The Effects of UV Radiation on Chloroplast Clumping and Photosynthesis in the Seagrass Halophila stipulacea Grown under High-PAR Conditions
Joint Authors
Dishon, Gal
Sharon, Yoni
Beer, Sven
Source
Issue
Vol. 2011, Issue 2011 (31 Dec. 2011), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2011-09-22
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Earth Science , Water and Environment
Abstract EN
Since potentially harmful ultraviolet radiation (UVR, 280–400 nm) and high photosynthetically active radiation (PAR, 400–700 nm) are present in the shallow waters of the Gulf of Aqaba where part of the seagrass Halophila stipulacea's population thrives, we examined the effects of high PAR with and without UVR on its photosynthesis and midday chloroplast “clumping phenomenon” (Sharon and Beer 2008).
It was found that midday clumping occurred only under high PAR in the presence of UVR, which resulted in a 44% reduction in the absorption cross section (or absorption factor, AF) of the leaves and, accordingly, a parallel lowering of midday electron transport rates (ETR).
In addition, UVR had a direct effect on the photosynthetic apparatus by lowering quantum yields and, thus, ETRs, while pigment relations remained unaltered.
We conclude that the potentially harmful effects of UVR and high PAR on the photosynthetic apparatus of Halophila stipulacea are mitigated by their activation of chloroplast clumping, which functions as a means of protecting most chloroplasts from high irradiances, including UVR.
American Psychological Association (APA)
Sharon, Yoni& Dishon, Gal& Beer, Sven. 2011. The Effects of UV Radiation on Chloroplast Clumping and Photosynthesis in the Seagrass Halophila stipulacea Grown under High-PAR Conditions. Journal of Marine Sciences،Vol. 2011, no. 2011, pp.1-6.
https://search.emarefa.net/detail/BIM-990918
Modern Language Association (MLA)
Sharon, Yoni…[et al.]. The Effects of UV Radiation on Chloroplast Clumping and Photosynthesis in the Seagrass Halophila stipulacea Grown under High-PAR Conditions. Journal of Marine Sciences No. 2011 (2011), pp.1-6.
https://search.emarefa.net/detail/BIM-990918
American Medical Association (AMA)
Sharon, Yoni& Dishon, Gal& Beer, Sven. The Effects of UV Radiation on Chloroplast Clumping and Photosynthesis in the Seagrass Halophila stipulacea Grown under High-PAR Conditions. Journal of Marine Sciences. 2011. Vol. 2011, no. 2011, pp.1-6.
https://search.emarefa.net/detail/BIM-990918
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-990918