Abstract
Photoreduction of Pheophytin 'a' (Pheo) accompanied by a decrease in the chlorophyll fluorescence yield is observed in photosystem II (PS II) of the whole cells of green algae Chlamydomonas reinhardii (a wild type and a mutant lacking both photosystem I and chlorophyll 'b'), Chlorella pyrenoidosa, Scenedesmus obliquus and cyanobacteria Phormidium laminosum, Anabaena variabilis and Cynechococcus elongatus under anaerobic conditions created by means of the glucose-glucoseoxidase-catalase. The photoreaction is activated by the addition of 1 μM CCCP, inhibited by 10 μM DCMU and reactivated upon subsequent addition of either ascorbate or dithionite. Oxidized NADP, benzyl viologen and methyl viologen accelerate dark oxidation of the reduced Pheo indicating that they are able to accept an electron from {Mathematical expression} in PS II. The data on both photoreduction of Pheo in the intact cells in the absence of exogenous reductants, when electron donation to reaction centers of PS II occurs only from water, and the inhibition of this photoreaction by DCMU, show that the Pheo photoreduction is sensitized by the reaction centers of PS II and probably occurs as a result of the electron donation from the water-splitting system being in the state S3, to {Mathematical expression} producing the long-lived state {Mathematical expression} and O2.
| Original language | English |
|---|---|
| Pages (from-to) | 355-363 |
| Number of pages | 9 |
| Journal | Photosynthesis Research |
| Volume | 10 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Jan 1 1986 |
| Externally published | Yes |
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Keywords
- NADP reduction (Algae cells)
- Pheophytin
- Photosystem II
- Reaction center
- Water splitting
ASJC Scopus subject areas
- Biochemistry
- Plant Science
- Cell Biology
Cite this
Photoreduction of pheophytin in photosystem II of the whole cells of green algae and cyanobacteria. / Klimov, V. V.; Allakhverdiev, Suleyman; Ladygin, V. G.
In: Photosynthesis Research, Vol. 10, No. 3, 01.01.1986, p. 355-363.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Photoreduction of pheophytin in photosystem II of the whole cells of green algae and cyanobacteria
AU - Klimov, V. V.
AU - Allakhverdiev, Suleyman
AU - Ladygin, V. G.
PY - 1986/1/1
Y1 - 1986/1/1
N2 - Photoreduction of Pheophytin 'a' (Pheo) accompanied by a decrease in the chlorophyll fluorescence yield is observed in photosystem II (PS II) of the whole cells of green algae Chlamydomonas reinhardii (a wild type and a mutant lacking both photosystem I and chlorophyll 'b'), Chlorella pyrenoidosa, Scenedesmus obliquus and cyanobacteria Phormidium laminosum, Anabaena variabilis and Cynechococcus elongatus under anaerobic conditions created by means of the glucose-glucoseoxidase-catalase. The photoreaction is activated by the addition of 1 μM CCCP, inhibited by 10 μM DCMU and reactivated upon subsequent addition of either ascorbate or dithionite. Oxidized NADP, benzyl viologen and methyl viologen accelerate dark oxidation of the reduced Pheo indicating that they are able to accept an electron from {Mathematical expression} in PS II. The data on both photoreduction of Pheo in the intact cells in the absence of exogenous reductants, when electron donation to reaction centers of PS II occurs only from water, and the inhibition of this photoreaction by DCMU, show that the Pheo photoreduction is sensitized by the reaction centers of PS II and probably occurs as a result of the electron donation from the water-splitting system being in the state S3, to {Mathematical expression} producing the long-lived state {Mathematical expression} and O2.
AB - Photoreduction of Pheophytin 'a' (Pheo) accompanied by a decrease in the chlorophyll fluorescence yield is observed in photosystem II (PS II) of the whole cells of green algae Chlamydomonas reinhardii (a wild type and a mutant lacking both photosystem I and chlorophyll 'b'), Chlorella pyrenoidosa, Scenedesmus obliquus and cyanobacteria Phormidium laminosum, Anabaena variabilis and Cynechococcus elongatus under anaerobic conditions created by means of the glucose-glucoseoxidase-catalase. The photoreaction is activated by the addition of 1 μM CCCP, inhibited by 10 μM DCMU and reactivated upon subsequent addition of either ascorbate or dithionite. Oxidized NADP, benzyl viologen and methyl viologen accelerate dark oxidation of the reduced Pheo indicating that they are able to accept an electron from {Mathematical expression} in PS II. The data on both photoreduction of Pheo in the intact cells in the absence of exogenous reductants, when electron donation to reaction centers of PS II occurs only from water, and the inhibition of this photoreaction by DCMU, show that the Pheo photoreduction is sensitized by the reaction centers of PS II and probably occurs as a result of the electron donation from the water-splitting system being in the state S3, to {Mathematical expression} producing the long-lived state {Mathematical expression} and O2.
KW - NADP reduction (Algae cells)
KW - Pheophytin
KW - Photosystem II
KW - Reaction center
KW - Water splitting
UR - http://www.scopus.com/inward/record.url?scp=0011599493&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0011599493&partnerID=8YFLogxK
U2 - 10.1007/BF00118301
DO - 10.1007/BF00118301
M3 - Article
AN - SCOPUS:0011599493
VL - 10
SP - 355
EP - 363
JO - Photosynthesis Research
JF - Photosynthesis Research
SN - 0166-8595
IS - 3
ER -