Logo des Forschungsinformationssystems Agrar und Ernährung

Forschungsinformationssystem Agrar und Ernährung

Informationsportal des Bundes und der Länder

FOR 948 P10: Senescence and ammonium homeostasis in source and sink organs



Dieses Projekt leistet einen Beitrag zum Forschungsziel „Produktionsverfahren“. Welche Förderer sind dazu aktiv? Welche Teilziele gibt es dazu? Schauen Sie nach:

Förderkennzeichen: DFG FOR 948
Laufzeit: 01.01.2009 - 31.12.2010
Forschungszweck: Grundlagenforschung

Ammonium is a central intermediate in plant nitrogen metabolism and in particular during plant senescence ammonium is generated and re-assimilated at high rate. Imbalance in ammonium handling may lead to growth impairment and ammonia volatilization from the leaves. The overall aim of the project is to study bottle-necks in efficient ammonium assimilation and compartmentalisation in senescing source leaves and generative sinks. A range of experiments will be conducted using mutants and transgenic lines in Arabidopsis, barley and oilseed rape to reveal the specific roles of isoforms of the key assimilatory enzyme glutamine synthetase and the ammonia-channelling tonoplast intrinsin proteins for NH4+ homeostasis. Furthermore, implications of imbalances in NH4+ homeostasis for nitrogen re-mobilization from senescing leaves and plant-atmosphere ammonia exchange will be investigated. The knowledge gained will result in validation of candidate genes controlling nitrogen use efficiency which can be used to develop genetic markers for breeding of cultivars with improved nutrient use. In an agronomic perspective, the results obtained are expected to provide an improved basis for development of new and better nitrogen application strategies allowing more intensive use of foliar fertilizers.

mehr anzeigen weniger anzeigen


Ausführende Einrichtung

Sektion Pflanze und Boden

Erweiterte Suche