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

• Published in: Plant physiology (Bethesda) Vol. 103; no. 2; pp. 649 - 660
• Main Authors: Harbinson, J, Hedley, C.L
• Format: Journal Article
• Language: English
• Published: Rockville, MD American Society of Plant Physiologists 01.10.1993
• 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; Electron flux; Chlorophyll; Reaction center; Early phase; Carbon dioxide; Fluorescence; Plant leaf; Metabolism; Photosystem 1; Grain legume; Leguminosae; Dicotyledones; Light; Pisum sativum; Angiospermae; Spermatophyta; Oxidation; Biological accumulation; Photosynthesis
• ISSN: 0032-0889; 1532-2548
• DOI: 10.1104/pp.103.2.649

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