Pathogens of the Wollemi pine, Wollemia nobilis

Bullock, Stephen H.; Summerell, Brett A.; Gunn, L. V.

doi:10.1071/ap00037

Cited by 21 publications

(15 citation statements)

References 4 publications

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“…The tree is known to be host to several different endophytes, both in the wild (Strobel et al . 1997) and in cultivation (Bullock et al . 2000), with little evidence for pathogenicity.…”

Section: Discussionmentioning

confidence: 99%

Comparative genetic study confirms exceptionally low genetic variation in the ancient and endangered relictual conifer, Wollemia nobilis (Araucariaceae)

et al. 2003

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The Wollemi pine, Wollemia nobilis (Araucariaceae), was discovered in 1994 as the only extant member of the genus, previously known only from the fossil record. With fewer than 100 trees known from an inaccessible canyon in southeastern Australia, it is one of the most endangered tree species in the world. We conducted a comparative population genetic survey at allozyme, amplified fragment length polymorphism (AFLP) and simple sequence repeat (SSR) loci in W. nobilis, Araucaria cunninghamii and Agathis robusta - representatives of the two sister genera. No polymorphism was detected at 13 allozyme loci, more than 800 AFLP loci or the 20 SSR loci screened in W. nobilis. In Ag. robusta only one of 12 allozyme loci, five of 800 AFLP loci and none of the 15 SSR loci were variable. For A. cunninghamii, 10 of > 800 AFLP loci and five of 20 SSR loci were variable. Thus low genetic diversity characterizes all three species. While not ruling out the existence of genetic variation, we conclude that genetic diversity is exceptionally low in the Wollemi pine. To our knowledge this is the most extreme case known in plants. We conclude that the combination of small population effects, clonality and below-average genetic variation in the family are probable contributing factors to the low diversity. The exceptionally low genetic diversity of the Wollemi pine, combined with its known susceptibility to exotic fungal pathogens, reinforces current management policies of strict control of access to the pines and secrecy of the pine locations.

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“…The tree is known to be host to several different endophytes, both in the wild (Strobel et al . 1997) and in cultivation (Bullock et al . 2000), with little evidence for pathogenicity.…”

Section: Discussionmentioning

confidence: 99%

Comparative genetic study confirms exceptionally low genetic variation in the ancient and endangered relictual conifer, Wollemia nobilis (Araucariaceae)

et al. 2003

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“…Current threats to the population include stochastic genetic effects associated with small population size, fire (which may ironically also promote colonisation), increased seed predation due to small population size (which lowers the effectiveness of the Bunya's strategy of mass seed production, which occurs approximately every three years), cyclones, pathogens (a significant threat identified for Wollemia nobilis, Araucariaceae (Bullock et al 2000)) and other stochastic environmental threats. Given the strong divergence detected here between northern and southern populations, an additional threat may be posed by outbreeding depression (Young et al 1996).…”

Section: Regional Differentiation In Bunyasmentioning

confidence: 99%

Genetic diversity, differentiation and conservation in Araucaria bidwillii(Araucariaceae), Australia's Bunya pine

Pye

Gadek

2004

Conservation Genetics

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“…It is considered one of the rarest Australian rainforest tree species and exists in several mature stands in a remote canyon 150 km north-west of Sydney, NSW. There are fewer than 100 adult trees in the wild, and the species is highly susceptible to Phytophthora cinnamomi (Bullock et al 2000). Despite the relative ease of germination of seeds of this species (Offord and Meagher 2001), few seeds are produced, and they are difficult to harvest .…”

Section: Wollemia Nobilismentioning

confidence: 99%

Conservation technologies for safeguarding and restoring threatened flora: case studies from Eastern Australia

Ashmore

Hamilton

Offord

2010

In Vitro Cell.Dev.Biol.-Plant

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This paper highlights recent advances and improved scientific understanding of conservation technologies through selected case studies on threatened plant species indigenous to Eastern Australia. This includes investigations into seed desiccation, storage responses and cryopreservation in rainforest species, particularly the socio-economically important Australian native Citrus spp., Davidsonia spp. (Davidson's plum) and Syzygium spp. This work also (1) increases our understanding of ecological correlates of seed desiccation sensitivity for predictive use and (2) improves restoration practice through better understanding of seed storage and germination requirements. The use of in vitro conservation technologies in support of conservation actions for endangered species is outlined in case studies on Wollemia nobilis (Wollemi pine), epiphytic and terrestrial orchid species, and an endangered fern species.

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Pathogens of the Wollemi pine, Wollemia nobilis

Cited by 21 publications

References 4 publications

Comparative genetic study confirms exceptionally low genetic variation in the ancient and endangered relictual conifer, Wollemia nobilis (Araucariaceae)

Comparative genetic study confirms exceptionally low genetic variation in the ancient and endangered relictual conifer, Wollemia nobilis (Araucariaceae)

Genetic diversity, differentiation and conservation in Araucaria bidwillii(Araucariaceae), Australia's Bunya pine

Conservation technologies for safeguarding and restoring threatened flora: case studies from Eastern Australia

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