Extending <i>Populus</i> seed longevity by controlling seed moisture content and temperature - Fig 3

Effects of storage temperature at 4°C (■), -18°C (▲), and -80°C (●) on normal germination in P. koreana seeds stored for up to 48 months with water contents adjusted to 3% (A), 6% (B), 9% (C), 12% (D), 18% (E), 21% (F), or 24% (G) (fresh weight basis). Storage temperature (ST) ***, seed water content (SWC) ***, storage period (SP) ***, ST × SWC **, ST × SP ***, SWC × SP ***, ST × SWC × SP ns. All values are means of four replicates ± SD (n = 4). ** and *** indicate significant difference at pns indicates non-significance.