Postharvest quality of ornamental cuttings evaluated by chlorophyll fluorescence
Globalization of the ornamental industry leads to an increased import and export of young plants and cuttings. In the Belgian ornamental industry, there is an increasing trend of producing high quality cuttings in favourable climatic regions worldwide. Transport of these cuttings to the Belgian nurseries and worldwide can affect their quality. To assess postharvest quality after transport or storage, chlorophyll fluorescence was evaluated as a non-destructive method. Therefore, cuttings from two pot chrysanthemum (Chrysanthemum morifolium) cultivars, Conaco and Jasoda, were stored in dark conditions at 3.1±0.3°C for 35 days. After 0, 5, 10, 15, 21, 28, and 35 days, cuttings were removed from the cold room and were rooted. Chlorophyll fluorescence was measured during the first days of rooting. Results show optimal levels of Fq/Fm already 24 h after sticking for Conaco for all storage treatments. Jasoda showed suboptimal levels of Fq/Fm 24 h after sticking for cuttings that were stored for at least 21 days. Two days after sticking, a suboptimal level of Fq/Fm was still monitored for cuttings stored for 35 days. This was also reflected by visual leaf damage. It is concluded that below a certain threshold value for Fq/Fm, measured 24 h after sticking, the quality of rooted cuttings will be poor.
Christiaens, A., Van Huylenbroeck, J., Gobin, B. and Van Labeke, M.C. (2019). Postharvest quality of ornamental cuttings evaluated by chlorophyll fluorescence. Acta Hortic. 1263, 413-420
chlorophyll fluorescence, Chrysanthemum morifolium, storage, PSII operating efficiency