地球環境科学研究科 植物生態学セミナー   2009-05-12 (Tue) 10:30
(場所: A804 )

Review seminar: The effects of ultraviolet on plants

Ayumi Hirata

Human-induced CFCs (chlorofluorocarbons, the gases used as cooling medium) have destroyed stratospheric ozone layer, and ultraviolet (UV) radiation reaching the surface of the Earth increases. UV radiation may damage cells, and is harmful to organisms. Many UV-B enhancement studies on plants have been conducted with using UV lamps since 1990s. But there are a few studies conducted in natural ecosystems under solar UVA and UVB. Results between UV lamp studies in lab. and field studies are often conflicting.

I researched solar-UV-excluded experiments using several types of filters (-UVA and UVB, -UVB, -50%UVA,UVB and PAR, and transparent filter) at a post-mined peatland, Sarobetsu Mire, in 2008. In this field, Rhynchospora alba and Moliniopsis japonica are dominant. By the previous studies, we recognized that R.alba is an early colonizer on the bare ground, and M.japonica colonized later. I transplanted the seedlings of the two species after growing in a greenhouse, and observed the effects of solar UV. I focused on 1) interactive effects of UVA, UVB and PAR, 2) the UV effects on the plants growth and succession.

In this seminar, I will introduce four previous reports that suggested the effects of UV on plants with using various materials and methods.

Papers to be reviewd
  1. Jennifer L. Smith, David J. Burritt and Peter Bannister, Shoot dry weight, chlorophyll and UV-B-absorbing compounds as indicators of a plant's sensitivity to UV-B radiation, Annals of Botany (2000), 86: 1057-1063 (url)
  2. G.H.Krause, O.Y.Koroleva, J.W.Dalling and K.Winter,Acclimation of tropical tree seedlings to excessive light in simulated tree-fall gaps, Plant, Cell and Environment(2001)24:1345-1352 (url)
  3. M. Cecillia Rousseaux, Stephan D. Flint, Peter s. Searles and Martyn M. Caldwell, Plant Responses to Current Solar Ultraviolet-B Radiation and to Supplemented Solar Ultraviolet-B Radiation Simulating Ozone Depletion: An Experimental Comparison, Photochemistry and Photobiology (2004), 80: 224-230 (url)
  4. Martyn M. Caldwell, Carlos L. Ballare, Janet F. Bornman, Stephan D. Flint, Lars Olof Bjorn, Alan H. Teramura, G.. Kulandaivelu and Manfred Tevini, Terrestrial ecosystems, increased solar ultraviolet radiation and interactions with other climatic change factors, Photochemical and Photobiological Sciences (2003), 2: 29-38 (url)

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