Inhibition of Ethylene Biosynthesis in Carnation Petals by Cytokinin

Abstract

Pretreatment of detached carnation petals (Dianhius caryophyUs cvWhite Sim) for 24 hours with 0

An Ethylene-Induced Regulatory Module Delays Flower Senescence by Regulating Cytokinin Content

“…Accordingly, it has been reported that rose varieties with long flower longevity contain higher levels of CTKs than those with shorter lived flowers (Mayak and Halevy, 1970), and CTK application has been shown to delay flower senescence in several plant species, including carnation (Dianthus caryophyllus), petunia (Petunia hybrida), and rose (Mayak and Halevy, 1970;Mor et al, 1983;Taverner et al, 1999). Conversely, an increase in transcript abundance of two genes encoding CTK oxidase/dehydrogenase during carnation petal senescence accelerated CTK degradation and promoted corolla senescence (Hoeberichts et al, 2007).…”

“…For example, in carnation, declining CTK levels act as a trigger for ethylene production (Eisinger, 1977), while treatment of carnation petals with CTK blocked the conversion of exogenously supplied 1-aminocyclopropane-1-carboxylic acid to ethylene (Mor et al, 1983;Taverner et al, 1999). In petunia, driving the overexpression of the CTK biosynthesis gene IPT with the Senescenceassociated gene12 (SAG12) promoter resulted in a significant delay in flower senescence, accompanied by reduced ethylene sensitivity (Chang et al, 2003).…”

Effects of 6-benzylaminopurine treatments on the longevity of harvested Grevillea 'Sylvia' inflorescences

“…Zeatin, transzeatin riboside, isopentenyladenine and isopentenyladenosine all delayed rose senescence (Lukaszewska et al 1994). Mor et al (1983) found that BA was as effective as kinetin and zeatin in delaying senescence of detached carnation petals. The mechanism of cytokinin-induced delay in senescence may involve reduced ethylene production.…”

“…Cytokinin action in plant tissue is dependent upon the type of cytokinin, internal translocation of cytokinins and regulation by other plant growth regulators, such as ethylene and auxin (Mor et al 1983;Cook et al 1985;van Staden et al 1987van Staden et al , 1990. One type of cytokinin occurs naturally in plants and includes zeatin, dihydrozeatin, and isopentenyl adenine.…”

“…Exogenous treatments with cytokinin may delay senescence of cut flowers (Mor et al 1983, Cook et al 1985. Dihydrozeatin is reported to be the most effective cytokinin in prolonging carnation vase life (van Staden et al 1987(van Staden et al , 1990van Staden and Bossè 1989;Bichara and van Staden 1993).…”