Regeneration of the Wollemi pine (Wollemia nobilis)
2000
Kramer, H.
Wollemia nobilis recently discovered (December 1994) is the rarest tree species of the world. The two populations of this species in the Blue Mountains north west of Sydney consist of 38 adult trees, some small seedlings and only few saplings. Mortality of the seedlings is very high. - The study of the Mount Annan botanical garden on seed biology and early plant growth is important for the regeneration and survival of Wollemi pine (Offord et al. 1999). The female cones mature 16-19 month after pollination (in spring = October/November) in late summer and autumn of the next year. Approximately 10% of the annually produced seed are viable. Under glasshouse conditions at 25 degrees C (day) and 16 degrees C (night) germination proceeded steadily until (after half a year) 88% of apparently viable seed had germinated. The remains were rotten. - During the observation period of 3 years the potted seedlings attained a total height of 0.8 m - 1.2 m. The diameter just above the soilreached 2.5 cm - 3.5 cm. In this time the young plants produced a total of 60 - 77 lateral branches. - Experiments with vegetative propagation were successful, using cuttings from epicormic growth and mature shoots, and shoots explants in sterile tissueculture media.
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