DOI: 10.1016/j.foreco.2015.12.010
Scopus记录号: 2-s2.0-84950991095
论文题名: Gene flow from Corymbia hybrids in northern New South Wales
作者: Shepherd M. ; Lee D.J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 362 起始页码: 205
结束页码: 217
语种: 英语
英文关键词: Citriodora
; Eucalyptus
; Introgression
; Myrtaceae
; Spontaneous hybridisation
; Torelliana
Scopus关键词: Crops
; Ecology
; Forestry
; Genes
; Seed
; Tropics
; Citriodora
; Eucalyptus
; Hybridisation
; Introgression
; Myrtaceae
; Torelliana
; Plants (botany)
; Apoidea
; Corymbia (angiosperm)
; Corymbia henryi
; Corymbia torelliana
; Eucalyptus
; Meliponinae
; Myrtaceae
英文摘要: Some of the most productive taxa for forestry are interspecific F1 hybrids grown as exotics in the tropics and subtropics. Attributes of resilience, adaptability and vigour which engender the hybrids for wood production, may also exacerbate the risk they present from gene flow to native species gene pools or to local ecologies as weeds. To determine the biological and genetic factors that influence the extent of hybridisation, we examine the distribution and genealogy of wildlings surrounding plantings of locally-exotic Corymbia torelliana (Section Cadageria) near native C. henryi (Section Maculatae) in northern New South Wales. Our study showed pre-mating and pre- and post-zygotic barriers were incomplete, with in situ generation and natural establishment of both F1 hybrids (n=3) and advanced generation hybrids under the disturbed conditions bordering native forest. As hybrids were located on alluvial flats exposed to frost, they also likely have an extended ecological range relative to native C. henryi. Despite the likely generation of large viable seed crops on F1 trees at the site over many years, establishment success and survival of advanced generation hybrids may be low, as only 5 immature and no mature advanced generation hybrids were identified. Propagation and genetic analysis of a seed crop from one F1 wildling showed early survival and vigour of seedlings in cultivation was high, and that at least for some F1 in some seasons, backcrossing to the recurrent native C. henryi parent is favoured (60%), whereas selfing (10%) and crossing with other F1 (30%) was less frequent. Transport of seed by stingless bees probably accounted for long distance dispersal from C. torelliana, but this mechanism does not appear to supplement gravity-dispersal of seed from the F1. Coupled with other evidence from studies of bee behaviour, controlled pollination in Corymbia sp., and long-term fitness in second generation eucalypt hybrids, we anticipate gene flow via pollen rather than seed will be the greater challenge for managing the risk of introgression of C. torelliana ancestry into native species from the planted F1 hybrid. If large sources of F1 pollen become available to compete with native pollen, gene flow will probably be frequent and hybrids may establish in disturbed conditions and in habitats beyond the ecological range of their native parent. Further study is needed to determine the degree to which outbreeding depression and poor survival inhibits on-going gene flow. © 2015 Elsevier B.V.. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65088
Appears in Collections: 影响、适应和脆弱性
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作者单位: Southern Cross Plant Science and CRC for Forestry, Southern Cross University, PO Box 157, Lismore, NSW, Australia; Forest Industries Research Centre, University of the Sunshine Coast, Department of Agriculture and Fisheries, Locked Bag 4, Maroochydore, QLD, Australia
Recommended Citation:
Shepherd M.,Lee D.J.. Gene flow from Corymbia hybrids in northern New South Wales[J]. Forest Ecology and Management,2016-01-01,362