Abstract
P-proteins are structural phloem proteins discussed to be involved in the rapid sealing of injured sieve elements. P-proteins are found in all dicotyledonous and some monocotyledonous plants, but additional crystalloid P-proteins, known as forisomes, have evolved solely in the Fabaceae. Both types are encoded by members of the sieve element occlusion (SEO) gene family, which comprises seven phylogenetic subgroups. The Fabaceae-specific subgroup 1 contains genes encoding forisome subunits in e.g. Medicago truncatula, Vicia faba, Dipteryx panamensis and Canavalia gladiata whereas basal subgroup 5 encodes P-proteins in Nicotiana tabacum (tobacco) and Arabidopsis thaliana. The function of remaining subgroups is still unknown. We chose Glycine max (soybean) as a model to investigate SEO proteins representing different subgroups in one species. We isolated native P-proteins to determine the SEO protein composition and analyzed the expression pattern, localization and structure of the G. max SEO proteins representing five of the subgroups. We found that subgroup 1 GmSEO genes encode forisome subunits, a member of subgroup 5 encodes a non-forisome P-protein and subgroup 2 GmSEO genes encode the components of forisome tails, which are present in a restricted selection of Fabaceaen species. We therefore present the first molecular characterization of a Fabaceae non-forisome P-protein and the first evidence that forisome tails are encoded by a phylogenetically-distinct branch of the SEO gene family.
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Acknowledgments
The technical assistance of Raphael Soeur, Christiane Fischer, Claudia Hansen and Heike Hinte (Fraunhofer Institute for Molecular Biology and Applied Ecology, IME) is gratefully acknowledged. We also thank Sascha Ahrens for plant cultivation (Institute of Plant Biology and Biotechnology, University of Münster) and Lena Harig and Boje Müller (Fraunhofer Institute for Molecular Biology and Applied Ecology, IME) for critical reading of the manuscript. This work was funded by Fraunhofer internal grants.
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Sascia Zielonka and Antonia M. Ernst contributed equally to this work.
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Zielonka, S., Ernst, A.M., Hawat, S. et al. Characterization of five subgroups of the sieve element occlusion gene family in Glycine max reveals genes encoding non-forisome P-proteins, forisomes and forisome tails. Plant Mol Biol 86, 51–67 (2014). https://doi.org/10.1007/s11103-014-0211-z
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DOI: https://doi.org/10.1007/s11103-014-0211-z