Effect of Growth Regulators on IAA-Oxidase and Peroxidase Activity in Soybean Under Salinity
Abstract
The present investigation was conducted in pots to assess the seed soaking effect of GA3 and IAA in soybean (Glycine max L. Merill, cv. Bragg) under soil salinity conditions. Increasing levels of salinity enhanced the IAA-oxidase activity in leaves. Peroxidase activity showed marginal decrease in leaves and increase in root at lower salinity (6 dS/m), but declined significantly in both leaves and root at higher salinity level (12 dS/m). Seed treatment with growth regulators (GA, and IAA) reduced the IAA-oxidase activity but the effect was more pronounced with IAA (200 ppm). Peroxidase activity showed gradual increase in both leaves and root with both the growth regulators but GA3 was found comparatively more effective.
