Fig. 2.

Striga resistance phenotypes of LGS1 variants. Sorghum seedlings with high Striga germination stimulant activity (A) will germinate conditioned S. asiatica seeds cocultured in agar, a centimeter or more from its root as the germination stimulant, 5-deoxystrigol, diffuses through the medium. Low-stimulant sorghum that exudes orobanchol instead of 5-deoxystrigol will not cause S. asiatica seeds to germinate in the agar gel assay, even very near its roots (B). (Scale bars, 1 mm.) The photograph (C) shows an LGS1 WT high-stimulant sorghum (left) growing next to a line (right) carrying the lgs1-1 allele in a field infested with S. hermonthica (purple flowers) in Ethiopia.