Abstract
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.
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