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The Impacts of Phosphorus Deficiency on the Photosynthetic Electron Transport Chain.

Journal article
Authors Andreas Carstensen
Andrei Herdean
Sidsel Birkelund Schmidt
Anurag Sharma
Cornelia Spetea
Mathias Pribil
Søren Husted
Published in Plant physiology
Volume 177
Issue 1
Pages 271-284
ISSN 1532-2548
Publication year 2018
Published at Department of Biological and Environmental Sciences
Pages 271-284
Language en
Links dx.doi.org/10.1104/pp.17.01624
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Botany, Cell Biology

Abstract

Phosphorus (P) is an essential macronutrient, and P deficiency limits plant productivity. Recent work showed that P deficiency affects electron transport to photosystem I (PSI), but the underlying mechanisms are unknown. Here, we present a comprehensive biological model describing how P deficiency disrupts the photosynthetic machinery and the electron transport chain through a series of sequential events in barley (Hordeum vulgare). P deficiency reduces the orthophosphate concentration in the chloroplast stroma to levels that inhibit ATP synthase activity. Consequently, protons accumulate in the thylakoids and cause lumen acidification, which inhibits linear electron flow. Limited plastoquinol oxidation retards electron transport to the cytochrome b6f complex, yet the electron transfer rate of PSI is increased under steady-state growth light and is limited under high-light conditions. Under P deficiency, the enhanced electron flow through PSI increases the levels of NADPH, whereas ATP production remains restricted and, hence, reduces CO2 fixation. In parallel, lumen acidification activates the energy-dependent quenching component of the nonphotochemical quenching mechanism and prevents the overexcitation of photosystem II and damage to the leaf tissue. Consequently, plants can be severely affected by P deficiency for weeks without displaying any visual leaf symptoms. All of the processes in the photosynthetic machinery influenced by P deficiency appear to be fully reversible and can be restored in less than 60 min after resupply of orthophosphate to the leaf tissue.

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