Extending <i>Populus</i> seed longevity by controlling seed moisture content and temperature - Fig 1

Rates of normal seed germination before storage (0 W) and after 1–4 weeks (1 W–4 W) of storage at room temperature for P. davidiana (A) and P. koreana (B). Seed water contents were 3%, 6%, 9%, 12%, 18%, 21%, and 24% (fresh weight basis). Different letters indicate statistically significant differences among five storage periods within each seed water content at p<0.05, according to Duncan’s multiple range test. Vertical bars represent means of four replicates ± SD (n = 4). ***p<0.001.