Strigol (source code)
= Strigol
<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 $\mathrm{C_{19}H_{22}O_6}$. The substance is one identified molecule, whereas <strigolactone> names a broader chemical family.<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]{ref}
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: $1\,\mathrm{pmol}$ in $1\,\mathrm{mL}$ is $1\,\mathrm{nM}$. A tenfold dilution gives $0.1\,\mathrm{nM}$ 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.
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