Classification of Sugarcane Genotypes Based on Heat Stress and Morphological Parameters
Leaves of thirteen genotypes of sugarcane were treated in the oven for heat stress. The treated leaves were used for the estimation of phenolic contents and the measurement of lipid peroxidation. Minimum moisture loss is showed by CSSG-668 and maximum moisture loss showed by NSG-45. Maximum phenolic contents were observed in HSF-240 (65.7 mg GAE/100 ml) and minimum results showed by Lho 83-153 and CP-43-33 (32.98 and 33.78 mg GAE/100 ml). Lho 83-153, HSF-242 and S-2002-US-133 were showed high tolerant against heat therefor, showed higher membrane stability, maintenance of high fv/fm ratio under heat stress and lower lipid peroxidation of membranes. Hence, the relative tolerance of genotype to heat stress as reflected by its lower lipid peroxidation, higher membrane stability and pigment concentration is related to the levels of activity of its antioxidant enzymes.
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