Reciprocal and advanced generation hybrids between Corymbia citriodora and C. torelliana: Forestry breeding and the risk of gene flow

Geoffrey R Dickinson; Helen M Wallace; David J Lee

doi:10.1007/s13595-012-0231-2

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Reciprocal and advanced generation hybrids between Corymbia citriodora and C. torelliana: Forestry breeding and the risk of gene flow

Journal article

Peer reviewed

Reciprocal and advanced generation hybrids between Corymbia citriodora and C. torelliana: Forestry breeding and the risk of gene flow

Geoffrey R Dickinson, Helen M Wallace and David J Lee

Annals of Forest Science, Vol.70(1), pp.1-10

2013

DOI: https://doi.org/10.1007/s13595-012-0231-2

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Abstract

backcross

corymbia

gene flow

genetic pollution

hybrid

isolation

Context: Corymbia F1 hybrids have high potential for plantation forestry; however, little is known of their reproductive biology and potential for genetic pollution of native Corymbia populations. • Aims: This study aims to quantify the influence of reproductive isolating barriers on the success of novel reciprocal and advanced generation Corymbia hybrids. • Methods: Two maternal taxa, Corymbia citriodora subsp. citriodora and Corymbia torelliana, were pollinated using five paternal taxa, C. citriodora subsp. citriodora, C. torelliana, one C. torelliana × C. citriodora subsp. citriodora hybrid and two C. torelliana × C. citriodora subsp. variegata hybrids. Pollen tube, embryo and seed development were assessed. • Results: Reciprocal hybridisation between C. citriodora subsp. citriodora and C. torelliana was successful. Advanced generation hybrids were also created when C. citriodora subsp. citriodora or C. torelliana females were backcrossed with F1 hybrid taxa. Prezygotic reproductive isolation was identified via reduced pollen tube numbers in the style and reduced numbers of ovules penetrated by pollen tubes. Reproductive isolation was weakest within the C. citriodora subsp. citriodora maternal taxon, with two hybrid backcrosses producing equivalent capsule and seed yields to the intraspecific cross. • Conclusions: High hybridising potential was identified between all Corymbia species and F1 taxa studied. This provides opportunities for advanced generation hybrid breeding, allowing desirable traits to be amplified. It also indicates risks of gene flow between plantation and native Corymbia populations

Details

Title: Reciprocal and advanced generation hybrids between Corymbia citriodora and C. torelliana: Forestry breeding and the risk of gene flow
Authors: Geoffrey R Dickinson (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Helen M Wallace (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
David J Lee (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Publication details: Annals of Forest Science, Vol.70(1), pp.1-10
Publisher: Springer France
Date published: 2013
DOI: 10.1007/s13595-012-0231-2
ISSN: 1286-4560
Organisation Unit: School of Science and Engineering - Legacy; Tropical Forests and People Research Centre; University of the Sunshine Coast, Queensland; GeneCology Research Centre - Legacy; Forest Industries Research Centre; Forest Research Institute
Language: English
Record Identifier: 99450389902621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Forestry