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Advisor(s)
Abstract(s)
In this study sixteen cut chrysanthemum cultivars were used to evaluate the
effects of high CO2 concentration (1500 μmol mol-1) on growth, time to flowering
and visual quality as compared to the concentration used in commercial greenhouses
(600 μmol mol-1). CO2 enrichment increased light use efficiency (11-41%) and total
plant dry mass (TDM) (5-40%) in a cultivar dependent manner. This TDM increase
was a result of: (i) higher relative growth rate during the long day period (i.e., 0 to 2
weeks; LD); and (ii) higher absolute growth rate both during the period between 2
to 6 weeks (SD1), and 6 weeks to final harvest (SD2). Cultivar differences in TDM at
flowering between the two CO2 concentrations could be explained by differences in
growth rate during the LD and SD2 periods. Furthermore, growing at high CO2
regime enhanced the number of flowers and flower buds per plant (NoF, 4-48%).
Interestingly, the cultivars that showed the highest percentage of TDM increase,
with CO2 enrichment, were not the ones that had the highest increase in the
percentage of NoF. In contrast, high CO2 concentration had only a minor or no
effect on the number of internodes on the main stem and on the reaction time in all
the cultivars examined. From this research it is concluded that there is a large
variation in the response of cut chrysanthemum cultivars to CO2 enrichment, in
terms of TDM and NoF, which gives possibilities for breeding.
Description
Keywords
Carbon dioxide Chrysanthemum morifolium Closed greenhouse Cultivars greenhouse Cultivars Flower buds
Citation
FANOURAKIS, D....[et al] - Genotypic variation of cut chrysanthemum response to high CO2 concentration: growth, time to flowering and visual quality. In International Symposium on High Technology for Greenhouse Systems: GreenSys2009. Quebec, Canadá, 14-19 June (2009) - Acta Horticulturae. ISSN 0567-7572. N.º 893 (2011), p. 839 - 848