Phytotoxicity of Fluoride in Guar (Cyamopsis tetragonoloba) Cultivars and its Effect on Morpho-Physiological and Biochemical Traits

This study reports the influence of 0 (1.42), 25, 50, 100, 200 and 400ppm (artificial contaminated water) fluoride on guar (Cyamopsis tetragonoloba L. cultivar local and sadabahar). Seedlings showed decrease in the following morphophysiological and biochemical characteristics: growth, leaf area expansion, SPAD value, chlorophyll fluorescence, yield and antioxidant enzymes, i.e. catalase, peroxidase and superoxide dismutase. At 400ppm F-contaminated irrigation water the average leaf area expansion (∼58 and 45%), shoot-root length (∼45, 46% (local) and ∼23, 54% (sadabahar), SPAD value (∼11, 25, 18% (local) and ∼12, 20, 15% (sadabahar), Fv/Fm (∼8, 11, 16% (local) and ∼6, 9, 12% (sadabahar), catalase (∼21 and 16%), peroxidise (∼42 and 38%) and SOD (∼40 and 39%) in local and sadabahar cultivar, respectively. With increasing F concentrations, growth, physiological and enzyme activity were successively reduced with days and duration of treatment frequency.