The Promoters of Forisome Genes MtSEO2 and MtSEO3 Direct Gene Expression to Immature Sieve Elements in Medicago truncatula and Nicotiana tabacum

  • Gundula A. Noll
  • Boris Rüping
  • Antonia M. Ernst
  • Maria Bucsenez
  • Richard M. Twyman
  • Rainer Fischer
  • Dirk Prüfer


Forisomes are mechanoproteins that function as valves in the phloem sieve tubes of the Fabaceae. Changes in the Ca2+ level that occur after wounding trigger an instantaneous switch between the condensed and dispersed conformations, allowing forisomes to seal the sieve plate pores of injured sieve elements. Recently, three genes encoding forisome components from Medicago truncatula were identified [Medicago truncatula sieve element occlusion 1 (MtSEO1), MtSEO2 and MtSEO3] and MtSEO1 expression was shown to be restricted to immature sieve elements. Here, we present a detailed molecular analysis of the MtSEO2 and MtSEO3 promoters and show, through reverse transcriptase-polymerase chain reaction and reporter-transgenic experiments in M. truncatula roots and tobacco plants, that their expression profiles are comparable to MtSEO1. The impact of these data on the likelihood of MtSEO gene co-regulation by common transcription factors is discussed.


Medicago truncatula Forisome Promoter Phloem Immature sieve elements 



companion cell


green fluorescent protein




Medicago truncatula


sieve element


sieve element occlusion



The technical assistance of Ann-Christin Müller is gratefully acknowledged. This work was partially supported by the BMBF grant 0312014, the Fraunhofer MAVO program and by the VolkswagenStiftung, contract no. I/82 075.


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Gundula A. Noll
    • 1
  • Boris Rüping
    • 1
  • Antonia M. Ernst
    • 1
  • Maria Bucsenez
    • 1
  • Richard M. Twyman
    • 2
  • Rainer Fischer
    • 3
  • Dirk Prüfer
    • 1
    • 3
  1. 1.Institut für Biochemie und Biotechnologie der Pflanzen der Westfälischen WilhelmsUniversität MünsterMünsterGermany
  2. 2.Department of BiologyUniversity of YorkYorkUK
  3. 3.Fraunhofer Institute for Molecular Biology and Applied Ecology (IME)AachenGermany

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