Changes in P-700 oxidation during the early stages of the induction of photosynthesis

Following dark adaptation, the response chlorophyll (Chl) fluorescence, the light-induced absorbance change around 820 nm (to measure reaction center Chl of photosystem I [PSI] P-700 oxidation), and CO2 fixation were examined in pea (pisum sativum L.) leaves under a range of conditions. Initially, P...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1993-10, Vol.103 (2), p.649-660
Main Authors: Harbinson, J, Hedley, C.L
Format: Article
Language:English
Subjects:
ADAPTACION
ADAPTATION
Agronomy. Soil science and plant productions
Biological and medical sciences
CHLOROPHYLLE
Chloroplasts
CLOROFILAS
FEUILLE
Fluorescence
FOSFORO
FOTOSINTESIS
FOTOSISTEMAS
Fundamental and applied biological sciences. Psychology
HOJAS
Irradiance
Kinetics
Leaves
Metabolism
Metabolism and Enzymology
OBSCURIDAD
OBSCURITE
OXIDACION
Oxidation
OXYDATION
Peas
PHOSPHORE
PHOTOSYNTHESE
Photosynthesis
Photosynthesis, respiration. Anabolism, catabolism
PHOTOSYSTEME
PISUM SATIVUM
Plant physiology and development
Plants
PROPIEDADES OPTICAS
PROPRIETE OPTIQUE
Quantum efficiency
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Summary:Following dark adaptation, the response chlorophyll (Chl) fluorescence, the light-induced absorbance change around 820 nm (to measure reaction center Chl of photosystem I [PSI] P-700 oxidation), and CO2 fixation were examined in pea (pisum sativum L.) leaves under a range of conditions. Initially, P-700 oxidation 700 is restricted by a lack of regeneration of PSI electron acceptors, and the increase of oxidized P-700 (P-700+) that occurs during approximately the first 60 s of irradiation is largely independent of the resistance to electron flow between the two photosystems. Under these conditions, the quantum efficiency for linear electron flow is directly positively related to P-700+ accumulation, which is in contrast to the direct negative correlation that is the most frequently reported relationship between P-700+ accumulation and the quantum efficiency for linear electron flow
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.103.2.649