RELATIONSHIP OF FLORAL PRESERVATIVES TO WATER MOVEMENT, FLUORIDE DISTRIBUTION AND INJURY IN GLADIOLUS AND OTHER CUT FLOWERS

F.J. Marousky, S.S. Woltz
Cut gladiolus spikes were held in water or 8-hydroxyquinoline citrate plus sucrose (8-HQC + S) with and without fluoride (as NaF). F content and injury in basal, 3rd, and 5th floret were measured after 3 and 4 days. At 3 days, injury and F content were greater in basal than in upper florets. After 4 days, the severity of injury and F content increased at a greater rate in the 3rd and 5th florets than in basal floret. Spikes held in 8-HQC + S had a greater F content and more injury than spikes held in water. Spikes were held in water or 8-HQC + S, exposed to aqueous red dye solutions and colour development in florets was used as a relative index of water movement to florets.

Initially, more dye was translocated to basal than upper florets but as spikes aged more was translocated to upper florets and less to basal florets. This suggests that fluoride content and injury in gladiolus depend on the water-distribution pattern.

Gerberas held for 3 days in 1 ppm F developed severe petal injury. As F in water increased, injury increased. Gerberas held in 8-HQC + S retained colour, turgidity and lasted longer than those held in water. However, gerberas held in 8-HQC + S + F had more F in petals and greater injury than those held in 8-HQC + S alone, F-free water, or in water with F.

Cut chrysanthemums and snapdragons were not injured by F at 5 ppm or less. However, leaf and florets were injured when F exceeded 5 ppm. F content in leaves increased proportionally to level of F in vase water but F in florets increased only slightly.

Marousky, F.J. and Woltz, S.S. (1975). RELATIONSHIP OF FLORAL PRESERVATIVES TO WATER MOVEMENT, FLUORIDE DISTRIBUTION AND INJURY IN GLADIOLUS AND OTHER CUT FLOWERS. Acta Hortic. 41, 171-182
DOI: 10.17660/ActaHortic.1975.41.15
https://doi.org/10.17660/ActaHortic.1975.41.15

Acta Horticulturae