VARIATION IN STRUCTURAL CARBOHYDRATES OF FORAGE SORGHUM [SORGHUM BICOLOR (L.)MOENCH] UNDER SALINE CONDITIONS
HIMANI1*, SURINA BHADU1, JAYANTI TOKAS1 AND SATPAL2
1Department of Biochemistry
2Forage Section, Department of Genetics & Plant Breeding
CCS Haryana Agriculture University, Hisar- 125004, Haryana, India
*(e-mail : himanipunia91@gmail.com)
(Received : 26 August 2019; Accepted : 26 September 2019)

SUMMARY

Sorghum, green forage is well adapted to semiarid zones to feed livestock under saline regimes. In present study, structural fibrous fractions were evaluated in two sorghum genotypes viz. G-46 and S-713 under different salinity treatments (6, 8 dS/m) to quantify their values. Structural carbohydrate concentrations varied among genotypes and salinity levels. As the salinity level increased, there is reduction of all cell wall components. The cell wall constituents (NDF, ADF, HC, cellulose, lignin) exhibited upward trend with the plant maturity. The NDF content varied from 67.05 to 48.87 % with a relative mean value of 57.96% and at 95 DAS 59.65-76.02 %. Maximum ADF content was observed at maturity stage with a mean value of 40.82%. A significant difference was observed between different growth stages. For total lignin content, the reduction varies from 8.09-6.17 % with a mean value of 5.59 % at 35 DAS. With advancement of maturity, amount of lignin content increased with a mean value of 7.31%. Cellulose and hemicellulose content ranged from 38.09-27.07%, 29.04-24.97 % with mean values of 28.58 and 23.92 %, respectively. Overall, G-46 genotype performed better at all salinity levels and possessed maximum structural fiber fraction and might be a used in future breeding programmes to improve the fiber fractions.

Key words:Sorghum, structural carbohydrates, forage, fodder, cellulose, lignin