caa a22 4500 469096217 CHVBK 20180323133031.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF00317843 doi (NATIONALLICENCE)springer-10.1007/BF00317843 Are some plant life forms more effective than others in screening out ultraviolet-B radiation? [Elektronische Daten] [T. Day, T. Vogelmann, E. DeLucia] Summary: The unprecedented rate of depletion of the stratospheric ozone layer will likely lead to appreciable increases in the amount of ultraviolet-B radiation (UV-B, 280-320 nm) reaching the earth's surface. In plants, photosynthetic reactions and nucleic acids in the mesophyll of leaves are deleteriously affected by UV-B. We used a fiber-optic microprobe to make direct measurements of the amount of UV-B reaching these potential targets in the mesophyll of intact foliage. A comparison of foliage from a diverse group of Rocky Mountain plants enabled us to assess whether the foliage of some plant life forms appeared more effective at screening UV-B radiation. The leaf epidermis of herbaceous dicots was particularly ineffective at attenuating UV-B; epidermal transmittance ranged from 18-41% and UV-B reached 40-145 μm into the mesophyll or photosynthetic tissue. In contrast to herbaceous dicots, the epidermis of 1-year old conifer needles attenuated essentially all incident UV-B and virtually none of this radiation reached the mesophyll. Although the epidermal layer was appreciably thinner in older needles (7 y) at high elevations (Krumholtz), essentially all incident UV-B was attenuated by the epidermis in these needles. The same epidermal screening effectiveness was observed after removal of epicuticular waxes with chloroform. Leaves of woody dicots and grasses appeared intermediate between herbaceous dicots and conifers in their UV-B screening abilities with 3-12% of the incident UV-B reaching the mesophyll. These large differences in UV-B screening effectiveness suggest that certain plant life forms may be more predisposed than others to meet the challenge of higher UV-B levels resulting from stratospheric ozone depletion. Springer-Verlag, 1992 Conifer nationallicence Epidermis nationallicence Fiber-optic nationallicence Optical properties nationallicence Ozone depletion nationallicence Day T. Department of Biology, West Virginia University, 26506, Morgantown, WV, USA aut Vogelmann T. Department of Botany, University of Wyoming, 82071, Laramie, WY, USA aut DeLucia E. Department of Plant Biology, University of Illinois, 61801, Urbana, IL, USA aut Oecologia Springer-Verlag 92/4(1992-12-01), 513-519 0029-8549 92:4<513 1992 92 442 https://doi.org/10.1007/BF00317843 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317843 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Day T. Department of Biology, West Virginia University, 26506, Morgantown, WV, USA aut NATIONALLICENCE 700 1- Vogelmann T. Department of Botany, University of Wyoming, 82071, Laramie, WY, USA aut NATIONALLICENCE 700 1- DeLucia E. Department of Plant Biology, University of Illinois, 61801, Urbana, IL, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 92/4(1992-12-01), 513-519 0029-8549 92:4<513 1992 92 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer