Year: 2018, Issue: December
Eco-toxicological effects of lead nitrate on the growth and pigment content of Eleusine coracana, Gaertn in pot culture under laboratory conditions.
Sabita Barik and Alaka Sahu
Lead, Residual level, Ragi seedlings, Ragi plants, Pigments, Protein, FAA.
Experiments were conducted at 14.6 mg of lead nitrate kg-1 dry soil mixture, as MAC dose in pot cultures. The dose was given once for short term experiments (6th days), twice for 15th days and thrice for 30th days to maintain constancy of the medium. Maximum residual lead accumulation was found in root when compared to leaf or shoot in different days of exposure. The shoot of the seedling after 30th days of exposure showed 5.66±0.18 mg of lead g-1 dry weight on 30th day old seedlings. The root of the seedling showed 2.11±0.11 mg of lead g-1 dry weight on 6th day old seedlings. The root of the seedling after 15th days of exposure showed 4.26±0.19 mg of lead g-1 dry weight on 15th day old seedlings. The root of the seedling after 30th days of exposure showed 4.97±0.28 mg of lead g-1 dry weight on 30th day old seedlings. The root being the primary site of absorption at the first place recorded the maximum amount of lead. The absorbed lead was translocated to shoot and leaf, hence at all exposure periods the exposed root showed maximum amount of accumulation and the impact was high on roots than the shoot. The chlorophyll, phaeophytin, carotenoid, protein and free amino acid content of the lead exposed seedlings and plant, significantly declined at all exposure periods and the impact was severe on 30th day old ragi plants.