Abstract
‘Blue Blazer’ hyacinths and ‘Jack Snipe’ Narcissus were sprayed to run-off with 2000 mg l −1 ethephon when average leaf length was 10 cm. Ethephon reduced the length of the flower scape of ‘Blue Blazer’ by 20% at “bud” stage of development, and by 28% at full flower. No effect on date of flowering was observed. The floral scape length reduction of ‘Jack Snipe’ was 27% at the “goose-neck” stage and 25% at full flower. Anatomical and stereological examinations revealed significant cellular and structural differences between treated and untreated plants of both species. The cell sizes of the treated plants were smaller and the intercellular space sizes were decreased. Endodermal cell separation was reduced and pith deterioration was delayed. There was a 20–30% increase in the number of cells in the treated plants; a phenomenon not usually associated with ethephon. Thus, while ethephon normally promotes senescence, in these studies, it enhanced cell division.
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