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EFFECT OF SUPPLEMENTARY UV-B RADIATION ON PHOTOSYNTHETIC PARAMETERS IN LEAVES OF WOONYOUNGIA SEPTENTRIONALIS
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF APPLIED & ENVIRONMENTAL BIOLOGY
- Issue:
- 4
- DOI:
- 10.3321/j.issn:1006-687X.2002.04.001
- Key Word:
- 焕镛木;UV-B辐射;光合作用
Abstract： 补增UV-B辐射,焕镛木(Woonyoungia septentrionalis)叶片的光饱和光合速率较自然光下的降低29%,叶片的光合量子产率降低50.4%,光能转换效率亦降低49%. 补增UV-B辐射抑制光下呼吸速率(Rd),但不明显改变不包括光下呼吸的CO2补偿点. 补增UV-B辐射,焕镛木叶片的RuBP饱和的最大羧化速率和最大电子传递速率分别较自然光下的低43.4%和46.4%,Jmax : Vcmax亦降低,显示补增UV-B辐射对Jmax的影响较Vcmax明显. 补增UV-B辐射亦引起磷酸三碳糖利用速率降低. 叶片多个生化过程被抑制可能是引起植物光合速率降低的原因. 补增UV-B辐射,降低了气孔对空气CO2浓度和相对湿度变化的敏感度,则可能影响植株对环境因素变化的适应性. 图3 表4 参23
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