Fig. 4.

Germination response of six Brassicaceae species to warm (20 °C) and cold (5 °C) stratification on 1 % (w/v) water agar media for up to 12 weeks. Stratified seeds were subsequently incubated at 20/10 °C for germination, with and without 1 µm KAR₁ (as indicated). (A) Brassica tournefortii, (B) Raphanus raphanistrum, (C) Sisymbrium orientale, (D) S. erysimoides, (E) Heliophila pusilla and (F) Rapistrum rugosum. n = 150 seeds per treatment; vertical bars represent the 95 % confidence interval for binomial estimates.