Naslov
Pollen germination and pollen tube growth in Fraxinus pennsylvanica

Autori
Kremer, Dario ; Jemrić, Tomislav

Izvornik
Biologia, Bratislava (0006-3088) 61 (2006), 1; 79-83

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
green ash pollen; exotic species; ecology; pollen germination; pollen tube growth

Sažetak
With regard to adaptation of green ash (Fraxinus pennsylvanica MARSHALL) to ecological conditions in Croatia, pollen germination and pollen tube length after 2, 4 and 6 hours were examined in vitro at 10, 15, 20 and 25 °C during two years 2001 and 2002. Narrow leaved ash (F. angustifolia VAHL) pollen served as a control in 2002. The year, time and temperature, and the interaction between time and temperature were signi.cant for both germination percentage and pollen tube length. Interactions year × temperature and year × time were signi.cant for pollen tube length only. The highest germination percentage (17.86% in 2001 and 19.40% in 2002) of green ash pollen was at 15 °C after 6 hours. The pollen tube length was greatest at 20 °C (393.46 &micro ; ; m) in 2001 and 25 °C (899.50 &micro ; ; m) in 2002 after 6 hours. Narrow leaved ash pollen had the highest germination percentage (19.22%) at 20°C after 6 hours and was significantly reduced at 25.C. The pollen tube length was greatest at 25 °C (518.90 &micro ; ; m) after 6 hours. It can be concluded that green ash pollen has satisfactory germination in ecological conditions in Croatia and that the optimum temperature for pollen germination is higher than 20 °C.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija), Šumarstvo

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