Table 1. Effect of cold stratification on germination of 0- and 6-mo-old dry-stored silicles of Isatis violascens incubated at 5/2 and 15/2°C in light (mean ± 1 s.e.).

Different uppercase letters within a row indicate significant differences between the two temperature regimes and different lowercase letters within a column significant differences among the different treatments.

	Weeks of cold stratification	Final germination (%) of silicles at 5/2°C	Final germination (%) of silicles at 15/2°C
0-months of storage	0	0.0±0.0 Aa	0.0±0.0 Aa
	4	0.0±0.0 Aa	0.0±0.0 Aa
	8	22.0±4.7 Bb	4.0±0.0 Aa
	12	20.6±2.7Bb	5.3±0.9Aa
6-months of storage	0	1.0±1.0 Aa	0.0±0.0 Aa
	4	56.0±8.6Bc	15.0±3.4Ab
	8	77.5±6.6Bd	42.5±4.3Ac
	12*	-*	-*

* Most seeds (98%) germinated during cold stratification at 4°C.