Document Detail

Conversion of 5-(1,2-epoxy-2,6,6-trimethylcyclohexyl)-3-methylpenta-cis-2-trans-4-dienoic acid into abscisic acid in plants.
MedLine Citation:
PMID:  5493506     Owner:  NLM     Status:  MEDLINE    
(+/-)-5-(1,2-Epoxy-2,6,6-trimethylcyclohexyl) -3-methyl[2-(14)C]penta-cis-2-trans-4-dienoic acid is converted into abscisic acid by tomato fruit in 1.8% yield (or 3.6% of one enantiomer if only one is utilized) and 15% of the abscisic acid is derived from the precursor. The 2-trans-isomer is not converted. The amounts of [2-(3)H]mevalonate incorporated into abscisic acid have shown that the 40-times higher concentration of (+)-abscisic acid in wilted wheat leaves in comparison with unwilted ones reported by Wright & Hiron (1969) arises by synthesis. The conversion of (+/-)-5-(1,2-epoxy-2,6,6-trimethylcyclohexyl) -3-methyl-[2-(14)C]penta-cis-2-trans-4-dienoic acid into abscisic acid by wheat leaves is also affected in the same way by wilting and it is concluded from this that the epoxide or a closely related compound derived from it is on the biosynthetic pathway leading to abscisic acid. The oxygen of the epoxy group was shown, by (18)O-labelling, to become the oxygen of the tertiary hydroxyl group of abscisic acid.
B V Milborrow; R C Noddle
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Biochemical journal     Volume:  119     ISSN:  0264-6021     ISO Abbreviation:  Biochem. J.     Publication Date:  1970 Oct 
Date Detail:
Created Date:  1971-02-27     Completed Date:  1971-02-27     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  2984726R     Medline TA:  Biochem J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  727-34     Citation Subset:  IM    
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MeSH Terms
Carbon Isotopes
Ethers, Cyclic / metabolism*
Mevalonic Acid / metabolism
Oxygen Isotopes
Plant Growth Regulators / biosynthesis*
Plants / metabolism*
Reg. No./Substance:
0/Carbon Isotopes; 0/Ethers, Cyclic; 0/Oxygen Isotopes; 0/Plant Growth Regulators; 10028-17-8/Tritium; 150-97-0/Mevalonic Acid

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