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Signaling by mannose in Arabidopsis thaliana and its integration with energy metabolism and responses to stress

Grant number: 08/10917-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): April 01, 2009
Effective date (End): October 31, 2012
Field of knowledge:Biological Sciences - Genetics - Plant Genetics
Principal researcher:Michel Georges Albert Vincentz
Grantee:Juliana Cristina Baptista
Home Institution: Centro de Biologia Molecular e Engenharia Genética (CBMEG). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The adaptation of plants to different changes ahead of the environment is made by a complex network of genes that control different reactions to the conditions of stress. In plants, sugars and metabolic function as a source as important regulators of various processes associated with growth, maturation and senescence. Its activities include both the regulatory repression, as the activation of several genes, including genes involved in photosynthesis, metabolism of carbon and nitrogen, responses to stress, secondary metabolism, as well as possible involvement in the various mechanisms of sensitivity and transduction. We show that in Arabidopsis thaliana mannose, a similar structural hexose of glucose, acts as a signal independent of glucose in controlling the expression of genes AtbZIP25 and AtbZIP63, which encode transcription factor type bZIP. The mannose is the precursor of vitamin C, a molecule essential for the control of oxidative stress, and is also required for assembly of the cell wall and glycosylation of proteins. Despite the apparent importance of mannose in plant cells, almost no information related to its signaling and / or regulatory network is available. The project aims to contribute to unravel presented the role of mannose in angiosperms using Arabidopsis thaliana as a model.

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