DEVELOPING AIR LAYERING PRACTICES FOR PROPAGATION OF DRACAENA MARGINATA LAM. UTILIZING PHLOROGLUCINOL AND SEAWEED EXTRACT AS IBA-SYNERGISTS OR ALTERNATIVES

Document Type : Original Research Article

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faculty of agriculture assiut university

Abstract

In an experiment laid out in completely randomized block design, eight experimental treatments representing all-possible combinations between indole-3-butyric acid potassium salt at 300 ppm (IBA), phloroglucinol at 300 ppm (PG) and seaweed extract (SWE) at 2 ml/l were evaluated for their effects on rooting of Dracaena marginata Lam. air layers. The research was conducted under shade house conditions of the Nursery of Ornamental Plants, Faculty of Agriculture, Assiut University, Egypt during 2018 and 2019 successive growing seasons. All treated air layers with IBA, PG and SWE each alone or in combinations recorded significant increases in rooting percentage comparing to untreated control air layers. The highest rooting percentages were found in air layers received 10 ml/air layer from PG alone or the IBA + SWE or IBA + PG + SWE without significant differences between them. Air-layers exposed to IBA alone or in combination with PG and/or SWE attained the most favorable root traits in terms of high number of roots with appropriate length and a balanced mass and volume. High carbohydrate concentrations positively correlated with rooting percentage and roots weight and volume. Studying correlations between rooting characteristics and the internal contents of root zone tissues of total carbohydrates and total phenolics exhibited that rooting percentage correlated positively with total carbohydrates percentage and negatively with total phenolics in root zone tissues. While, the relationships between the other root traits of succeeded layers and total carbohydrates and total phenolics contents in rooting zones did not attain any significant relations.

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