This research describes the influence of acidic stress on wheat delayed ultraweak bioluminescence (DUB). Wheat seedling was selected to investigate correlation among the DUB change, ecology change and content changes of such endogenous physiological chemicals as chlorophyll a, chlorophyll b , carotenoid and malonyldialdehyde in wheat leaves. The results showed the coherence of carotenoid and malonyldialdehyde content with the intensity of DUB. The activities of such endogenous antioxidation enzymes as POD, SOD and CAT under the stress of acid rain, which indicated the free racial and EfeOx quantities in plant tissue, were studied. It was also found that within the first six days after treatment acid rain stress significantly increased POD, CAT and SOD activities, while catalase activity was restrained, both POD and SOD activities were enhanced and contributed to the scavenging and detoxification of active oxygen species. The result demonstrates that DUB can be used to detect pollution and to measure the influence of environmental factor on plant growth and development.

Key words: WHEAT, ACID RAIN, ENVIRONMENTAL POLLUTION, ADVERSITY RESISTANCE