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1991 (1)
1Author    KenjiM. Onde, Mitsuo Takasugi, JennyA. Lewis, G.Roger FenwickRequires cookie*
 Title    Time-Course Studies of Phytoalexins and Glucosinolates in UV-Irradiated Turnip Tissue  
 Abstract    Sliced turnip root (Brassica campestris L. ssp rapa) was irradiated for a total o f 20 min with a 15 W germicidal lamp and the tissue incubated at 25 °C. The effects o f such treatment on indole phytoalexins (methoxybrassinin (I); brassinin (II); cyclobrassinin (III); spirobrassinin (IV) and glucosinolates were determined using high performance liquid chromatography procedures. Accumulation o f phytoalexins I-I I I was evident within 8 h o f irradiation, whilst form ation o f spirobrassinin was evident only after 24 h. M aximal levels o f III and IV (> 100 |ig g " 1 freeze dried tissue) were greater than those o f I and II (27 and 17 jag g ~ \ respec­ tively). The individual glucosinolate levels were affected in a complex manner; whilst most glu-coinolates decreased on storage, the levels o f indole glucosinolates, glucobrassicin (XI) and 1-methoxyglucobrassicin (XIII), increased until 5 to 6 days after irradiation and thereafter declined. Whilst structural features o f I-IV , XI and XIII suggest close biosynthetic relation­ ships between these classes o f biologically-active indoles, further studies are needed to estab­ lish this point unambiguously. 
  Reference    Z. Naturforsch. 46c, 189—193 (1991); received October 11 1990/February 4 1991 
  Published    1991 
  Keywords    G lucosinolate, Phytoalexin, Turnip, UV Irradiation 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0189.pdf 
 Identifier    ZNC-1991-46c-0189 
 Volume    46