UV-A/blue light-induced reactivation of spore germination in UV-B irradiated Ulva pertusa (Chlorophyta) SCIE SCOPUS

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Title
UV-A/blue light-induced reactivation of spore germination in UV-B irradiated Ulva pertusa (Chlorophyta)
Author(s)
Han, TJ; Kong, JA; Han, YS; Kang, SH; Hader, DP
Publication Year
2004-04
Abstract
Recent reduction in the ozone shield due to manufactured chlorofluorocarbons raised considerable interest in the ecological and physiological consequences of UV-B radiation (lambda=280-315 nm) in macroalgae. However, early life stages of macroalgae have received little attention in regard to their UV-B sensitivity and UV-B defensive mechanisms. Germination of UV-B irradiated spores of the intertidal green alga Ulva pertusa Kjellman was significantly lower than in unexposed controls, and the degree of reduction correlated with the UV doses. After exposure to moderate levels of UV-B irradiation, subsequent exposure to visible light caused differential germination in an irradiance- and wavelength-dependent manner. Significantly higher germination was found at higher photon irradiances and in blue light compared with white and red light. The action spectrum for photoreactivation of germination in UV-B irradiated U. pertusa spores shows a major peak at 435 nm with a smaller but significant peak at 385 nm. When exposed to December sunlight, the germination percentage of U. pertusa spores exposed to 1 h of solar radiation reached 100% regardless of the irradiation treatment conditions. After a 2-h exposure to sunlight, however, there was complete inhibition of germination in PAR+UV-A+UV-B in contrast to 100% germination in PAR or PAR+UV-A. In addition to mat-forming characteristics that would act as a selective UV-B filter for settled spores under the parental canopy, light-driven repair of germination after UV-B exposure could explain successful continuation of U. pertusa spore germination in intertidal settings possibly affected by intense solar UV-B radiation.
ISSN
0022-3646
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5268
DOI
10.1111/j.1529-8817.2004.03069.x
Bibliographic Citation
JOURNAL OF PHYCOLOGY, v.40, no.2, pp.315 - 322, 2004
Publisher
BLACKWELL PUBLISHING INC
Subject
INDUCED DNA-DAMAGE; ULTRAVIOLET-RADIATION; LAMINARIA-SACCHARINA; PHOTOSYNTHETIC PERFORMANCE; YOUNG SPOROPHYTES; ARCTIC MACROALGAE; DEPTH-ZONATION; PHOTOREACTIVATION; GROWTH; BLUE
Keywords
blue light; germination; photoreactivation; spore; Ulva pertusa; UV-B (lambda=280-315 nm)
Type
Article
Language
English
Document Type
Article
Publisher
BLACKWELL PUBLISHING INC
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