Fig. 5
From: Optimal seed water content and storage temperature for preservation of Populus nigra L. germplasm
Effect of seed storage conditions on the germination of P. nigra seeds. a Interaction between seed WC (fresh 0.15 g g−1 and dried 0.07 g g−1) and time of storage (not stored or stored 12 months). b Interaction between temperature (10 °C, 3 °C, −20 °C, −196 °C) and seed WC (fresh and dried). c Interaction between temperature and time of storage (not stored or stored 12 months). Means with the same letters are not significantly different (P < 0.05). Seeds were collected in 2011