Response of radish genotypes to short term cold stress in relation to biochemical changes and antioxidant activity

Mubashir Ahmad Wani., Hilal Ahmad Qazi., UmerYaqoob., Sujat Ahmad Lone., Riffat John

Three genotypes of Raphanus sativus differing in their sensitivity to low temperatures were compared with respect to the effects of CS on total chlorophyll (TC), proline content (Pro), electrolytic leakage (EL), malondialdehyde level (MDA), glycine betaine (GB) and activities of antioxidant enzymes like catalase (CAT), superoxide dismutase (SOD) and glutathione reductase (GR). The genotypes; Scarlet globe (SG), Red Anantnag (RA) and White round (WR) were subjected to the CS of 4oC and it was observed that CS affects the overall performance of all the three genotypes of R. sativus but among all genotypes SG has improved antioxidant enzyme activities (CAT, SOD and GR) and higher accumulation of different osmolytes viz proline, GB, etc. We conclude that SG genotype is most resistant to the CS whereas WR is the cold susceptible genotype and cold tolerant genotype has advantage of having improved osmotic adjustments and protection from generation of free radicles by increased osmolyte accumulation and increased activities of antioxidant enzymes.

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