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目的:为了阐明紫外辐射胁迫对药用植物胡椒薄荷生长发育的影响,模拟大气中紫外辐射增强的情况,考查了不同强度UV-B辐射胁迫对胡椒薄荷的光合作用的影响。方法:实验设置了自然光对照(0 W.m-2),轻度UV-B辐射胁迫(0.15 W.m-2)和重度辐射胁迫(0.35 W.m-2)3个不同处理组,探讨了不同强度UV-B辐射对胡椒薄荷叶绿体超微结构、光合作用和叶绿素荧光参数的影响。结果:在轻度UV-B辐射胁迫下,胡椒薄荷叶绿体超微结构虽然受到了一定程度的破坏,但处理过程中,Fv/Fm,Fv/Fo,qP,ΦPSⅡ和ETR在一段时间内降低后仍能恢复到和自然光对照相当的水平,qN表现出先升高后降低的趋势,而处于重度UV-B辐射胁迫下的胡椒薄荷,由于其光合机构受到严重破坏,通过自身保护机制已不能恢复到相应水平。结论:胡椒薄荷处于轻度UV-B辐射胁迫时,光合能力虽然在一定程度上有所降低,但是可以通过较强的热耗散来保护光合机构。研究证实胡椒薄荷对轻度紫外辐射胁迫有良好的适应能力,可在紫外辐射偏强的地方广泛种植,具有一定的经济效应。
OBJECTIVE: To clarify the effects of ultraviolet radiation stress on the growth and development of medicinal plant peppermint, and to simulate the enhancement of ultraviolet radiation in the atmosphere, the effects of UV-B radiation stress on peppermint photosynthesis were investigated. Methods: Three treatments of natural light (0 Wm-2), mild UV-B radiation (0.15 Wm-2) and severe stress (0.35 Wm-2) Effects of Radiation on Ultrastructure, Photosynthesis and Chlorophyll Fluorescence Parameters of Peppermint Chloroplast. Results: Under mild UV-B radiation stress, although the ultrastructure of peppermint chloroplast was destroyed to some extent, the Fv / Fm, Fv / Fo, qP, ΦPSⅡ and ETR decreased after a certain period of time But still recovered to the level comparable to that of natural light. The QN showed the trend of first increasing and then decreasing. However, peppermint under severe UV-B radiation stress could not restore to its original protective mechanism due to its severe damage to the photosynthetic machinery The corresponding level. CONCLUSION: The photosynthetic capacity of peppermint under mild UV-B radiation stress is reduced to a certain extent, but the photosynthetic mechanism can be protected by strong heat dissipation. Studies have shown pepper peppermint mild UV radiation stress have a good adaptability, can be widely grown in areas with strong UV radiation, has a certain economic effect.