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Joined 2026-09-21 Message
Incoming links: Strigol
C. E. Cook 2026-11-05
C. E. Cook is the first author of a 1966 study isolating strigol, a chemical that stimulates germination in the root-parasitic plant Striga. The team obtained crystalline material from cotton root exudates and connected the purified compound to a biological response.[ref]
Germination of Witchweed (Striga lutea Lour.): Isolation and Properties of a Potent Stimulant by C. E. Cook and others. Original byline and Abstract: isolation and germination stimulation
The experiment separated an active substance from a complex mixture. Activity in the original exudate could have arisen from many compounds; obtaining a defined crystalline stimulant allowed the response to be associated with a more specific chemical candidate.[ref]
Germination of Witchweed (Striga lutea Lour.): Isolation and Properties of a Potent Stimulant by C. E. Cook and others. Abstract: crystalline strigol isolated from cotton exudates
The readout was germination. It did not by itself demonstrate subsequent attachment, invasion or successful growth of the parasite on cotton. Distinguishing an initiating cue from the complete biological interaction prevents an assay result from being mistaken for proof of host compatibility.
Strigol 2026-11-05
Strigol is a particular strigolactone identified as a chemical stimulant of germination in root-parasitic plants. A 1966 study isolated crystalline strigol from cotton root exudates and reported its molecular formula as . The substance is one identified molecule, whereas strigolactone names a broader chemical family.[ref]
Germination of Witchweed (Striga lutea Lour.): Isolation and Properties of a Potent Stimulant by C. E. Cook and others. Abstract; cotton-root exudates, isolation, formula and germination activity
The motivating experiment links chemical separation with a biological assay. An active root-exudate fraction can be purified and tested for its capacity to stimulate seeds; chemical identification then connects that activity with a defined compound. Germination is the measured outcome. It does not by itself establish successful attachment to a host or later growth of the parasite.
An invented dilution calculation illustrates why a small amount and a small concentration are different descriptions: in is . A tenfold dilution gives while also changing the delivered amount if the assay volume is fixed. These are teaching values, not thresholds reported by the1966 study. A germination comparison must state its concentration, conditions and control treatment.