Abstract:

Abstract: A new rice variety, Jindao 10 named 990162 originally, was bred by method of nitrogen ion beam implantation. The activity of antioxidant enzyme and malondialdehyde (MDA) content were measured in organs of root, stalk and leaf, and in developmental stages of tillering and elongation to compare the antioxidant capacities of two rice cultivars, 990162 and Nihonbare. The results showed that the activity of antioxidant enzyme and MDA content had no significant differences between the two rice cultivars, and also no significant differences between the two developmental stages in same organ of any one cultivar. However, significant differences were found among the three organs. In tillering stage, SOD activities in leaves were 2.0- and 1.8-fold higher than that in roots in 990162 and in Nihonbare, respectively; CAT activities in leaves were 2.2- and 2.3-fold higher than that in roots in 990162 and in Nihonbare, respectively. In elongation stage, CAT activities in leaves were 2.2- and 1.8-fold higher than that in roots and in stems in 990162, and were 1.9- and 1.8-fold higher than that in roots and in stems in Nihonbare, respectively; MDA contents in leaves were 1.4-times higher than that in roots in 990162. These results indicated that the antioxidant abilities of the two rice cultivars were similar and the antioxidant capacity of leaf was the strongest.