Abstract:

Antioxidases are important defensive substance in plants, and can maintain balance of oxidative metabolisms in vivo to ensure healthy growth of plants. In this study, the activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) in needles of hybrids between Larix kaempferi, L. gmelinii and L. olgensis were assayed with UV-spectrometry to investigate variation in the enzymes among the hybrids. The results showed that there were significant difference (P<0.01) in SOD, CAT and POD activities among 7 families hybrids of two generations. Though POD activity of F1 generation was lower than F2 generation, activities of the CAT or SOD were higher than F2 generation, suggesting that heterosis of F1 generation was greater than F2 generation. Additionally, some hybrids, such as F1 generation of L. kaempferi 3 ×L. gmelinii 2, and F2 generation of L. kaempferi 12 ×L. gmelinii 9, expressed strong resistance to pests and could be used as resistance resources against larch pests.

Key words: larch hybrids, catalase, peroxidase, superoxide dismutase