title: Diversity of Kale (Brassica oleracea var. sabellica): Glucosinolate Content and Phylogenetic Relationships.
abstract: Recently, kale has become popular due to nutritive components beneficial for human health. It is an important source of phytochemicals such as glucosinolates that trigger associated cancer-preventive activity. However, nutritional value varies among glucosinolates and among cultivars. Here, we start a systematic determination of the content of five glucosinolates in 25 kale varieties and 11 non-kale Brassica oleracea cultivars by HPLC-DAD-ESI-MS(n) and compare the profiles with results from the analysis of SNPs derived from a KASP genotyping assay. Our results demonstrate that the glucosinolate levels differ markedly among varieties of different origin. Comparison of the phytochemical data with phylogenetic relationships revealed that the common name kale refers to at least three different groups. German, American, and Italian kales differ morphologically and phytochemically. Landraces do not show outstanding glucosinolate levels. Our results demonstrate the diversity of kale and the importance of preserving a broad genepool for future breeding purposes.
authors.affiliation: Institute for Biology and Environmental Sciences, Carl von Ossietzky University Oldenburg , Carl von Ossietzky Strasse 9-11, 26111 Oldenburg, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Hahn
authors.affiliation: School of Engineering and Science, Jacobs University Bremen , Campus Ring 8, Research III, 28759 Bremen, Germany.
authors.forename: Anja
authors.initials: A
authors.lastname: Müller
authors.affiliation: School of Engineering and Science, Jacobs University Bremen , Campus Ring 8, Research III, 28759 Bremen, Germany.
authors.forename: Nikolai
authors.initials: N
authors.lastname: Kuhnert
authors.affiliation: Institute for Biology and Environmental Sciences, Carl von Ossietzky University Oldenburg , Carl von Ossietzky Strasse 9-11, 26111 Oldenburg, Germany.
authors.forename: Dirk
authors.initials: D
authors.lastname: Albach
mesh_terms: D001937:Brassica / Q000145:classification* / Q000235:genetics / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D005961:Glucosinolates / Q000378:metabolism*; D010802:Phylogeny; D020641:Polymorphism, Single Nucleotide; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D005961:Glucosinolates
keywords: HPLC-ESI-MS; KASP assay; SNPs; cabbage; glucosinolates; kale; phylogenetic relationships