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Apical localization of 1-aminocyclopropane-1-carboxylic acid and its conversion to ethylene in etiolated pea seedlings

✍ Scribed by J. E. Taylor; D. G. Grosskopf; B. A. McGaw; R. Horgan; I. M. Scott

Publisher
Springer-Verlag
Year
1988
Tongue
English
Weight
295 KB
Volume
174
Category
Article
ISSN
0032-0935

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✦ Synopsis

The biosynthetic basis for the high rates of ethylene production by the apical region of etiolated pea (Pisum sativum L.) seedlings was investigated. The ethylene precursor l-aminocyclopropane-l-carboxylic acid (ACC) was quantified in extracts of various regions of seedlings by measuring isotopic dilution of a 2H-labelled internal standard using selected-ion-monitoring gas chromatography/mass spectrometry. The ACC levels in the apical hook and leaves were much higher than in the expanded internodes of the epicotyl. The capacity of excised tissue sections to convert exogenous ACC to ethylene was also much greater in the apical region, reflecting the distribution of soluble protein in the epicotyl.

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