Germination and seedling survivorship characteristics of hybrids between native and alien species of dandelion (Taraxacum)

Autor: Akihiko Hoya, Hiroyuki Shibaike, Motomi Ito, Tatsuyoshi Morita
Rok vydání: 2004
Předmět:
Zdroj: Plant Species Biology. 19:81-90
ISSN: 1442-1984
0913-557X
DOI: 10.1111/j.1442-1984.2004.00104.x
Popis: Spontaneous hybrids between native and invasive species of Taraxacum were studied by means of seed germination characteristics at 4–34°C and seedling survivorship at 6–36°C. At high (28–34°C) and low (4°C) temperatures, the germination percentage was low in 4X hybrids and T. platycarpum, whereas it was high in 3X hybrids, MP (male partheno genesis) hybrids and T. officinale. When the seeds that did not germinate at high or low temperatures were incubated at 16°C for 10 days, most of the 4X hybrid and T. platycarpum seeds germinated. It was suggested that the germination of 4X hybrid and T. platycarpum seeds was suppressed at high and low temperatures. At 6–24°C, seedlings of all lineages that included T. platycarpum, T. officinale and three type hybrids exhibited a high survivorship of approximately 80–100% and no significant difference was observed between lineages. In contrast, at high temperatures survivorship of 4X hybrid seedlings was significantly higher than that of other lineages, approximately 90% at 31°C and 80% at 36°C. These results suggested that if 4X hybrid competes with T. officinale in hot areas during the seedling period, 4X hybrid would have the advantage over T. officinale, whose seedlings could not survive under high temperatures.
Databáze: OpenAIRE
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