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Plant Cell Rep ; 21(5): 491-6, 2003 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-12789453

RESUMO

Gibberellins (GAs) A(1), A(3), A(4) and A(7), all 3beta-hydroxylated, growth-active GAs, significantly inhibited shoot elongation and the formation of nodes in in vitro-grown Hancornia speciosa, as did GA(20), a 3-deoxy precursor of GA(1). Ancymidol, an early-stage inhibitor of GA biosynthesis, significantly retarded shoot elongation without affecting the formation of nodes. Co-application of ancymidol and GA(1 )did not overcome the ancymidol-induced growth retardation. Trinexapac-ethyl, which can inhibit 3beta-hydroxylation (GA activation) and 2beta-hydroxylation (GA inactivation), gave no significant response on either shoot elongation or node formation, while two isomers of 16,17-dihydro GA(5), also inhibitors of GA 3beta-hydroxylation, significantly inhibited both shoot growth and the formation of nodes. These unusual results may indicate a unique metabolism for GAs in microcultured shoots of H. speciosa.


Assuntos
Apocynaceae/crescimento & desenvolvimento , Giberelinas/farmacologia , Brotos de Planta/crescimento & desenvolvimento , Apocynaceae/efeitos dos fármacos , Técnicas de Cultura , Relação Dose-Resposta a Droga , Giberelinas/antagonistas & inibidores , Giberelinas/biossíntese , Brotos de Planta/efeitos dos fármacos , Pirimidinas/farmacologia
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