Clinorotation effect on thermodynamic efficiency of energy transformation in chloroplasts of higher plants.
The aim of the work was to estimate the effect of clinorotation on thermodynamic coupling and efficiency of the process of photosynthetic energy transformation in chloroplasts using nonequilibrium thermodynamics approach. These parameters were calculated from experimentally determined net photosynthetic oxygen evolution at static head [(Je)sh], uncoupled rate of the oxygen evolution (Jo)unc and net rate of ATP production. It was found that in chloroplasts isolated from control and clinorotated pea plants coefficient of thermodynamic coupling of photophosphorylation (q) was 0.94 and 0.91 respectively. Optimal thermodynamic efficiency (eta opt) of the systems were calculated as 0.64 and 0.6 for control and clinorotation plants. Thus the data of the work show that thermodynamic efficiency of light energy transformation in higher plants is under influence of imitated weightlessness conditions.
Zolotareva
E K
EK
Institute of Botany, Kyiv, Ukraine. membrana@ukr.net
Podorvanov
V V
VV
D000255:Adenosine Triphosphate / Q000378:metabolism; D017301:Ca(2+) Mg(2+)-ATPase / Q000378:metabolism; D002736:Chloroplasts / Q000378:metabolism* / Q000528:radiation effects; D008027:Light; D010100:Oxygen / Q000378:metabolism*; D018532:Pisum sativum / Q000378:metabolism / Q000528:radiation effects; D010788:Photosynthesis / Q000502:physiology*; D018515:Plant Leaves / Q000166:cytology; D012399:Rotation; D013816:Thermodynamics; D018474:Weightlessness Simulation
D000255:Adenosine Triphosphate; D017301:Ca(2+) Mg(2+)-ATPase; D010100:Oxygen