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Plant and Cell Physiology, 2004, Vol. 45, No. 5 651-658
© 2004 Oxford University Press

Short Communication

Photosynthetic Electron Transport Controls Expression of the High Light Inducible Gene in the Cyanobacterium Synechococcus elongatus Strain PCC 7942

Kavitha Salem and Lorraine G. van Waasbergen1

Department of Biology and the Converging Biotechnology Center, Box 19498, The University of Texas at Arlington, Arlington, TX 76019, U.S.A.

Abstract

The hliA gene of Synechococcus, encoding a photoprotective high light inducible polypeptide, is up-regulated by high light (HL) or low intensity blue/UV-A light (BL). hliA expression was found to be up-regulated by KCN in low light (LL) (but not in the dark), and up-regulation in HL, BL, and LL (with KCN) was inhibited by 2,5-dibromo-3-methyl-6-isopropyl-benzoquinone. A working hypothesis is proposed whereby up-regulation is in response to the reduced state of cytochrome b6f or a carrier beyond in photosynthesis. Modest up-regulation occurs in LL by treatment with 3-(3,4-dichlorophenyl)-1,1-dimethylurea, but this is related to effects on hliA mRNA stability rather than on transcription.

Footnotes

1 Corresponding author: E-mail, Lorivw{at}uta.edu; Fax, +1-817-272-2855.


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