Acclimation of photosynthesis to nitrogen deficiency in Phaseolus vulgaris.

Planta
T K AntalEsa Tyystjärvi

Abstract

Nitrogen deficiency diminishes consumption of photosynthates in anabolic metabolism. We studied adjustments of the photosynthetic machinery in nitrogen-deficient bean plants and found four phenomena. First, the number of chloroplasts per cell decreased. Chloroplasts of nitrogen starved leaves contained less pigments than those of control leaves, but the in vitro activities of light reactions did not change when measured on chlorophyll basis. Second, nitrogen deficiency induced cyclic electron transfer. The amounts of Rubisco and ferredoxin-NADP(+) reductase decreased in nitrogen starved plants. Low activities of these enzymes are expected to lead to increase in reduction of oxygen by photosystem I. However, diaminobenzidine staining did not reveal hydrogen peroxide production in nitrogen starved plants. Measurements of far-red-light-induced redox changes of the primary donor of photosystem I suggested that instead of producing oxygen radicals, nitrogen starved plants develop a high activity of cyclic electron transport that competes with oxygen for electrons. Nitrogen starvation led to decrease in photochemical quenching and increase in non-photochemical quenching, indicating that cyclic electron transport reduces the plastoqui...Continue Reading

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Citations

Sep 30, 2010·Applied Microbiology and Biotechnology·Taras K AntalAndrew B Rubin
Dec 21, 2010·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Peter BucheliJunkuan Wang
Dec 20, 2011·Journal of Plant Physiology·María del Mar Rubio-WilhelmiJuan Manuel Ruiz
May 20, 2015·Photosynthesis Research·Taras K AntalEsa Tyystjärvi
Jul 16, 2013·Plant Science : an International Journal of Experimental Plant Biology·Jeffrey J FischerDouglas G Muench
Mar 29, 2014·Photosynthesis Research·Alexandra Dubini, Maria L Ghirardi
Aug 11, 2020·Journal of Experimental Botany·Dawei SunHaiyan Cen
Apr 28, 2017·Scientific Reports·Pasquale L CurciGabriella Sonnante
Nov 1, 2011·Functional Plant Biology : FPB·Constantinos Nikiforou, Yiannis Manetas

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