The opening and senescence of gladiolus (Gladiolus sp.) florets was accompanied by climacteric or nonclimacteric
patterns of respiration and ethylene production, depending on variety, and whether data were expressed on a fresh-weight or floret basis. A climacteric pattern of ethylene production by the youngest buds on the spike (which never opened) was stimulated by cool storage, and was not affected by holding the spikes in a preservative solution containing sucrose.
Ethylene treatment had no effect on senescence of the florets of any of the cultivars tested. Pulse treatment of the spikes
with silver thiosulfate (STS) improved floret opening but not the life of individual florets. Sucrose and STS had similar
but not synergistic effects on floret opening, suggesting that STS improves flower opening in gladiolus by overcoming the
effects of carbohydrate depletion.
It was concluded that the fluidity of rose petal membranes decreases with age as a result of a decrease in phospholipid content, brought about by both reduced synthesis and enhanced degradation. Evidence supporting the view that the phenomena observed are related specifically to changes in the plasmalemma is discussed.