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Differential Tolerance to Aluminium Toxicity in Rice Cultivars: Involvement of Antioxidative Enzymes and Possible Role of Aluminium Resistant Locus

4 Abstract: The effect of Aluminium (80µM) on seedlings of two rice cultivars varying in their sensitivity to aluminium was investigated with different pH conditions ranging from 7 to 4 and with different age groups from 4 to 28 days. With decrease in pH of the culture solution below 5, Aluminium caused reduction in plant growth, high level of aluminium accumulation in roots, increased lipid peroxidation and higher activity of SOD and peroxidase, with cultivars of Vikas (VIK) exhibiting more pronounced alterations than Suraksha (SUR). Similarly, when compared to 28-day old plants, the seedlings of early age groups showed reduced plant growth, accumulated higher levels of aluminium, showed more lipid peroxidation and increased activity of SOD and peroxidase under Al stress, with cultivars of VIK being more affected than SUR. In RAPD analysis, presence of an amplified fragment of 800-600 base pairs was noted in Al-treated cultivars of SUR which did not appear in treated cultivars of VIK and also in control seedlings of both the cultivars. Our observations demonstrate that under aluminium stress, among the two rice cultivars, seedlings of VIK are relatively more sensitive than SUR at lower pH and amongst VIK, seedlings of early age groups are less resistant than older seedlings.