The Lack of Effect of Cyclic Adenosine 3′:5′-Monophosphate on Avena Coleoptile Growth 1
AUTOR(ES)
Edgerton, Mira
RESUMO
The effects of cyclic adenosine 3′:5′-monophosphate (cAMP) on the growth of Avena coleoptile segments over 4 to 10 hours were monitored with a position sensing transducer. At pH 6, cAMP (0.1 mm with and without 2.5 mm glucose; or 2 mm alone) or dibutyryl cAMP (0.1 mm) was added at the beginning of the experiment, or after about 1 hour or after about 6 or 7 hours. Under all conditions tested, cAMP compounds had little or no effect on coleoptile segment elongation. Inasmuch as cAMP does not duplicate the rapid and vigorous elongation obtained with 2 μm auxin, the hypothesis that cAMP is a mediator of auxin activity is not supported by experimental evidence in this system. This conclusion is dependent upon the assumption that the cAMP compounds penetrated the tissue.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=541688Documentos Relacionados
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