Environmental effects on germination of Carex utriculata and Carex nebrascensis relative to riparian restoration
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Published source details
Jones K.L., Roundy B.A., Shaw N.L. & Taylor J.R. (2004) Environmental effects on germination of Carex utriculata and Carex nebrascensis relative to riparian restoration. Wetlands, 24, 467-479.
Published source details Jones K.L., Roundy B.A., Shaw N.L. & Taylor J.R. (2004) Environmental effects on germination of Carex utriculata and Carex nebrascensis relative to riparian restoration. Wetlands, 24, 467-479.
Actions
This study is summarised as evidence for the following.
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Chill seeds of non-woody plants before sowing: freshwater wetlands Action Link |
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Physically damage seeds of non-woody plants before sowing: freshwater wetlands Action Link |
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Chill seeds of non-woody plants before sowing: freshwater wetlands
A replicated, randomized, paired, controlled study in 1997 in a laboratory in Utah, USA (Jones et al. 2004) found that chilling sedge Carex spp. seeds before sowing typically had no significant effect on their germination rate, although the precise effect depended on the species and the light/temperature regime after sowing. The germination rate of chilled and unchilled seeds was statistically similar in 22 of 36 comparisons (for which chilled: 0–98%; unchilled: 0–96%). This included 13 of 18 comparisons of seeds germinating in the dark, and 11 of 12 comparisons of seeds germinating in summer temperatures. Chilling significantly increased the germination rate in the other 14 of 36 comparisons (for which chilled: 17–86%; unchilled: 0–32%). This included six of six comparisons of seeds germinating in the light in spring temperatures. Methods: Two-year-old seeds of beaked sedge Carex utriculata and Nebraska sedge Carex nebracensis were sown into a total of 384 petri dishes (192 dishes/species; 32 seeds/dish), then incubated in the laboratory. Seeds in 288 dishes were chilled before sowing (moist incubation at 5°C for 7, 30 or 150 days). Seeds in the other 96 dishes were not chilled. Dishes were allocated to various other treatments (including germination in light vs dark and different post-sowing temperature regimes). Each incubator shelf received four random dishes of each treatment combination. Germination rates, as a percentage of viable seeds, were recorded for each dish 36 days after sowing.
(Summarised by: Nigel Taylor)
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Physically damage seeds of non-woody plants before sowing: freshwater wetlands
A replicated, randomized, paired, controlled study in 1997 in a laboratory in Utah, USA (Jones et al. 2004) found that removing the sac-like coating of sedge Carex spp. seeds before sowing never reduced the germination rate, although the precise effect depended on light conditions after sowing. In three of three comparisons involving seeds germinating in light, exposed seeds had a higher germination rate (43–95%) than seeds still in their sac (26–88%). In two of three comparisons involving seeds germinating in the dark, exposed seeds had a statistically similar germination rate (2–12%) to seeds still in their sac (1–8%). In the other comparison, exposed seeds had a higher germination rate (40%) than seeds still in their sac (31%). Methods: Two-year-old seeds of beaked sedge Carex utriculata and Nebraska sedge Carex nebracensis were sown into a total of 384 petri dishes (192 dishes/species; 32 seeds/dish), then incubated in the laboratory. In 192 random dishes, the sac-like coating of the seeds had been removed by tumbling the seeds in sandpaper. In the other 192 dishes, the coating had not been removed. Dishes were allocated to various other treatments (including germination in light vs dark, and different pre- and post-sowing temperature regimes). Each incubator shelf received four random dishes of each treatment combination. Germination rates, as a percentage of viable seeds, were recorded for each dish 36 days after sowing.Environmental effects on germination of
(Summarised by: Nigel Taylor)
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