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''Plant resource management: the central kinase SnRK1 acts as a regulator of seedling establishment and root plasticity''

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Thursday 06 February 2020, 11:00 - 12:30

 
ABSTRACT

Sustaining energy homeostasis is crucial to every living being. To balance energy supply and demand, plants make use of an evolutionarily conserved managing system consisting of two counteracting kinases: TOR (TARGET OF RAPAMYCIN) supports anabolic, energy-consuming metabolism, whereas SnRK1 (Snf1-RELATED PROTEIN KINASE1) activates catabolic, energy-preserving responses. Our previous work has established SnRK1 in controlling alternative energy pathways to survive low energy stress. Here, we focus on SnRK1 function during developmental processes: (1) Combined transcriptome and metabolite analyses defined SnRK1 as a major metabolic regulator of lipid, amino acid and carbohydrate catabolism during seedling establishment. In this context, we identified SnRK1 regulated target genes controlling resource mobilization. Exemplified for the PPDK (PYRUVATE PHOSPHATE DIKINASE) gene, encoding a central bottle neck enzyme in amino acid catabolism, we studied transcriptional regulation mediated by the SnRK1 kinase. (2) To assess the impact of limiting energy supply on developmental outputs, we established assays to study changes in lateral root plasticity upon transient perturbations in photosynthesis. In this respect, we link SnRK1-dependent energy signalling to transcriptional induction of ARF19 (AUXIN RESPONSE FACTOR19), a central transcription factor in lateral root development. Taken together, these studies provide molecular insight how plants transmit information on energy availability into developmental programs.

 

Location Jozef Schell Seminar Room
Contact Prof Wolfgang Dröge-Laser
Julius-von-Sachs-Institute
University of Würzburg
Würzburg
GERMANY