Results

Although germination responses were highly species specific regarding moisture treatment (species X treatment, P = 0.011), they were similar between the two species across the timed exposures (species factor, P = 0.296; species X time, P = 0.052; species X light X time, P = 0.108). Germination across the timed exposures was different between the two moisture treatments for P. perforata (treatment factor, P = 0.006; time factor, P < 0.001; treatment X time, P < 0.001) and P. stonensis (treatment factor, P = 0.317; time factor, P < 0.001; treatment X time, P < 0.001).

Seeds of P. perforata germinated to 4—15%, 40% and 54—61% in darkness when exposed to 0-10, 12 and 14-16 weeks of light, respectively, starting from May on an alternating wet/dry substrate, and they germinated to 3-8% and 19-29% in darkness when exposed to 0-4 and 6-16 weeks of light, respectively, on continuous moisture (Table 38.1). P. stonensis seeds germinated to 2-17% and 39-48% in darkness when exposed to 0-12 and 14-16 weeks of light, respectively, on an alternating wet/dry substrate, and they germinated to 3-13% and 23-37% in darkness when exposed to 0-6 and 8-16 weeks of light, respectively, on continuous moisture (Table 38.2). For both species, seeds in the light controls germinated to 67-86% and 42-47% on alternating wet/dry and constantly wet substrates, respectively.

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