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- W2365213613 abstract "Mechanisms that regulate seed germination through environment factors are important aspects of a species' life history. The response of seed germination to environment was a main character for plant in its life history. Changium smyrnioides Wolff is an endangered species in Umbellaceae, and its seedlings are rare in natural habitat. Anthriscus sylvestris (L.) Hoffm. is a non-endangered species belongs to the same family, its distribution area is wide and the seedlings are numerous in habitats. In this study we experimentally investigated how the environmental factors influence the seed germination of the two species. Seeds were collected from the natural habitat, South Peak (120°06'E, 30°13'N) near Hangzhou city. Seeds of both species matured in June, then were in dormancy during summer, autumn and winter, and began germination in early spring. Results showed that temperature was a main factor affecting the seed germination of the winter-growing species like C. smyrnioides and A. sylvestris. The germination temperature ranges of the both species were between 5℃ and 15℃. Germination of two species seeds were restrained at 15℃, and almost stopped at 18℃. The optimal temperature for seed germination of C. smyrnioides was 10℃, and the average germination was 79.9%; while the optimal temperature for A. sylvestris was 5℃, and the average germination was 85.2%. The seed germination was correlated negatively to temperature from 5℃ to 18℃. The change of daily temperature also affected seed germination, and the germination increased with daily variety of temperature. Light was not a significant factor for the germination, both of the two species seeds were not light sensitive, and there was little difference for germination in light and in dark: 75.5% and 71.5% for C. smyrnioides and 68.0% and 67.5% in light and in dark, respectively. C. smyrnioides seeds lost their availability more easily than A. sylvestris in natural habitat, the reason should be the moisture of the habitat: the optimal seed water content of C. smyrnioides (5.9%～6.4%) was higher than A. sylvestris (3.7%). The seed mass of C. smyrnioides was bigger than A. sylvestris, but seed number per mother plant was less than A. sylvestris. From the results, it can be deduced that the difference of germination characters of the two species is not obvious, and the germination process of C. smyrnioides is not the reason for it's endangernet. Low seed production was a weakness for population generation of the endangered species." @default.
- W2365213613 created "2016-06-24" @default.
- W2365213613 creator A5041681981 @default.
- W2365213613 date "2004-01-01" @default.
- W2365213613 modified "2023-09-25" @default.
- W2365213613 title "Influence of environmental factors on seed germination of two species in Umbellaceae" @default.
- W2365213613 hasPublicationYear "2004" @default.
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