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1-Aminocyclopropane-1-Carboxylic Acid Concentrations in Shoot-Forming and Non-Shoot-Forming Tobacco Callus Cultures ¹

Melvin Calvin Laboratory, University of California, Berkeley, California 94708, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94708

Shoot-forming tobacco (Nicotiana tabacum var. Wisconsin 38) callus tissues contain significantly lower concentrations of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid compared to non-shoot-forming callus tissues. This difference is evident 1 day after subculture to shoot-forming or non-shoot-forming medium, and is maintained through the first week of growth. The lack of auxin in shoot-forming medium is the probable cause for this difference in ACC concentrations.