• The Korean Journal of Ecology
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• v.16 no.2
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• pp.135-149
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• 1993

In order to study and ecotypic variation of Phragmites communis Trin., we investigated germination rates, velocities, and protein band patte군 of seeds of three population of salt marsh, estuary and fresh water areas of Muan Peninsular in southwestern coast of Korea from March, 1990 to October, 1992. The highest germination rates of seeds were observed at $25^{\circ}C$; those of population of the estuary and fresh water are were 100% and that of the salt marsh was 95%. Similar germination rates were observed from the populations of estuary and fresh water areas at $30^{\circ}C$ and $20^{\circ}C$, but they decreased at $15^{\circ}C$. The onset of germination of seeds of three population was earlier $^{\circ}C$, but they decreased at $15^{\circ}C$. The onset of germination of seeds of th three populations was earlier at both $25^{\circ}C$, which was higher than those of any other areas, while that of fresh water areas was the lowest. were different; those of salt marsh and estuary decreased to 30% and 2.5%, respectively, at 3.0% of salt content, but seeds of the fresh water area did not germinate at all at the same salt content. The onset of germination was delayed in the order of the salt marsh, esturay and fresh water areas as salt content of culture solution increased. Germination of seeds from the population of salt marsh was found to begin earliest. The highest germination velocity of three populations was observed in the culture containing no salt. The germination velocity constant decreased as salt content of culture solution increased from 0.5% to 3.0%: those of the populations of the salt marsh, estuary, and fresh water areas were 9.50, 0.75 and 0.00, respectively, at the salt concentration of 3.0%. Soluble protein patterns of seedings from the three populations were analyzed by SDS-PAGE method. The results showed that protein patterns of the three populations were distinctly different qualitatively and quantitatively. The present study suggests that populations of Phragmites communis Trin. in the coast of Korea had taken ecotypic variations of habitats, i.e., fresh water, estuary, and salt marsh types, according to the salt content.