title: Glucosinolate concentration in turnip (Brassica rapa ssp. rapifera L.) roots as affected by nitrogen and sulfur supply.
abstract: Three greenhouse pot experiments were conducted with four different nitrogen (N) treatments (80, 160, 240, and 320 kg ha (-1)) in combination with three sulfur (S) treatments (10, 20, and 60 kg ha (-1)) to study the effects of combined N and S supply on glucosinolate concentration and composition in turnip roots. Total glucosinolate concentration varied widely from 9.7 (N 320S 10) to 91.6 (N 160S 60) mg (100 g) (-1) root fresh weight (FW) and individual glucosinolate concentrations were increased with increasing S supply regardless of the N treatment, whereas enhanced N supply (160 - 320 N ha (-1)) at the high S level (60 kg ha (-1)) did not affect total glucosinolate concentration. In contrast, assumingly attributed to the individual glucosinolate biosynthesis concentration of N-containing tryptophan-derived indole glucosinolate was highest with increased N supply, whereas S-containing methionine-derived aromatic and aliphatic glucosinolates decreased with increasing N supply combined at low S level (10-20 kg ha (-1)).
authors.affiliation: Resource and Environmental College, Northeast Agricultural University, Harbin, China. lishumin113@yahoo.com.cn
authors.forename: Shumin
authors.initials: S
authors.lastname: Li
authors.forename: Ilona
authors.initials: I
authors.lastname: Schonhof
authors.forename: Angelika
authors.initials: A
authors.lastname: Krumbein
authors.forename: Long
authors.initials: L
authors.lastname: Li
authors.forename: Hartmut
authors.initials: H
authors.lastname: Stützel
authors.forename: Monika
authors.initials: M
authors.lastname: Schreiner
mesh_terms: D029688:Brassica napus / Q000737:chemistry* / Q000254:growth & development*; D005961:Glucosinolates / Q000032:analysis*; D009584:Nitrogen / Q000008:administration & dosage*; D018517:Plant Roots / Q000737:chemistry*; D013455:Sulfur / Q000008:administration & dosage*
chemical_list: D005961:Glucosinolates; D013455:Sulfur; D009584:Nitrogen