Molecular and phylogenetic characterization of the sieve element occlusion gene family in Fabaceae and non-Fabaceaeplants |
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| Authors: | Boris Rüping Antonia M Ernst Stephan B Jekat Steffen Nordzieke Anna R Reineke Boje Müller Erich Bornberg-Bauer Dirk Prüfer Gundula A Noll |
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| Affiliation: | 1.Institut für Biochemie und Biotechnologie der Pflanzen,Westf?lische Wilhelms-Universit?t Münster,Hindenburgplatz 55,Germany;2.Fraunhofer Institute for Molecular Biology and Applied Ecology (IME),Forckenbeckstra?e 6,Germany;3.Institut für Evolution und Biodiversit?t,Westf?lische Wilhelms-Universit?t Münster,Hüfferstra?e 1,Germany |
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| Abstract: | Background The phloem of dicotyledonous plants contains specialized P-proteins (phloem proteins) that accumulate during sieve element differentiation and remain parietally associated with the cisternae of the endoplasmic reticulum in mature sieve elements. Wounding causes P-protein filaments to accumulate at the sieve plates and block the translocation of photosynthate. Specialized, spindle-shaped P-proteins known as forisomes that undergo reversible calcium-dependent conformational changes have evolved exclusively in the Fabaceae. Recently, the molecular characterization of three genes encoding forisome components in the model legume Medicago truncatula (MtSEO1, MtSEO2 and MtSEO3; SEO = sieve element occlusion) was reported, but little is known about the molecular characteristics of P-proteins in non-Fabaceae. |
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