Evaluation of Hyacinth bean (Lablab purpureus) genotypes for salinity-tolerance

Soil salinity is one of the most severe factors limiting growth and productivity of crops. Changes in antioxidants and antioxidant enzymes in response to salinity stress of four Dolichos lablab (Lablab purpureus L. sweet) genotypes were investigated. Stress indicators like H2O2, lipid peroxidation, antioxidants such as GSH, proline, Asc and antioxidant enzymes such as GPOX, CAT and GR, metabolic enzymes like AP and AMY were analyzed in ten days old seedlings under salt stress. Salt-induced oxidative stress was observed in all four genotypes with greater lipid peroxidation in HA4. Inter-varietal differences were observed in extent of elevation in GSH, Asc and Proline. The genotypes also differed in terms of antioxidant and metabolic enzyme pattern. While three varieties seem to rely on antioxidants for salt stress response, HA4 appeared to rely on both antioxidants and antioxidant enzyme.