C
Christof Engels
Researcher at University of Hohenheim
Publications - 23
Citations - 1721
Christof Engels is an academic researcher from University of Hohenheim. The author has contributed to research in topics: Shoot & Nitrate. The author has an hindex of 17, co-authored 23 publications receiving 1592 citations. Previous affiliations of Christof Engels include University of Bayreuth.
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Journal ArticleDOI
Rapid effects of nitrogen form on leaf morphogenesis in tobacco
TL;DR: It seems likely that the presence of NO3- is required to maintain biosynthesis and/or root to shoot transfer of cytokinins at a level that is sufficient to mediate normal leaf morphogenesis.
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Differential regulation of three functional ammonium transporter genes by nitrogen in root hairs and by light in leaves of tomato.
N. von Wirén,Frank-Roman Lauter,Olaf Ninnemann,Bernd Gillissen,Pia Walch-Liu,Christof Engels,W. Jost,Wolf B. Frommer +7 more
TL;DR: Results indicate that in tomato at least two high-affinity NH4+ transporters, LeAMT1;1 and LeAMt1;2, are differentially regulated by N and contribute to root hair-mediated NH4 + acquisition from the rhizosphere.
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Enhanced carbon dioxide leads to a modified diurnal rhythm of nitrate reductase activity in older plants, and a large stimulation of nitrate reductase activity and higher levels of amino acids in young tobacco plants
Michael Geiger,Pia Walch-Liu,Christof Engels,J. Harnecker,Ernst Detlef Schulze,Frank Ludewig,Uwe Sonnewald,Wolf-Rüdiger Scheible,Mark Stitt +8 more
TL;DR: In this article, the authors investigated the effect of carbon dioxide on the diurnal regulation of NR activity in source leaves and found that enhanced carbon dioxide did not increase leaf NR activity, but rather reduced it in the middle of the photoperiod.
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Elevated carbon dioxide increases nitrate uptake and nitrate reductase activity when tobacco is growing on nitrate, but increases ammonium uptake and inhibits nitrate reductase activity when tobacco is growing on ammonium nitrate
TL;DR: In this paper, the influence of elevated CO2 on the uptake and assimilation of nitrate and ammonium was investigated by growing tobacco plants in hydroponic culture with 2mm nitrate or 1mm ammonium nitrate.
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The immediate cause of the diurnal changes of nitrogen metabolism in leaves of nitrate‐replete tobacco: a major imbalance between the rate of nitrate reduction and the rates of nitrate uptake and ammonium metabolism during the first part of the light period
TL;DR: In this article, the diurnal changes of nitrate reductase (NIA) expression in leaves interact with upstream and downstream processes during nitrate utilization, nitrate uptake, and nitrate and ammonium metabolism.