ASSESSMENT OF HEAVY METAL STRESS ON SEEDLING PHYSIOLOGY, PHOTOSYNTHETIC PIGMENT AND OSMOTIC ADJUSTMENT IN SORGHUM VULGARE VAR. CO (28)

Paul, Priya Vasudevan
2017 International Journal of Research in Plant Science   unpublished
The present study aims to find out the effect of heavy metals such as Lead, Zinc and Mercury on seedling physiology, photosynthetic pigment and osmotic adjustment in Sorghum vulgare. A pot experiment was conducted and Plants were treated with lead, mercury and copper at various concentrations like 200, 400, 600, 800 and 1000 µM. The seedlings physiology, photosynthetic pigment and osmolytes such as sugar, aminoacid and nitrogen were estimated in Sorghm vulgare under heavy metal stress. All
more » ... al stress. All three heavy metals were reduced the seed germination in Sorghum. Among them mercury was found to be highly inhibitory and zinc was least. The three heavy metals were inhibited chlorophyll a and chlorophyll b contents under heavy metal stress. Compatible solute of total free amino acid was decreased in Sorghum. However, lead (84%) was found to be inhibited more than mercury (21%). In Sorghum, heavy metals were displayed inhibitory effect on the total sugars. The nitrogen levels showed increase with increase in concentrations up to 800 μM before a sharp decline at 1000 μM of sorghum. Sorghum was found to be responding differently to different heavy metal ions in varying concentrations. Among the salts analyzed in the investigation, mercury was found to be highly inhibitory, followed by lead and zinc.
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