This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Satoh, K. Articles by Fork, D. C. Search for Related Content PubMed PubMed Citation Articles by Satoh, K. Articles by Fork, D. C. Agricola Articles by Satoh, K. Articles by Fork, D. C.

Articles

Effects of Salinity on Primary Processes of Photosynthesis in the Red Alga Porphyra perforata¹

Carnegie Institution of Washington, Stanford, California 94305, Department of Plant Biology, Stanford, California 94305

The effects of salinity on the primary processes of photosynthesis were studied in the red alga Porphyra perforata. The results show that there are at least three sites in the photosynthetic apparatus of this alga that were affected by increased salinity. The first site, photoactivation and dark-inactivation of electron flow on the reducing side of photosystem I, was completely inhibited at high salinity. The second site, electron flow on the oxidizing side (water side) of photosystem II, was inhibited as was the re-oxidation of Q in the presence of 3-(3,4-dichlorophenyl)-1,1-dimethylurea. The third site affected by high salinity was the transfer of light energy probably from pigment system II to I. High salinity reduced the amount of light energy that reached the reaction centers of photosystem II.

These effects are discussed in relation to the mechanisms available to this plant to avoid photoinhibition when it is exposed to stresses such as high light and high salinity which are conditions that are commonly found in the intertidal habitat.

³ Present address: Hopkins Marine Station, Stanford University Department of Biological Sciences, Pacific Grove, CA 93950.

⁴ To whom correspondence should be addressed.

¹ Carnegie Institution of Washington-Department of Plant Biology Publication No. 812.

This article has been cited by other articles:

				J. A. Cruz, B. A. Salbilla, A. Kanazawa, and D. M. Kramer Inhibition of Plastocyanin to P700+ Electron Transfer in Chlamydomonas reinhardtii by Hyperosmotic Stress Plant Physiology, November 1, 2001; 127(3): 1167 - 1179. [Abstract] [Full Text] [PDF]

				C. Lu and J. Zhang Role of light in the response of PSII photochemistry to salt stress in the cyanobacterium Spirulina platensis J. Exp. Bot., May 1, 2000; 51(346): 911 - 917. [Abstract] [Full Text] [PDF]