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Crossability of Eucalyptus globulus


Potts, BM and Savva, M, Crossability of Eucalyptus globulus, Breeding Tropical Trees: Population structure and genetic improvement strategies in clonal and seedling forestry, November, Pattaya, Thailand, pp. 420-422. (1989) [Refereed Conference Paper]

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Copyright 1989 the Authors - The University is continuing to endeavour to trace the copyright owners and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owners.

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Eucalyptus globulus (subgenus Symphyomyrtus; section Maidenaria) is one of the faster growing eucalypts and is widely grown for pulpwood. However, the species is frost sensitive and there is interest in attempting to extend the environmental range of plantations through interspecific hybridisation (Orme, 1988). A study of the crossability of E. globulus was thus undertaken and we here report the success of self-outcross and interspecific pollinations of E. globulus females.

The controlled pollinations undertaken are indicated in Fig. 1. With the exception of E. camaldulensis, pollen species were all from the same section as E. globulus (Maidenaria) and, except for E. ovata and E. brookerana, from the same series (Viminales). Females were mainly ornamental trees growing near Hobart, Tasmania and while their origin is unknown, it is unlikely any females were derived from the same provenance as the E. globulus pollen. Self-pollinations comprised both assisted and unassisted treatments. For assisted self-pollination, flowers were emasculated and self pollen manually applied to the receptive stigmata as in other controlled pollinations. However, in the unassisted treatment flowers were isolated in a bag but not emasculated. lntraspecific outcrosses were either single-pair or polycrosses using a mix of pollen from five trees. Capsules were harvested approximately one year after pollination and the number of viable, inviable and insect eaten seeds were counted from all capsules collected. Seeds were classified as inviable if they were not full or if squashed did not yield a firm white embryo. Seeds eaten by insects were classified as viable. The total number of seed and capsules yielded per flower crossed was determined for each cross and cross-types were compared using individual cross values as replication. Successful interspecific hybridisation has been verified from the morphology of progenies.

Item Details

Item Type:Refereed Conference Paper
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Tree improvement (incl. selection and breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Forestry not elsewhere classified
UTAS Author:Potts, BM (Professor Brad Potts)
UTAS Author:Savva, M (Mr Nicholas Savva)
ID Code:87335
Year Published:1989
Deposited By:Plant Science
Deposited On:2013-11-13
Last Modified:2014-10-02

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