The effect of silver thiosulphate preservative on the physiology of cut carnations II. Influence on endogenous cytokinins

Cytokinins in cut carnation flowers. IV effects of benzyladenine on flower longevity and the role of different longevity treatments on its transport following application to the petals

“…In earlier studies, [18] it has been shown that the cytokinin levels in the ovaries of senescing carnations increase . This increase could be the result of increased biosynthesis and/or transport .…”

“…In the intact senescing flower the ovary, which increases in size and turns green, yielded higher cytokinin-like activity than the petals [18] . It is possible that these higher levels of cytokinin could be brought about by increased biosynthesis in the ovary, increased transport from the petals which export carbohydrates [17], or increased transport from the stem .…”

“…Kelly, Staby and Chism [10] provided some evidence for the latter process by demonstrating that small amounts of [8-"C] benzyladenine did move into the ovaries of senescing carnations following stem application . Treatment with silver thiosulphate prevents ovary development, eliminates the increase in endogenous cytokinins [18], and prevents the movement of [8-"C] benzyladenine into the ovaries [10] . This implies that there is a relationship between ethylene production and the increase of cytokinins in the ovary .…”

Physiology and Biochemistry of Flower Petal Senescence

“…In many cases the senescence of flower petals can be delayed by applying cytokinins (Mayak and Dilley 1976a;Eisinger 1977;Mor et al 1983;Kelly et al 1985;Cook et al 1985). The aging of flower petals is often accompanied by a decline in the endogenous levels of cytokinins (Mayak and Halevy 1970;Van Staden and Dimalla 1980;Van Staden et al 1987). Cytokinins and cytokinin-like compounds have been shown to delay the ethylene-climacteric (Apelbaum and Katchansky 1978;Mor et al 1983;Cook et a].…”

Light Requirement for AgNO3 Inhibition of Ethrel-Induced Leaf Abscission from Cuttings of Vigna radiata

“…Ag+ is an effective inhibitor of several physiological responses mediated by ethylene, such as the triple response, abscission, senescence (1,4,5,9,12,14), rolling up of flower rib segments (2), cytokinin accumulation in reproductive organs (13), increases in chlorophyllase levels, and destruction of chloroplast membranes (11). Although the mode of action of Ag+ in inhibiting ethylene action has not been established, it was suggested that Ag+ may attach to the ethylene binding site (1,4).…”