Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
Volume 100, Issue 3, Pages 117-122Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2010.05.010
Keywords
Gracilaria lemaneiformis; Growth; Photochemical efficiency; Photosynthetic pigments; UV; UV-absorbing compounds
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Funding
- National Basic Research Program of China [2009CB421207]
- National Natural Science Foundation [40930846]
- 863 Project [2006AA10A413]
- Ministry of Education of China [308015]
- Huaihai Institute of Technology [Z2009045]
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The effects of solar UV radiation (280-400 nm) on growth, quantum yield and pigmentation in Gracilaria lemaneiformis were investigated when the thalli were cultured under solar radiation with or without UV for a period of 15 days. Presence of UV-A(315-400 nm) enhanced the relative growth rate, while UV-B (218-315 nm) inhibited it. The positive effect of UV-A and negative effect of UV-B counteracted to result in an insignificant impact of UVR on growth. During the noon period, both UV-A and UV-B resulted in the decrease of maximum quantum yield (Fv/Fm), but UV-B aided in the recovery of the yield in the late afternoon, reflecting that UV-B might be used as a signal in photorepair processes. UV induced the accumulation of UV-absorbing compounds (UVAC) to defend against the harmful UVR. However, the accumulation of UVAC took a much longer time compared to that previously reported, which was probably due to the lower levels of solar radiation and water temperature in the early spring period. Unknown UV-absorbing compounds (UVAC), which peaked at 265 nm, probably the precursor of MAAs (UVAC(325)), accumulated under moderate levels of solar radiation and were transformed to MAAs under higher solar radiation. (C) 2010 Elsevier B.V. All rights reserved.
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