Julkunen-Tiitto Riitta, Häggman Hely, Aphalo Pedro J, Lavola Anu, Tegelberg Riitta, Veteli Timo
Natural Product Research Laboratory, Department of Biology, University of Joensuu, PO Box 111, FIN-80101 Joensuu, Finland.
Environ Pollut. 2005 Oct;137(3):404-14. doi: 10.1016/j.envpol.2005.01.050.
Reflection by waxy or resinous surface structures and hairs, repair reactions of biomolecules and induction of different sheltering components provide the means of plant protection from harmful solar UV-B radiation. Secondary products, especially flavonoids and phenolic acids as defense components are also important in plant tolerance to UV-B, fulfilling the dual role as screens that reduce UV-B penetration in plant tissues, and as antioxidants protecting from damage by reactive oxidant species. Plants are sensitive to UV-B radiation, and this sensitivity can be even more clone-specific than species-specific. The results available in the literature for deciduous trees and shrubs indicate that UV-B radiation may affect several directions in the interaction of woody species with biotic (herbivores) and abiotic (CO2 and nutrition) factors depending on the specific interaction in question. These multilevel interactions should have moderate ecological significance via the overall changed performance of woody species and shrubs.
蜡质或树脂状表面结构及毛发的反射、生物分子的修复反应以及不同防护成分的诱导，为植物抵御有害的太阳紫外线B辐射提供了手段。次生产物，尤其是作为防御成分的类黄酮和酚酸，在植物对紫外线B的耐受性方面也很重要，它们发挥着双重作用，既作为减少紫外线B穿透植物组织的屏障，又作为抗氧化剂保护植物免受活性氧物质的损害。植物对紫外线B辐射敏感，而且这种敏感性在克隆水平上甚至比物种水平上更具特异性。文献中关于落叶乔木和灌木的研究结果表明，紫外线B辐射可能会根据具体的相互作用，在木本植物与生物（食草动物）和非生物（二氧化碳和营养）因素的相互作用中影响多个方面。这些多层次的相互作用通过木本植物和灌木整体性能的改变应具有适度的生态意义。
