Micropropagation of the endangered Chilean tree, Gomortega keule View Full Text


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Article Info

DATE

2011-02

AUTHORS

Diego Muñoz-Concha, Michael R. Davey

ABSTRACT

The endangered tree Gomortega keule remains only in small, isolated populations surrounded by timber plantations in the biodiversity hotspot of central Chile. This species, belonging to the monotypic family Gomortegaceae, produces edible fruit and high-quality wood, but its difficult propagation makes conservation essential. The percentage of seed germination is less than 40%, germination time exceeds 12 mo, and cuttings fail to root. These difficulties have stimulated efforts to explore in vitro approaches for propagation. Cultures were established from zygotic embryos; the optimum culture conditions for shoot proliferation were semi-solid Woody Plant Medium (WPM) with 20 g/l sucrose, 0.1 mg/l α-naphthaleneacetic acid and 1.0 mg/l 6-benzylaminopurine, at 18°C. Explants required about 12 mo in culture before stabilized growth resulted in consistent shoot production. Regenerated shoots excised from parental explants developed a normal morphology 1 mo after transfer to WPM with 2.0 g/l of activated charcoal, and lacking plant growth regulators. These normal shoots were rooted with a treatment of 7 d on WPM without activated charcoal, but containing 20 mg/l indole-3-butyric acid, followed by return to the same medium with 2.0 g/l activated charcoal, without growth regulators, for 1 mo. Regenerated plants were transferred to compost and covered with transparent plastic sleeves. The latter were opened gradually to decrease humidity and to establish plants under glasshouse conditions. There is an urgent requirement to extend this protocol to material collected from diverse sites and to introduce micropropagated specimens into the wild and living plant repositories to conserve this endangered species. More... »

PAGES

170-175

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11627-010-9331-6

DOI

http://dx.doi.org/10.1007/s11627-010-9331-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1046899196


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