| DAB reaction was used to examine the active oxygen accumulation in Oidium heveae with host and non-host plants interaction, Mangifera indica, Acacia mangium, Stachytarpheta jamaicensis and Hevea brasiliensis were used in this study. The results showed that in the host interaction between O.heveae and Hevea brasiliensis, active oxygen was detectable after 24 h interaction, the epidermal cells produced relatively more active oxygen in the first 48 h. After 72 h interaction the radio of active oxygen reached the highest and then became weak, it could produce conidiophores and induce rubber tree disease after 120 h interaction. When O.heveae was inoculated with Acacia mangium, there was the same active oxygen accumulated as rubber trees. In the non-host interaction between O.heveae and Mangifera indica, much more active oxygen was accumulated in 12 h, but the reaction what the plant cell did could not resis the pathogen. When Stachytarpheta jamaicensis interacted with O.heveae, much more active oxygen was examined, and it could restrain the pathogen continue to expand effectively. These results suggested that active oxygen was one of the symbols of plant defense response in plant against O.heveae. |
