Germination Stimulants of Witchweed (Striga asiatica) from Hydrophobic Root Exudate of Sorghum (Sorghum bicolor)

Hydrophobic exudate from roots of sorghum [Sorghum bicolor (L.) Moench. #3 SORVU ‘IS 8768’] contain four p-benzoquinones which in the dihydroquinone form are active as germination stimulants of witchweed [Striga asiatica (L.) Kuntz. # STRLU]. The three minor p-benzoquinones were partially characteri...

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Bibliographic Details
Published in:Weed science 1988-07, Vol.36 (4), p.441-446
Main Authors: Netzly, David H., Riopel, James L., Ejeta, Gebisa, Butler, Larry G.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Corn
EXSUDATION
EXUDACION
Fundamental and applied biological sciences. Psychology
GERMINACION
GERMINATION
Parasitic plants
Parasitic plants. Weeds
Physiology, Chemistry and Biochemistry
Phytopathology. Animal pests. Plant and forest protection
Plant roots
Plants
PROMOTEUR DE CROISSANCE
PROMOTORES DEL CRECIMIENTO
QUINONAS
QUINONE
Quinones
RACINE
RAICES
Root exudates
Seedlings
Soil chemistry
Sorghum
SORGHUM BICOLOR
Stimulants
STRIGA
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Summary:Hydrophobic exudate from roots of sorghum [Sorghum bicolor (L.) Moench. #3 SORVU ‘IS 8768’] contain four p-benzoquinones which in the dihydroquinone form are active as germination stimulants of witchweed [Striga asiatica (L.) Kuntz. # STRLU]. The three minor p-benzoquinones were partially characterized and found to be structurally similar to sorgoleone, the major p-benzoquinone of this exudate. Herbicidal activity of the hydrophobic exudate was due to concentration- and pH-dependent inhibition of root elongation in some but not all weeds tested. Witchweed has apparently adapted these “defense” compounds of sorghum as host-specific germination stimulants.
ISSN:0043-1745
1550-2759
DOI:10.1017/s0043174500075172