Beitrag in Konferenzband
Cytokinins Inhibit Leaf Senescence in Pelargonium Cuttings


Details zur Publikation
Autorenliste: Mutui T.M., Mibus H., Serek M.
Jahr der Veröffentlichung: 2015
Buchtitel: Proceedings of the Vth International Conference Postharvest Unlimited: Lemesos, Cyprus, June 10 - 13, 2014
Herausgeber*in: G.A. Manganaris
Serientitel: Acta horticulturae
Serienzählung: 1079
Erste Seite: 325
Letzte Seite: 330
Verlag: International Society for Horticultural Science (ISHS)
Ort: Leuven
ISBN: 978-94-6261-071-2
ISSN: 0567-7572
eISSN: 2406-6168
DOI: 10.17660/ActaHortic.2015.1079.40
Sprachen: Englisch
Peer reviewed

Abstract
Senescence in plants is a complex, genetically determined cell death program that is characterized by protein breakdown, and disintegration of chloroplasts followed by chlorophyll loss. Cytokinins, including aromatic cytokinins and substituted phenyl urea with powerful cytokinin-like activity, are reported to have anti-senescence activities. Hence, they play an important role in delaying the onset of leaf senescence. We examined the possible use of cytokinins in delaying leaf senescence in Pelargonium x hortorum cuttings cultivar 'Katinka' without adversely retarding rooting. Treated leaves maintained low leaf chroma, high hue values and high chrophyll content because they remained green. Applying aromatic cytokinin to Pelargonium cuttings had no effect on the rooting proportion (%). However, it reduced all other root parameters studied. Our study showed that the investigated cytokinins are very effective in retarding leaf senescence. When taken together with the ease of rooting cuttings, aromatic cytokinin (meta-Topolin) is a suitable alternative to phenyl urea (Thidiazuron) in delaying the onset of leaf yellowing in plants.