Erweiterte Suche

Expression of several genes encoding transcription factors (TFs) of the so-called NAC family have been found to be induced during senescence of leaves in Arabidopsis thaliana and other plants, including crops. Up to date, however, the knowledge about the functional role of NAC TFs with respect to the control of senescence processes is limited. Here we propose to analyse the regulatory functions...

Förderzeitraum: 2009 - 2010

Relevanz: 100%

FOR 948 P3: Degradation of chloroplast proteins- involvement of senescence associated vacuoles and cysteine proteases (Projekt)

The major fraction of proteins to be degraded during senescence resides in chloroplasts. So far, the proteases responsible for mass protein degradation during senescence have not been identified. It is hypothesized that cysteine proteases outside of chloroplasts are involved in degradation of chloroplast proteins and that these cysteine proteases are located in small vacuoles appearing in the...

Förderzeitraum: 2009 - 2010

Relevanz: 100%

FOR 948 P4: Nitrogen deficiency and senescence in Arabidopsis and oilseed rape: Transcriptome response and the role of peptide transporters (Projekt)

Nitrogen use efficiency of oilseed rape is rather low. One factor contributing to this inefficiency is a lack of temporal linkage between initiation of true-leaf senescence and the development of the reproductive organs. The advanced understanding of nitrogen remobilization and allocation mechanisms in oilseed rape and its close relative Arabidopsis during nitrogen starvation and developmental...

Förderzeitraum: 2009 - 2010

Relevanz: 100%

FOR 948 P5: Forms of retranslocated nitrogen during leaf senescence and nitrogen deficiency (Projekt)

Nitrogen retranslocation from senescing leaves to the grains is one of the limiting factors for an efficient recovery of fertilizer nitrogen supplied to crop plants. Although molecular and physiological approaches have described enzymes, transporters and nitrogenous compounds available for nitrogen retranslocation, experimental evidence on the significance and efficiency of different nitrogen...

Förderzeitraum: 2009 - 2010

Relevanz: 100%

FOR 948 P6: Relation between metabolic control of leaf senescence by carbohydrates and nitrogen metabolism (Projekt)

Although leaf senescence has been shown to be accompanied by changes in carbohydrate composition and levels, the role of sugars in the initiation and regulation of senescence is a matter of debate. The hydrolysis of the transported sugar sucrose by an extracellular invertase is a key step in regulating phloem unloading. Based on the finding that an extracellular invertase is essential for...

Förderzeitraum: 2009 - 2010

Relevanz: 100%

FOR 948 P7: Senescence and nitrogen remobilization at plant level as affected by carbon and nitrogen source variation (Projekt)

Atmospheric carbon dioxide enrichment has been shown to reduce nitrogen concentrations in green tissues of C3 species via optimisation of nitrogen allocation within the photosynthetic apparatus with less investment in ribulose-1,5-bisphosphate-carboxylase/oxygenase (RubisCO) and the photorespiratory pathway. This leads to changed patterns of nitrogen redistribution as well as nitrogen...

Förderzeitraum: 2009 - 2010

Relevanz: 100%

FOR 948 P8: Relationship between senescence-induced N remobilisation and seed filling in barley (Projekt)

High yield and grain quality can only be achieved at optimum supply of the growing seed with carbon and nitrogen assimilates. In barley the ear-near photosynthesising organs, flag leaf, glumes and awn, are most important for supplying the growing grain. During plant senescence C and N compounds are mobilised from these organs and transported to the filling grain. Therefore, understanding the...

Förderzeitraum: 2009 - 2010

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Forschungsinformationssystem Agrar und Ernährung