Acta Physiologiae Plantarum

, Volume 23, Issue 3, pp 279–284

Selenomethionine as a dormancy-breaking agent in seeds of Stylosanthes humilis

  • R. S. Barros
  • A. W. de Paula Freitas


Physiological dormancy of scarified seeds of Townsville stylo (Stylosanthes humilis H.B.K.) was released by seleno-L-methionine (SeM), but not by L-methionine. This regulating effect was impaired by inhibitors of ethylene biosynthesis and action; in the first case SeM action was restored by 2-chloroethylphosphonic acid (CEPA) and 1-aminocyclopropane-1-carboxylic acid (ACC). The Se-aminoacid proved to be toxic in a time-dependent manner to seedling growth, inhibiting primarily the hypocotyl expansion. This toxicity is suggested to trigger ethylene biosynthesis, which would promote germination of dormant seeds.

Key words

ethylene growth regulators methionine germination selenium Townsville stylo 


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Copyright information

© Department of Plant Physiology 2001

Authors and Affiliations

  • R. S. Barros
    • 1
  • A. W. de Paula Freitas
    • 1
  1. 1.Departmento de Biologia VegetalUniversidade Federal de ViçosaViçosa, MGBrasil

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