Fig. 4.
From: What are karrikins and how were they ‘discovered’ by plants?
Germination of Arabidopsis seeds and growth of seedlings in response to karrikin. Arabidopsis thaliana seeds with primary dormancy incubated for seven days on water-agar without karrikin (KAR) germinate very poorly whereas those with KAR germinate readily (top row). Seedlings germinated on nutrient medium and grown in low light for seven days without KAR have long hypocotyls whereas those with KAR have short hypocotyls and larger cotyledons (bottom row). Images from the author’s laboratory