Stimulation of Striga hermonthica Seed Germination by 11β,13-Dihydroparthenolide

Germination tests of Striga hermonthica seeds were performed using 11β,13-dihydroparthenolide (DHP), a sesquiterpene lactone from Ambrosia artemisifolia (common ragweed). In each test series aqueous solutions with acetone or methanol were used as negative controls. Test solutions of the strigol anal...

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Bibliographic Details
Published inJournal of agricultural and food chemistry Vol. 45; no. 12; pp. 4845 - 4849
Main Authors Rugutt, Joseph K, Rugutt, Kipngeno J
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 01.12.1997
Subjects
AMBROSIA
AMBROSIA ARTEMISIIFOLIA
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
GERMINACION
GERMINATION
LACTONAS
LACTONE
LACTONES
Parasitic plants
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
SEED
SEMENCE
SEMILLAS
SESQUITERPENOID LACTONES
SESQUITERPENOIDE
SESQUITERPENOIDS
SESQUITERPENOS
STRIGA
Seeds
Non host plant
Germination
Natural product
Lactone
Compositae
Crystallography
Structure activity relation
Dicotyledones
Sesquiterpenes
Angiospermae
Molecular model
Plant origin
Scrophulariaceae
Spermatophyta
Ambrosia artemisiifolia
Parasitic plant
Chemical stimulus
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Summary:Germination tests of Striga hermonthica seeds were performed using 11β,13-dihydroparthenolide (DHP), a sesquiterpene lactone from Ambrosia artemisifolia (common ragweed). In each test series aqueous solutions with acetone or methanol were used as negative controls. Test solutions of the strigol analogue 2-methyl-4-((2-oxo-2,3,3a,8b-tetrahydro-4H-indeno[1,2-b]furan-3-ylidene)methoxy)but-2-en-4-olide (GR 24) in methanol as carrier system were used as positive controls. A decrease in concentration of DHP from 10-3 to 10-20 M resulted in several unusual “minima” and “maxima” of stimulatory activities, suggesting that the mode of action of DHP could be hormonal. The crystal structure of DHP was determined by X-ray crystallography, and the use of molecular modeling in predicting the biologically active conformations is proposed. Keywords: Striga hermonthica; Scrophulariaceae; 11β,13-dihydroparthenolide; seed germination; X-ray crystallography; molecular mechanics
Bibliography:F60
1997079753
H60
istex:446A297B2B705651CA6844A26FAA504FA18D6EDA
ark:/67375/TPS-94L15JG5-C
Abstract published in Advance ACS Abstracts, November 1, 1997.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf970420g