FACTORS AFFECTING GROWTH AND DEVELOPMENT OF DAYLILIES DURING MICROCUTTING ACCLIMATIZATION

J. Treder, A. Borkowska, E. Gabryszewska
Introduction of new cultivars of daylilies (Hemerocallis spp.) into commercial production requires effective methods of propagation. The quality of microcuttings, derived from in vitro multiplication can be influenced by growing conditions during acclimatization. The aim of the study was to accelerate growth and improve quality of plantlets of two cultivars of daylilies ‘Fire Agate’ and ‘Polish Truffle’. Two concentrations of CO2 (350 and 1000 µmol mol-1), two irradiance levels (50 and 150 µmol m-2 s-1 PPFD) and two growing media (peat with perlite and pear with coir, 3:1 v/v) were tested during 8 weeks of acclimatization.
Enrichment with CO2 of and higher irradiance level significantly improved growth of both daylily cultivars. Plantlets of ‘Polish Truffle’ grown at higher irradiance level had more leaves with higher length, irrespectively of CO2 enrichment. Longer leaves had plants grown in medium consisted of peat and perlite. In case of ‘Fire Agate’ the number of leaves was not affected by any experimental factor but leaves of plants grown at higher irradiation level were 12% longer. Fresh and dry weight of aerial part and root system of daylilies were significantly higher when plants were grown with CO2 enrichment and higher irradiation level than plant grown at control conditions. Better root system with longer roots of both cultivars had plantlets grown in medium consisting of peat and perlite than in peat and cocopeat (coir).
Treder, J., Borkowska, A. and Gabryszewska, E. (2013). FACTORS AFFECTING GROWTH AND DEVELOPMENT OF DAYLILIES DURING MICROCUTTING ACCLIMATIZATION . Acta Hortic. 1002, 199-204
DOI: 10.17660/ActaHortic.2013.1002.24
https://doi.org/10.17660/ActaHortic.2013.1002.24
CO2 enrichment, Hemerocallis, light level, micropropagation, growing media, cocopeat
English

Acta Horticulturae