Biochemical Studies on amelioration of phytotoxic effect of chromium (VI) in sorghum (Sorghum bicolor L.)
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Date
2012
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
The present investigation had been done to study the effect of amelioration of toxic effect of
Cr (VI) on morphological and biochemical parametersof sorghum. The plants were grown in plastic
pots with four level of chromium concentration [control (0.0, 1.0 mg Cr (VI) kg
-1
soil,2.0 mg Cr
(VI) kg
-1
soiland 4.0mg Cr (VI) kg
-1
soil).To ameliorate the toxic effect of Cr (VI) given different
treatments of salicylic acid and ferrous sulphate viz. pre-treatment, soil treatment and foliar spray or
both. Morphological parameters like plant height, number of leaves, root length, fresh and dry weight
of leaves, stem and root decreased with an increasein the chromium concentration. The chlorophyll ‘a’,
chlorophyll ‘b’, total chlorophyll content decreased whereas, structural carbohydrates viz. NDF, ADF,
cellulose, lignin and silica significantly increased with increasing chromium concentration. Nonstructural carbohydrate (total sugars, reducing sugars and non-reducing sugars), crude protein content
and IVDMD decreased with an increase in chromium concentration. Minerals like sodium, chromium
and zinc content increased with increase in chromium concentration. The iron and potassium content
decreased with increase in chromium concentration. Growth of sorghum plant was reduced very
significantly in excess chromium. This loss in growth of sorghum plant was recovered partially by
different treatments by salicylic acid (0.5 mM) andFeSO
4-EDTA solution (0.25 mM and 0.5 mM). The
recovery in biomass of sorghum was maximum when FeSO4-EDTA solution was applied through both
the ways i.e. through roots and through foliar spray together.
Description
Keywords
Heavy metal stress, Morphological parameters, Biochemical parameters, Nutritive value