| Grant number: | 16/09699-5 |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| Start date: | September 01, 2016 |
| End date: | August 31, 2019 |
| Field of knowledge: | Biological Sciences - Botany - Pant Physiology |
| Principal Investigator: | Helenice Mercier |
| Grantee: | Ana Zangirólame Gonçalves |
| Host Institution: | Instituto de Biociências (IB). Universidade de São Paulo (USP). São Paulo , SP, Brazil |
| Associated research grant: | 11/50637-0 - Competence for Crassulacean Acid Metabolism (CAM) expression in epiphytic bromeliad: signaling, modulation of expression, transcriptional profile and interaction with the nitrogen metabolism, AP.TEM |
Abstract The Crassulacean Acid Metabolism (CAM) allows the assimilation of CO2 with a greater water use efficiency rather than the C3 and C4 metabolisms. In the epiphytic C3-CAM facultative bromeliad Guzmania monostachia (Bromeliaceae, Tillandsioideae), the C3 maximizes its growth under favorable environmental conditions, while CAM is manifested in stressful conditions. Since different nitrogen sources (i.e., inorganic and organic) are available in the nutrient-poor epiphytic environment, changes in the availability of nutrients and water can modulate physiological and molecular responses in G. monostachia in order to improve the nitrogen use efficiency and the expression of CAM. In this context, this project aims to investigate differences in the physiology and molecular biology related to nitrogen metabolism (absorption and assimilation) in different nitrogen sources (ammonium, nitrate or urea), and their role in photosynthetic modulation in G. monostachia in variable scenarios of nitrogen and water availability. Specifically, this study intends to answer the following questions: (1) Does G. monostachia have a preference for some source of nitrogen? Would it be organic or inorganic? (2) How do the transport and assimilation of different forms of nitrogen occur and where are they processed? (3) Is there a change in gene expression activating high-affinity transporter genes at low nitrogen concentrations? (4) Does nutritional preference of G. monostachia change over time by the combined presence of more than one form of nitrogen? (5) Do different nitrogen sources modulate CAM photosynthesis in this bromeliad species, showing an association between nitrogen and CAM expression under drought conditions? Does the expression of the specific CAM-PEPc gene be variable? (AU) | |
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