Plug Cell Volume, Growing Media Quality and Benzyl Aminopurine (BAP) Spray Effects for Nursery Growth of Impatiens walleriana

Main Article Content

J. De Lojo
E. Gandolfo
E. Giardina
C. Boschi
A. Di Benedetto

Abstract

Plant propagators must take two technological critical decisions: the plug-cell size and the growing medium, both of which have been mentioned as abiotic stress sources for bedding pot plants. However, only a few recent reports on bedding pot plants have simultaneously included limiting and non-limiting plug cell volumes and growing medium during nursery. The aim of this work was to assess the nursery performance of Impatiens walleriana seedlings grown in four plug cell volumes and four growing media with significant differences in both physical and chemical properties. Plants were sprayed or not with an early and single benzyl aminopurine (BAP) dose, aiming to understand how they interact on determining biomass accumulation at the pot transplant stage. The hypothesis tested was that, both plug cell volume and growing medium, must be seen as additive abiotic stress sources, which can be partially overridden by exogenous cytokinin supply. The main result was that, in I. walleriana seedlings, the abiotic stress imposed by the growing medium quality during nursery had a higher effect on biomass accumulation (on both fresh and dry base), leaf area expansion and photo assimilates partitioning than plug cell volume and constitute an interactive process associated with cytokinin synthesis. From a grower´s point of view, one expensive option to avoid root restriction is to use high quality growing media and increase the plug cell volume. In contrast, a single 100 mg L-1 BAP spray can partially override the root restriction symptoms related to abiotic stresses. The novelty of this work is related to the fact that growing media quality would be a more limited factor than plug cell volume for I. walleriana seedlings during nursery.

Keywords:
Abiotic stress, bedding plants, cytokinin, plug trays

Article Details

How to Cite
Lojo, J. D., Gandolfo, E., Giardina, E., Boschi, C., & Benedetto, A. D. (2019). Plug Cell Volume, Growing Media Quality and Benzyl Aminopurine (BAP) Spray Effects for Nursery Growth of Impatiens walleriana. International Journal of Plant & Soil Science, 27(6), 1-13. https://doi.org/10.9734/ijpss/2019/v27i630091
Section
Original Research Article

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