Physiological respons of rice plants to Oulema oryzae feeding
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Key Words：rice, Oulema oryzae, defense enzymes
Abstract： The activity of four enzymes (POD, SOD, CAT and MDA) in rice varieties with different resistance to Oulema oryzae Kuwayama were investigated following insect browsing and mechanical damage to rice plants. The results suggest that SOD activity increased from 0 h to 96 h and that the other enzymes first increased and then decreased. Although MDA activity decreased more in resistant relative to other rice varieties, the activities of all enzymes were greater in both resistant and susceptible varieties compared to the controls. Furthermore, variation in CAT activity was obviously higher in the resistant than in the sensitive variety 24 h and 48 h after insect browsing. There was little difference in enzyme activity between plants subject to insect feeding and those subject to mechanical damage.