Veränderung von N-Verbindungen in Zierpflanzenstecklingen durch N-Düngung der Mutterpflanzen und Stecklingslagerung und ihr Effekt auf die Jungpflanzenentwicklung

authored by

Inga M Matzner

supervised by

Traud Winkelmann

Abstract

A rapid and extensive adventitious root formation as well as a persistent, intense green leaf colour are pivotal quality traits during young plant production of ornamental plants. This work aims to shed light upon the impact of nitrogen (N) fertilisation of donor plants in combination with varied conditions of dark storage of cuttings on different metabolic N fractions (NF) in the cutting and their effect on rooting and leaf colour in five ornamental species (Chrysanthemum indicum, Impatiens hawkeri, Pelargonium peltatum, Pelargonium × hortorum, Euphorbium pulcherrima). While an increased N fertilisation led to both higher absolute concentrations of all NF and a deeper green leaf colour in cuttings, particularily a long and warm dark storage led to an increased proteolysis and hence a shift towards mobile organic NF such as amides and amines. This shift correlated in chrysanthemum, zonal pelargonium and petunia (Petunia × hybrida) with an increase in the concentrations of free amino acids in different cutting organs and urea in the oldest leaf and was accompanied with a storage-dependent leaf yellowing in pelargonium and poinsettia. The extent of adventitious root formation was crop-dependently influenced by the N status and/or dark storage. The dynamics of NF in cutting tissue and the crop-dependent effect of N mobilisation on young plant development are discussed against the backdrop of simultaneous shifts in carbohydrate pools.

Organisation(s)

Section Reproduction and Development

Type

Doctoral thesis

No. of pages

309

Publication date

03.09.2024

Publication status

Published

Electronic version(s)

https://doi.org/10.15488/17962 (Access: Open)