Influence of cultivar and fertilizer approach on curly kale (Brassica oleracea L. var. sabellica L.). I. Genetic diversity reflected in agronomic characteristics and phytochemical concentration.
The objectives were to investigate if genetic diversity among field-grown traditional and F1 hybrid kale cultivars were reflected in different agronomic characteristics and consequently glucosinolate (GLS) and flavonoid glycoside concentration. We evaluated how nitrogen (N) and sulfur (S) supply and biomass allocation modified phytochemicals in two experiments with combinations of three cultivars, four N and two S application levels. Results showed less growth and higher N concentration in the traditional cultivar ‚Tiara‘ was associated with increased indole and total GLSs compared to traditional ‚Høj Amager Toftø‘ and F1 hybrid ‚Reflex‘ cultivars, which exhibited higher yield, lower N concentration and different biomass allocation. S application increased total GLS concentration, whereas aliphatic GLS percentage decreased when N application increased. Decrease of six ‚Reflex‘ GLSs besides quercetin glycosides and total flavonoid glycosides with increased N indicated higher N responsiveness for ‚Reflex‘. In conclusion, differences in agronomic characteristics were reflected in diverse phytochemical composition.
Groenbaek, M.; Jensen, S.; Neugart, S.; Schreiner, M.; Kidmose, U.; Lakkenborg Kristensen, H. 2014. Influence of cultivar and fertilizer approach on curly kale (Brassica oleracea L. var. sabellica L.). I. Genetic diversity reflected in agronomic characteristics and phytochemical concentration. Journal of agricultural and food chemistry 62 (47), 11393-11402.