NDLI: Increase in the rate of photosynthetic linear electron transport in cyanobacteruim Synechocystis sp. PCC 6803 lacking phycobilisomes

Content Provider	Springer Nature Link
Author	Stadnichuk, I. N. Lukashev, E. P. Elanskaya, I. V. Boichenko, V. A. Bukhov, N. G.
Copyright Year	2009
Abstract	Compensating changes in the pigment apparatus of photosynthesis that resulted from a complete loss of phycobilisomes (PBS) were investigated in the cells of a PAL mutant of cyanobacterium Synechocystis sp. PCC 6803. The ratio PBS/chlorophyll calculated on the basis of the intensity of bands in the action spectra of photosynthetic activity of two photosystems in the wild strain was 1: 70 for PSII and 1: 300 for PSI. Taking into consideration the number of chlorophyll molecules per reaction center in each photosystem, these ratios could be interpreted as association of PBS with dimers of PSII and trimers of PSI as well as greater dependence of PSII as compared with PSI on light absorption by PBS. The ratio PSI/PSII determined by photochemical cross-section of the reactions of two photosystems was 3.5: 1.0 for wild strain of Synechocystis sp. PCC 6803 and 0.7: 1.0 for the PAL mutant. A fivefold increase in the relative content of PSII in pigment apparatus corresponds to a 5-fold increase in the intensity of bands at 685 and 695 nm as related to the band of PSI at 726 nm recorded in low-temperature fluorescence spectrum of the PAL mutant. Inhibition of PSII with diuron resulted in a pronounced stimulation of chlorophyll fluorescence in the PAL mutant as compared to the wild strain of Synechocystis sp. PCC 6803; these data suggested an activation of electron transfer between PSII and PSI in the mutant cells. Thus, the lack of PBS in the mutant strain of Synechocystis sp. PCC 6803 was compensated for by the higher relative content of PSII in the pigment apparatus of photosynthesis and by a rise in the rate of linear electron transport.
Starting Page	439
Ending Page	444
Page Count	6
File Format	PDF
ISSN	10214437
Journal	Russian Journal of Plant Physiology
Volume Number	56
Issue Number	4
e-ISSN	16083407
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2009-06-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Synechocystis 6803 PSI PSII phycobilisomes Plant Sciences Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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