Components and Concentration of Glucosinolates in Shoots and Roots of Different Turnip Cultivars

The components and concentration of glucosinolates(GSs)in shoots and roots of two turnip(Brassica campestris L.ssp.rapifera Metzg)cultivars('Hongyuan'and'Baiyu')were identified and analyzed by ISO9167-1:1992(E)HPLC international standards method.The appearance and taste of the two cultivars are different.The same components of GSs were identified in both cultivars,including 6 aliphatic GSs,progoitrin,glucoraphanin,gluconapoleiferin,glucoalyssin,gluconapin and glucobrassicanapin,the aromatic GS,gluconasturtiin,and 3 indole GSs,4-hydroxyglucobrassicin,4-methoxyglucobrassicin and neoglucobrassicin.The total GSs concentration in shoots and roots of'Hongyuan'were 12.13 and 11.25 μmol·g-1 DW,while the total GSs concentrations in shoots(49.98 μmol·g-1 DW)was one and half times than that in roots(33.43 μmol·g-1 DW)of'Baiyu',respectively.The significantly higher total GSs content in'Baiyu'than that in'Hongyuan'because of the higher concentration of aliphatic GSs,especially gluconapin in'Baiyu'was higher than in'Hongyuan'.The proportion of aliphatic GSs in shoots and roots of'Hongyuan'was lower than that in'Baiyu',but the proportion of indole and aromatic GSs in'Hongyuan'was higher than that in'Baiyu'.