Interspecific Hybridization within Eucalyptus (Myrtaceae): Subgenus Symphyomyrtus, Sections Bisectae and Adnataria

Delaporte, K.; Conran, John G.; Sedgley, Margaret

doi:10.1086/323276

Cited by 30 publications

(27 citation statements)

References 22 publications

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“…This species pair was also shown to be synchronous by Keatley et al (2004). Separation of flowering time is one mechanism that species employ to avoid hybridisation (Griffin et al 1988;Eldridge et al 1993), hence synchrony between E. leucoxylon and E. tricarpa is unexpected, given also that these species often occur together, are within the same taxonomic series (Pryor and Johnson 1971) and have similar sized flowers (Delaporte et al 2001). Production of E. leucoxylon flowers at Havelock are negatively skewed, but not for E. tricarpa.…”

Section: Discussionmentioning

confidence: 96%

Using Self-Organising Maps (SOMs) to assess synchronies: an application to historical eucalypt flowering records

2011

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Self-Organising Map (SOM) clustering methods applied to the monthly and seasonal averaged flowering intensity records of eight Eucalypt species are shown to successfully quantify, visualise and model synchronisation of multivariate time series. The SOM algorithm converts complex, nonlinear relationships between high-dimensional data into simple networks and a map based on the most likely patterns in the multiplicity of time series that it trains. Monthly- and seasonal-based SOMs identified three synchronous species groups (clusters): E. camaldulensis, E. melliodora, E. polyanthemos; E. goniocalyx, E. microcarpa, E. macrorhyncha; and E. leucoxylon, E. tricarpa. The main factor in synchronisation (clustering) appears to be the season in which flowering commences. SOMs also identified the asynchronous relationship among the eight species. Hence, the likelihood of the production, or not, of hybrids between sympatric species is also identified. The SOM pattern-based correlation values mirror earlier synchrony statistics gleaned from Moran correlations obtained from the raw flowering records. Synchronisation of flowering is shown to be a complex mechanism that incorporates all the flowering characteristics: flowering duration, timing of peak flowering, of start and finishing of flowering, as well as possibly specific climate drivers for flowering. SOMs can accommodate for all this complexity and we advocate their use by phenologists and ecologists as a powerful, accessible and interpretable tool for visualisation and clustering of multivariate time series and for synchrony studies.

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Section: Discussionmentioning

confidence: 96%

Using Self-Organising Maps (SOMs) to assess synchronies: an application to historical eucalypt flowering records

2011

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“…Because of the clearly distinguishable morphological characteristics of F 1 hybrids produced from morphologically distinct parent species in Eucalyptus, reliable morphological identification of F 1 's can typically be conducted (Figure 1, 2, 3;WILTSHIRE and REID, 1987;TIBBITS, 1988;DELAPORTE et al, 2001). The development of morphological monitoring programs aimed at the identification of F 1 hybrids will therefore be an effective tool for identifying sites and species at risk of introgression of exotic plantation genes.…”

Section: Discussionmentioning

confidence: 99%

Gene Flow Between Introduced and Native Eucalyptus Species: Morphological Analysis of Tri-Species and Backcross Hybrids Involving E. nitens

2007

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Summary Morphometric analyses were conducted on second-generation tri-species and backcross hybrids in Eucalyptus. These hybrids were all produced using pollen from two E. nitens x cordata F1 hybrids and controlled pollination techniques. Tri-species hybrids were created with E. gunnii, E. ovata and E. viminalis as females, while backcrosses were produced with E. cordata. Multivariate analysis of seedling characteristics indicated that eighty percent of the backcross hybrids fell within the morphological range of E. cordata. All three cross combinations of the tri-species hybrids were biased away from E. nitens and towards their maternal parent and E. cordata. The inclusion of data for first-generation (F1) hybrids between the pure parental species in the current work showed the F1’s to be easily distinguishable from pure species, compared to second-generation hybrids. The use of morphology for detecting second-generation hybridisation involving exotic plantation species and native eucalypt populations will therefore be unreliable, and identifies a need for preventing second-generation hybrids from establish in the wild. The current work, nevertheless, provides further demonstration of the effectiveness of morphological identification of F1 hybrids. The easy recognition of F1 hybrids will be useful in identifying sites and species at risk of exotic gene flow and enable the development of weeding programs that focus on removing exotic hybrids in the wild.

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“…However, the present study reports the discovery of a new hybrid entity within the Tasmanian biota. Eucalypt species are often highly differentiated in seedling morphology and the general intermediacy of their hybrids makes detection relatively easy (Pryor 1976;Potts andReid 1988, 1990;Tibbits 1988;Delaporte et al 2001;Stokoe et al 2001;Barbour et al 2002). Certainly, all the F 1 hybrid cross-types that were identified appeared to be generally intermediate on visual inspection, although the level of intermediacy varied between trait and hybrid combinations.…”

Section: Discussionmentioning

confidence: 99%

Gene flow between introduced and native Eucalyptus species: exotic hybrids are establishing in the wild

Barbour¹,

Potts²,

Vaillancourt³

2003

Aust. J. Bot.

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Abstract. F 1 hybrids between exotic Eucalyptus nitens plantations and native E. ovata have previously been reported among seedlings grown from open-pollinated seed collected from E. ovata, on the island of Tasmania. Such exotic hybrid seedlings have now been found in the wild adjacent to plantations at three locations. The proportion of exotic hybrids in open-pollinated seed collected from nearby mature E. ovata was 5.5%. This level compares with only 0.4% for natural hybrids between native species at these sites (E. ovata, E. viminalis and E. rodwayi). Detection of hybrids was initially based on their deviant morphology, which was generally intermediate between parental species. This subjective classification was then successfully verified by morphometric and allozyme analyses. Pure E. nitens seedlings (wildlings) were restricted to within 30 m of these plantations, whereas established hybrids were found up to 310 m from the plantations. This pattern of establishment reflects dispersal of exotic seed and pollen respectively. It is likely that the recent expansion of the eucalypt plantation estate in Australia will cause an increase in the frequency of exotic hybrids. However, the long-term impact of such hybridisation is yet to be assessed. B T 0 3 0 1 6 G e n e f l o w b e t w e e n i n t r o d u c e d a n d n a t i v e e u c a l y p t s R . C . B a r b o u r e t a l .

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Interspecific Hybridization within Eucalyptus (Myrtaceae): Subgenus Symphyomyrtus, Sections Bisectae and Adnataria

Cited by 30 publications

References 22 publications

Using Self-Organising Maps (SOMs) to assess synchronies: an application to historical eucalypt flowering records

Using Self-Organising Maps (SOMs) to assess synchronies: an application to historical eucalypt flowering records

Gene Flow Between Introduced and Native Eucalyptus Species: Morphological Analysis of Tri-Species and Backcross Hybrids Involving E. nitens

Gene flow between introduced and native Eucalyptus species: exotic hybrids are establishing in the wild

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