Polyphenolic Acid Changes in Stem Cuttings of Rosa Cultivars in Relation to Phenological Stage and Rooting Enhancers

Abstract

Biostimulants and rooting enhancers, i.e., auxins, affect many aspects of plant development. The experiment in this paper focused on the response of single-node rose semi-woody cuttings to rhizogenesis-enhancing preparations based on plant extracts in terms of changes in polyphenolic acid content. The shoots were cut at four stages of flowering development: (i) flower buds closed, (ii) open flower, (iii) immediately after petal shedding, (iv) 7–14 days after petal shedding. The experimental material consisted of six old, once-flowering rose cultivars (‘Duchesse d’Angoulême’, ‘Hurdals’, ‘Maiden’s Blush’, ‘Mousseuse Rouge’, Rosa beggeriana ‘Polstjårnan’, R. helenae ‘Semiplena’). The following rooting-enhancers were applied: commercial powder containing (i) 0.4% indolebutyric acid (IBA) or (ii) 0.2% naphthalene acetic acid (NAA) or commercial plant-extract mixtures named in the experiment, i.e., (iii) Seaweed Preparation, (iv) Humic Preparation, and (v) Plant Preparation, and (vi) the control cuttings, which remained untreated. The level of polyphenolic acids was determined before and after rooting. The content of polyphenolic acids had a tendency to decrease during the period of rhizogenesis for all cultivars and all phenological stages. Changes in polyphenolics were affected by all the rooting enhancers, but the contents of these compounds before and after rooting was not found to unambiguously correlate with either the final rooting percentage or quality of cuttings.

Application of commercial seaweed extract-based biostimulants to enhance adventitious root formation in ornamental cutting propagation protocols: a review

“…Historical roses are especially difficult to propagate, with the process of rhizogenesis lasting for a minimum of 12 weeks and connected with low quality of rooted cuttings. Monder and Pacholczak (2023) pointed out that, on six aged, once-flowering rose cultivars ('Duchesse d'Angouleme,' 'Hurdals,' 'Maiden's Blush,' 'Mousseuse Rouge,' Rosa beggeriana 'Polstjårnan,' R. helenae 'Semiplena') treated with Bio Rhizotonic, the polyphenolic acid content decreased during the rhizogenesis period.…”

Enhancing the Propagation and Cultivation Framework of Greek Rosa canina L. Germplasm via Sustainable Management Techniques

“…and the Rosa sp. [31,32]. Indicative examples are coconut water, which includes crucial phytohormones that support the plant's maintenance and development [33], along with various rooting gels [29].…”