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. 1976 Jun;57(6):886–889. doi: 10.1104/pp.57.6.886

Cobalt and Plant Development

Interactions with Ethylene in Hypocotyl Growth 1

Scott Grover a, William K Purves b
PMCID: PMC542141  PMID: 16659591

Abstract

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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