期刊
PLANT CELL AND ENVIRONMENT
卷 32, 期 11, 页码 1573-1583出版社
WILEY
DOI: 10.1111/j.1365-3040.2009.02021.x
关键词
Arabidopsis; action spectrum; DNA repair; fluence response; growth inhibition; hypocotyl elongation; photoreceptor; reciprocity; ultraviolet light; UV-B
资金
- Minnesota Agricultural Experiment Station
- University of Minnesota Undergraduate Opportunities Program
Alteration of 'normal' levels of ultraviolet-B light (UV-B, 280-320 nm) can affect plant chemical composition as well as growth; however, little is known about how plants perceive UV-B light. We have carried out fluence response curves, and demonstrated that the growth inhibition of etiolated Arabidopsis thaliana seedlings by low fluence UV light is specific to UV-B and not UV-A (320-390 nm). The response shows reciprocity between duration and intensity, at least over a limited range, and thus depends only on photon fluence and not on photon flux. The action spectrum for this response indicates a peak of maximum effectiveness at 290 nm, and response spectra at different fluences indicate that the most effective wavelength at 30 000 mu mol m-2 is 290 nm, whereas 300 nm light was the most effective at 100 000 mu mol m-2. This response occurs in mutant seedlings deficient in cryptochrome, phytochrome or phototropin, suggesting that none of the known photoreceptors is the major UV-B photoreceptor. Some null mutants in DNA repair enzymes show hypersensitivity to UV-B, suggesting that even at low fluence rates, direct damage to DNA may be one component of the response to UV-B.
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