Ethylene Modification of an Auxin Pulse in Cotton Stem Sections 1
AUTOR(ES)
Beyer, Elmo M.
RESUMO
The effect of ethylene on the basipetal movement of indole-3-acetic acid-1-14C through cotton stem sections (Gossypium hirsutum, L. var. Stoneville 213) was studied apart from processes involved in the uptake and exit of auxin by the section. Stem sections 60 mm in length were pretreated with ethylene or placed in room air (control) and pulse labeled for 20 min with IAA-1-14C. In both the ethylene treated and control sections, the IAA-1-14C taken up moved basipetally as a peak of radioactivity. Generally, the applied pulse moved down the stem sections at an average velocity of approximately 5.8 mm per hr. In some experiments, however, ethylene slightly reduced the velocity of auxin transport. Although the peak of radioactivity became broader and more dispersed during its migration through the section, it was still distinguishable after 7 hr of transport.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=396328Documentos Relacionados
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