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Review Article|26 Aug 2015|OPEN
Ethylene resistance in flowering ornamental plants – improvements and future perspectives
Andreas Olsen1 , Henrik Lütken1 , , Josefine Nymark Hegelund1 and Renate Müller,1
1Faculty of Science, Department of Plant and Environmental Sciences, University of Copenhagen, Højbakkegård Alle 9-13, 2630 Taastrup, Denmark
*Corresponding author. E-mail: hlm@plen.ku.dk

Horticulture Research 2,
Article number: 38 (2015)
doi: https://doi.org/10.1038/hortres.2015.38
Views: 988

Received: 04 Jun 2015
Revised: 20 Jul 2015
Accepted: 22 Jul 2015
Published online: 26 Aug 2015

Abstract

Various strategies of plant breeding have been attempted in order to improve the ethylene resistance of flowering ornamental plants. These approaches span from conventional techniques such as simple cross-pollination to new breeding techniques which modify the plants genetically such as precise genome-editing. The main strategies target the ethylene pathway directly; others focus on changing the ethylene pathway indirectly via pathways that are known to be antagonistic to the ethylene pathway, e.g. increasing cytokinin levels. Many of the known elements of the ethylene pathway have been addressed experimentally with the aim of modulating the overall response of the plant to ethylene. Elements of the ethylene pathway that appear particularly promising in this respect include ethylene receptors as ETR1, and transcription factors such as EIN3. Both direct and indirect approaches seem to be successful, nevertheless, although genetic transformation using recombinant DNA has the ability to save much time in the breeding process, they are not readily used by breeders yet. This is primarily due to legislative issues, economic issues, difficulties of implementing this technology in some ornamental plants, as well as how these techniques are publically perceived, particularly in Europe. Recently, newer and more precise genome-editing techniques have become available and they are already being implemented in some crops. New breeding techniques may help change the current situation and pave the way toward a legal and public acceptance if products of these technologies are indistinguishable from plants obtained by conventional techniques.