Photosynthetic Capacity, Stomatal Behavior and Chloroplast Ultrastructure in Leaves of the Endangered Plant Carpinus putoensis W.C.Cheng during Gaseous NO2 Exposure and after Recovery

摘要: Foliar uptake of gaseous NO2 mainly occurs through the stomata and disrupts normal plant growth, but no detailed reports about physiological responses plants exposed to are available. In this study, study leaf physicochemical responses, stomatal characteristics chloroplast structure, we observed leaves Carpinus putoensis W.C.Cheng after exposure (6 μL/L) for five time periods (0, 1, 6, 24, 72 h) 30 days recovery following exposure. Our results showed that short-duration a high concentration had significant negative impacts (p < 0.05) on chlorophyll content, photosynthesis chloroplast-related processes C. leaves; with exception one hour exposure, which was helpful responses. Moreover, significantly increased thickness palisade/spongy tissue caused swelling thylakoids within chloroplasts; thylakoid could be reversed by removing pollutant from air flow. Restoration unpolluted alleviated toxic effects NO2, as indicated an net photosynthesis, PSII maximum quantum yield. These support development treatment roadside trees major road pollutant.