Effect of CO2 on the energization of thylakoids in leaves of higher plants

FEBS Letters

Faludi-Dániel, Á.¹  Garab, Gy.¹  Zimányi, L.²  Burgos, A.A.Sanchez¹ 

[1] Institute of Plant Physiology, Hungarian Academy of Sciences, Szeged, PO Box 521, H-6701 Hungary;Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences, Szeged, PO Box 521, H-6701 Hungary

关键词: Photosynthesis;    Chloroplast;    Electrochromism;    CO2;    Energization;    DCMU;    3-(3;    4-dichlorophenyl)-1;    1-dimethylurea;   

DOI  :  10.1016/0014-5793(83)80175-6

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

We investigated the effect of CO₂ on the flash-induced electrochromic absorbance change of chloroplasts in leaves of higher plants. In leaves depleted of CO₂ 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 CO₂ 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 CO₂ between the two photosystems. In leaves supplied with CO₂ 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 CO₂ in chloroplasts in situ.

【 授权许可】

Unknown