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Start of funding 01.07.2005
Role of plastidic metabolite transporters during gametophyte and pollen development
Prof. Dr. Jürgen Soll
Ludwig-Maximilians-University of Munich
Fakultät für Biologie - Dep. Biologie I - Biochemie u. Physiologie d. Pflanzen
Prof. Dr. Sheila McCormick
University of California, Berkeley
Plant Gene Expression Center
Chloroplasts in the green organs of plants are the site of photosynthesis and carbon fixation. Besides these basic functions, essential biosynthetic processes (amino acid, fatty acid, isoprenoid biosynthesis) proceed only inside the plastid. Thus, all plant cells contain at least one member of the plastid organelle family. Plastids are surrounded by two membranes: the inner envelope, containing selective carrier proteins, and the outer envelope, which like in its cyanobacterial anchestors, includes several channel. Surprisingly, these outer envelope proteins (OEPs) have distinct solute selectivities. In the model plant Arabidopsis thaliana several of the OEPs are highly expressed in pollen. Since a mutant of the OEP24 gene is lethal and impaired in pollen germination, we propose an essential function for OEP24.1 during pollen development. Thus, these OEPs provide a bottleneck to study metabolic networks between plastids and the surrounding cell during pollen and gametophyte development.