Effect of reduction of the light collecting complex on the size of the photosynthetic unit and the number of reaction centres of photosystems in chlamydomonas reinhardii mutants

V. G. Ladygin, Suleyman Allakhverdiev, A. G. Chetverikov

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13 Citations (Scopus)

Abstract

The values of the photosynthetic units and the numbers of reaction centres (r.c.) of photosystem I (p.s.-I) and photosystem II (p.s.-II) calculated from the photoinduced changes in the absorption of pheophytin, P680 and P700 and also the e.s.r. signals I and II have been investigated. It was established that in the course of reduction of the light collecting complex (l.c.c.) in the mutants the size of the photosynthetic unit falls and amounts per r.c. of p.s.-I to about 120±20 and of p.s.-II to 50±10 chlorphyll a molecules. On conversion to 1 mg of chlorophyll the number of r.c. in the mutants containing p.s.-I rises 5 fold and p.s.-II 10-20 fold. It is concluded that the mutants ACC-11, ACC-14 and ACC-42 as well as p.s.-I contain part of the l.c.c., while the mutants ACC-66, ACC-98, ACC-100 and ACC-238 form only the p.s.-II complex. Regardless of the degree of reduction of the l.c.c. the number of r.c. of the photosystems in the chloroplasts of the mutants does not change significantly.

Original languageEnglish
Pages (from-to)280-285
Number of pages6
JournalBiophysics
Volume35
Issue number2
Publication statusPublished - Dec 1 1990
Externally publishedYes

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Photosystem I Protein Complex
Chlamydomonas reinhardtii
Photosystem II Protein Complex
Light
Pheophytins
Chloroplasts
Chlorophyll

ASJC Scopus subject areas

  • Biophysics

Cite this

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title = "Effect of reduction of the light collecting complex on the size of the photosynthetic unit and the number of reaction centres of photosystems in chlamydomonas reinhardii mutants",
abstract = "The values of the photosynthetic units and the numbers of reaction centres (r.c.) of photosystem I (p.s.-I) and photosystem II (p.s.-II) calculated from the photoinduced changes in the absorption of pheophytin, P680 and P700 and also the e.s.r. signals I and II have been investigated. It was established that in the course of reduction of the light collecting complex (l.c.c.) in the mutants the size of the photosynthetic unit falls and amounts per r.c. of p.s.-I to about 120±20 and of p.s.-II to 50±10 chlorphyll a molecules. On conversion to 1 mg of chlorophyll the number of r.c. in the mutants containing p.s.-I rises 5 fold and p.s.-II 10-20 fold. It is concluded that the mutants ACC-11, ACC-14 and ACC-42 as well as p.s.-I contain part of the l.c.c., while the mutants ACC-66, ACC-98, ACC-100 and ACC-238 form only the p.s.-II complex. Regardless of the degree of reduction of the l.c.c. the number of r.c. of the photosystems in the chloroplasts of the mutants does not change significantly.",
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AU - Allakhverdiev, Suleyman

AU - Chetverikov, A. G.

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AB - The values of the photosynthetic units and the numbers of reaction centres (r.c.) of photosystem I (p.s.-I) and photosystem II (p.s.-II) calculated from the photoinduced changes in the absorption of pheophytin, P680 and P700 and also the e.s.r. signals I and II have been investigated. It was established that in the course of reduction of the light collecting complex (l.c.c.) in the mutants the size of the photosynthetic unit falls and amounts per r.c. of p.s.-I to about 120±20 and of p.s.-II to 50±10 chlorphyll a molecules. On conversion to 1 mg of chlorophyll the number of r.c. in the mutants containing p.s.-I rises 5 fold and p.s.-II 10-20 fold. It is concluded that the mutants ACC-11, ACC-14 and ACC-42 as well as p.s.-I contain part of the l.c.c., while the mutants ACC-66, ACC-98, ACC-100 and ACC-238 form only the p.s.-II complex. Regardless of the degree of reduction of the l.c.c. the number of r.c. of the photosystems in the chloroplasts of the mutants does not change significantly.

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