GSH treatments. The role of $ H_{2} %$ O_{2} $ and GSH in the present study is suggestive of triggering multifunctional signal transduction in plant defense mechanisms to prevent cellular oxidation, membrane injury, lipid peroxidation and protein enzyme inactivation. Ausführliche Beschreibung