Premium
Effect of CO 2 on the energization of thylakoids in leaves of higher plants
Author(s) -
Garab Gy.,
Burgos A.A.Sanchez,
Zimányi L.,
Faludi-Dániel Á.
Publication year - 1983
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(83)80175-6
Subject(s) - electrochromism , absorbance , thylakoid , photosystem , electron transport chain , chemistry , analytical chemistry (journal) , chloroplast , photochemistry , biophysics , photosynthesis , photosystem ii , biology , biochemistry , chromatography , electrode , gene
We investigated the effect of CO 2 on the flash‐induced electrochromic absorbance change of chloroplasts in leaves of higher plants. In leaves depleted of CO 2 the initial electrochromic rise was followed by a fast ( t 10–20 ms) and a slow (100–200 ms) decay. These kinetic components could be correlated with a dissipative and an ATP‐synthetizing current, respectively. In leaves supplied with CO 2 an additional slow electrochromic rise (5–10 ms) appeared in the absorbance change. This component could be tentatively correlated with the enhancement of the electron transport by CO 2 between the two photosystems. In leaves supplied with CO 2 the decay could be fitted with a single exponential with a t ≈200 ms. We conclude that both energization and ATP‐synthesis are strongly regulated by CO 2 in chloroplasts in situ.