Abstract
Within 15 min after application of pollen to the stigma of carnation flowers ( Dianthus caryophyllus L. cultivar ‘White Sim’), ethylene (C 2H 4) production by the gynoecium had increased substantially. Pollen germination did not start until 1 h after pollination. Analysis of materials removed from pollen by a brief rinse with an aqueous solvent showed the presence of high concentrations of the C 2H 4 precursor, 1-aminocyclopropane-1-carboxylic acid (ACC). This compound, which was found to be present in pollen from a number of flower species and which increased in concentration as the anthers developed, may be an important mediator of the early response of flowers to pollination.
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