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http://dx.doi.org/10.5660/KJWS.2010.30.2.084

Germination and Seedling Emergence of Ammannia coccinea as Influenced by Environmental Factors  

Shen, Xiangri (Department of Crop Science, Chungnam National University)
Pyon, Jong-Yeong (Department of Crop Science, Chungnam National University)
Kim, Do-Soon (Department of Plant Science, Seoul National University)
Publication Information
Korean Journal of Weed Science / v.30, no.2, 2010 , pp. 84-93 More about this Journal
Abstract
Petri dish and pot experiments were conducted to investigate germination and seedling emergence of Ammannia coccinea as influenced by environmental factors. The best germination of A. coccinea was obtained at $35/30^{\circ}C$ of temperature and 0 bar of osmotic potential, while no germination at temperatures of ${\leq}$ $15^{\circ}C$ and ${\geq}$ $40^{\circ}C$, osmotic potentials of ${\leq}$ -2.0 bar, or dark condition. The best seedling emergence was observed at $35/30^{\circ}C$, at which the first emergence of A. coccinea was observed at 7 days after sowing (DAS) with its maximum emergence reached at 10 DAS. No seedling emergence was observed at $15/10^{\circ}C$ with significant reduction at $40/35^{\circ}C$. Seedling emergence decreased with increasing soil depth, resulting in no seedling emergence at ${\geq}$ 3 cm. The Gompertz model well described the cumulative germination and seedling emergence of A. coccinea with time. Germination influenced by osmotic potential and seedling emergence influenced by soil burial depth were well described by the logistic model. Overall results indicate that A. coccinea is photoblastic and requires temperatures greater than $15^{\circ}C$, osmotic potential greater than -2.0 bar, and soil burial depth shallower than 3 cm for its germination and seedling emergence, which were faster than M. vaginalis but slower than E. crus-galli.
Keywords
Ammannia coccinea; germination; Gompertz model; osmotic potential; seedling emergence; soil depth; temperature;
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