Table 2 ANOVA of the effect of storage time (0, 12 months), storage temperature (10°, −3°, −20 °C, −196 °C) and water content on P. nigra seed germination. Seeds had a WC of 0.15 g g⁻¹ (non-desiccated) or 0.07 g g ⁻¹ (desiccated). ANOVA mixed model with “tree” as a random effect. Seeds from harvest in 2011. WC Water content

From: Optimal seed water content and storage temperature for preservation of Populus nigra L. germplasm