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- W2155156923 abstract "Low seed germination is a major problem in commercial rose propagation and breeding and is species-dependent. The present work selected four rose species previously un-examined to explore effective methods for improving seed germination and the relevant dormancy mechanism and its levels in seven experiments. The results showed that both pulp and achenes from the four rose shrubs had chemical substances that significantly inhibited seed germination with the inhibitory effect was more pronounced in pulp extract than of achenes. Single treatments of H2SO4 scarification, short-term cold stratification (<16 weeks) or warm stratification were less effective in breaking dormancy as indicated by lower germination index than their combinations. Comprehensive comparisons showed that among the six treatments the most effective for breaking dormancy was H2SO4 scarification followed by warm plus cold stratification, then H2SO4 scarification followed by cold stratification and finally warm plus cold stratification. Scarification with H2SO4 for 2–4 h ordinal followed by warm stratification at 20 °C for 4 weeks and cold stratification at 5 °C for 8 weeks was the best pretreatment for increasing seed germination percentage for Rosa multibracteata (81.4 ± 2.9%), Rosa hugonis (13.1 ± 6.0%), and Rosa filipes (62.7 ± 5.7%); and H2SO4 scarification for 4 h followed by cold stratification at 5 °C for 12 weeks was the best pretreatment for Rosa sericea (46.7 ± 8.7%). Our results suggest that these four species have only physiological dormancy caused by integrative roles of pulp, pericarp and embryo. The level of physiological dormancy was ranked as R. hugonis > R. sericea > R. filipes > R. multibracteata." @default.
- W2155156923 created "2016-06-24" @default.
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- W2155156923 date "2011-07-01" @default.
- W2155156923 modified "2023-09-25" @default.
- W2155156923 title "Levels of physiological dormancy and methods for improving seed germination of four rose species" @default.
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- W2155156923 doi "https://doi.org/10.1016/j.scienta.2011.04.024" @default.
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