Cobalt and Plant Development: Interactions with Ethylene in Hypocotyl Growth 1
AUTOR(ES)
Grover, Scott
RESUMO
Co2+ promoted elongation of hypocotyl segments of light-grown cucumber (Cucumis sativus) seedlings. Time course and dose response data are presented and interactions with IAA, gibberellin, cyclohexanol, and cotyledons described. Segments without cotyledons responded to Co2+ only if grown in gas-tight vessels with IAA added. When bases of cotyledons were ringed with an inhibitor of auxin transport, Co2+ caused no growth promotion in the hypocotyl. Co2+ prevented lateral swelling of hypocotyls treated with supraoptimal IAA. Removal of ethylene from the atmosphere reduced the Co2+ response, but Co2+ did not counteract the inhibitory effect of increased ethylene levels. These results are consistent with the hypothesis that Co2+ promotes hypocotyl elongation by inhibiting ethylene production. The hypothesis was confirmed by a direct demonstration that Co2+, at growth-promoting concentrations, powerfully inhibited ethylene production in the cucumber hypocotyl.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=542141Documentos Relacionados
- Ethylene in Plant Growth
- Effect of Abscisic Acid and Its Interactions with Other Plant Hormones on Ethylene Production in Two Plant Systems 123
- Analysis of the Multiple Roles of Gld-1 in Germline Development: Interactions with the Sex Determination Cascade and the Glp-1 Signaling Pathway
- The Arabidopsis eer1 Mutant Has Enhanced Ethylene Responses in the Hypocotyl and Stem1
- Ethylene Stimulates Endoreduplication But Inhibits Cytokinesis in Cucumber Hypocotyl Epidermis1
