Seed Treatment with ?-Tocopherol Regulates Growth and Key Physio-Biochemical Attributes in Carrot (Daucus carota L.) Plants under Water Limited Regimes

The influence of seed priming with varying levels (50 and 100 mg L?1) alpha-tocopherol (Toc) was investigated in carrot plants under water-deficit conditions. For this purpose, two cultivars carrot, DC4 DC90, were selected subjected to well-watered (100% field capacity (FC)) stress (50% FC). After 21 days conditions, a significant suppression observed shoot root fresh dry weights, their lengths, chlorophyll a, b total contents, soluble proteins (TSP). However, an up-regulatory effect water on the concentrations glycinebetaine (GB), hydrogen peroxide (H2O2), malondialdehyde (MDA), ascorbic acid (AsA), phenolics as well activities catalase (CAT) peroxidase (POD) enzymes. Exogenous application effective reducing accumulation H2O2 MDA contents improving all growth attributes, chlorophyll, proline, GB, AsA, phenolics, TSP, CAT POD Of both cultivars, cv. had better performance terms whereas response similar other attributes regimes. Overall, it is suggested that L?1 Toc plant osmoprotectants oxidative defense system