Multiple factors influence adventitious rooting in carnation (Dianthus caryophyllus L.) stem cuttings
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Efficient propagation of uniform starting material is a critical requirement for mass production of most ornamental plants, including carnation. For some elite cultivars, the production of young plantlets is limited by poor adventitious root formation from stem cuttings. We previously characterized the molecular signature during adventitious rooting in two carnation cultivars, 2101-02 MFR and 2003 R 8, which were selected because of their contrasting rooting performance. To determine additional factors that contribute to the differences observed in adventitious rooting during the commercial scaling-up of this species, we characterized rooting performance and endogenous hormone levels in stem cuttings of these two cultivars during one production season. We found that stem cutting production declined during the harvest season in a cultivar-dependent manner. In addition, the initiation of adventitious roots in the stem cutting base depended on its endogenous auxin and cytokinin levels at harvest time, while their subsequent growth and development was mainly influenced by the physiological status of the mother plant at harvest time and of the stem cutting during the rooting process.
KeywordsAdventitious roots Auxin/cytokinin ratio ABA Ornamental plants
This work was supported by the Ministerio de Economía y Competitividad (MINECO) of Spain (Grants Nos. AGL2012-33610 and BIO2015-64255-R), by the Center for the Development of Industrial Technology (CARNOMICS Eurostars-EUREKA Project E! 6384), and by FEDER Funds of the European Commission.
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