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  Eur.J.Hortic.Sci. 80 (6) 280-287 | DOI: 10.17660/eJHS.2015/80.6.3
ISSN 1611-4426 print and 1611-4434 online | © ISHS 2015 | European Journal of Horticultural Science | Original article

Trinexapac-ethyl modifies plant architecture of ornamental pepper

S. Sever Mutlu and N. Kurtulan
Department of Landscape Architecture, Faculty of Agriculture, University of Akdeniz, Antalya, Turkey

SUMMARY
Compact and well branched ornamental peppers are commercially preferred. Plant growth regulators (PGR) and pinching, removal of shoot apices, are used to create ornamentals with high aesthetic value. Trinexapac-ethyl (TE) is a foliarly absorbed plant growth regulator (PGR) and belongs to acylcyclohexadione chemical family that inhibits gibberellic acid biosynthesis. The objective of this study was to investigate possibility of using TE as a PGR in ornamental pepper (Capsicum annuum L.) production to suppress vertical growth and/or substitute for pinching to produce more compact and quality plants. The 0, 2, 4, 8, and 12 ppm TE was foliarly applied onto either pinched or non-pinched plants. Pinching and TE reduced the canopy height up to 25% and 38%, respectively. TE along with pinching reduced Height/Diameter (H/D) ratio from 2.3 down to 1.5, a more commercially desired compactness. TE increased the chlorophyll content and total fruit number. TE may substitute costly pinching treatment for growth control. The absence of phytotoxicity and improved production may justify recommendation of TE for commercial ornamental pepper production.

Keywords pinching, plant growth regulator, H/D ratio, Capsicum annuum, fruit number, gibberellin biosynthesis inhibitor

Significance of this study

What is already known on this subject?

  • Pinching and/or plant growth regulators (PGR) (i.e., paclobutrazol, daminozide) are used to improve compactness of ornamental plants. Pinching increases the production cost and use of paclobutrazol has been revoked in some EU member states and use of daminozide restricted. Trinexapac-ethyl (TE) is registered for height control of grasses. However, the efficacy of TE on growth of ornamental pepper is unknown.
What are the new findings?
  • TE and pinching reduced the canopy height and Height/Diameter (H/D) ratio. TE delayed the fruit set but increased the total fruit number and chlorophyll content without causing phytotoxicity.
What is the expected impact on horticulture?
  • TE may offer a safer PGR alternative in production of commercially acceptable compact plants and may substitute pinching treatment, providing an economic advantage. Results of this study on ornamental pepper and of previous report on chrysanthemum indicate that TE as PGR may find a larger use on other dicot ornamental species.

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E-mail: songulmutlu@akdeniz.edu.tr  

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Received: 6 March 2015 | Revised: 17 July 2015 | Accepted: 2 October 2015 | Published: 21 December 2015 | Available online: 21 December 2015

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