Reproductive biology of<i>Corymbia citriodora</i>subsp.<i>variegata</i>and effective pollination across its native range in Queensland, Australia

Bacles, Cecile F. E.; Brooks, Jennifer; Lee, David J; Schenk, Peer M.; Lowe, Andrew J.; Kremer, Antoine

doi:10.2989/sf.2009.71.2.7.822

Cited by 17 publications

(20 citation statements)

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“…In a study by McCoy (1990) it was revealed that flying foxes (P. alecto and P. scapulatus) carry large volumes of viable pollen grains on their fur, which when transferred to receptive stigmas of the eucalypt species E. porrecta and E. confertiflora resulted in fertilisation. It has been suggested that sporadic, long-distance pollination events by birds or bats may correspond with outcrossing breeding strategies typically described for eucalypts (Bacles et al, 2007;Potts and Wiltshire, 1997;McDonald, 2004;Southerton et al, 2004). In this regard, various eucalypt species are known to produce large volumes of nectar during the night, possibly to attract nocturnal pollinators such as bats (McCoy, 1990).…”

Section: Vectors Of Pollen Flow In Corymbiamentioning

confidence: 98%

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The risk of pollen-mediated gene flow from exotic Corymbia plantations into native Corymbia populations in Australia

Barbour

Crawford

Henson³

et al. 2008

Forest Ecology and Management

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Section: Vectors Of Pollen Flow In Corymbiamentioning

confidence: 98%

“…Corymbia flowers attract a wide range of generalist pollinators, from small (<1 cm) native bees, flies and beetles to bats, honey eaters, lorikeets and parrots (Bacles et al, 2007;House, 1997;Southerton et al, 2004, Fig . 7).…”

Section: Vectors Of Pollen Flow In Corymbiamentioning

confidence: 99%

The risk of pollen-mediated gene flow from exotic Corymbia plantations into native Corymbia populations in Australia

Barbour

Crawford

Henson³

et al. 2008

Forest Ecology and Management

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“…In eucalypt species, overestimation of narrow-sense heritability from open-pollinated populations can result from the susceptibility of growth to inbreeding depression (Hardner and Potts 1995), which arise from selfing or mating between other relatives or from biparental mating under open pollination (Hodge et al 1996). CCV has a mixed mating system, with an estimated average out-crossing rate estimated close to 90% (Bacles et al 2009). Although across-sites heritability estimates for volume at age 3 were similar, the current estimate at age 7 was somewhat greater than those estimated at age 6 in Brawner et al (2012).…”

Section: Genetic Parameter Estimatesmentioning

confidence: 99%

Genetic variation in growth and wood-quality traits ofCorymbia citriodorasubsp.variegataacross three sites in south-east Queensland, Australia

Hung

Brawner

Lee

et al. 2016

Southern Forests: a Journal of Forest Science

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Ten growth or wood-quality traits were assessed in three nearby Corymbia citriodora subsp. variegata (CCV) open-pollinated family-within-provenance trials (18 provenances represented by a total of 374 families) to provide information for the development of a breeding program targeting both pulp and solid-wood products. Growth traits (diameter at breast high over bark [DBH], height and conical volume) were assessed at 3 and 7 years of age. Wood-quality traits (density [DEN], Kraft pulp yield [KPY], modulus of elasticity [MoE] and microfibril angle [MfA]) were predicted using near-infrared spectroscopy on wood samples collected from these trials when aged between 10 and 12 years. The high average KPY, DEN and MoE, and low average MfA observed indicates CCV is very suitable for both pulp and timber products. All traits were under moderate to strong genetic control. In acrosstrials analyses, high (>0.4) heritability estimates were observed for height, DEN, MoE and MfA, while moderate heritability estimates (0.24 to 0.34) were observed for DBH, volume and KPY. Most traits showed very low levels of genotype × site interaction. Estimated age-age genetic correlations for growth traits were strong at both the family (0.97) and provenance (0.99) levels. Relationships among traits (additive genetic correlation estimates) were favourable, with strong and positive estimates between growth traits (0.84 to 0.98), moderate and positive values between growth and wood-quality traits (0.32 to 0.68), moderate and positive between KPY and MoE (0.64), and high and positive between DEN and MoE (0. 82). However, negative (but favourable) correlations were detected betweenMfA and all other evaluated traits (−0.31 to −0.96). The genetic correlation between the same trait expressed on two different sites, at family level, ranged from 0.24 to 0.42 for growth traits, and from 0.29 to 0.53 for wood traits. Therefore simultaneous genetic improvement of growth and wood property traits in CCV for the target environment in south-east Queensland should be possible, given the moderate to high estimates of heritability and favourable correlations amongst all traits studied, unless genotype × site interactions are greater than was evident.

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“…In an assessment of the likelihood and impact of gene flow and hybridisation between planted and native CCV to other spotted gums in northern NSW, Barbour et al (2008) concluded that overall the likelihood of gene flow was high because taxa are highly inter-fertile and likely share common pollinators, including those able to travel long distances (Southerton et al 2004;Bacles et al 2009). The ecological and evolutionary impact of gene flow was more difficult to assess but the impacts are likely to be less profound in such widespread and abundant species, and none are considered threatened or rare.…”

Section: Introductionmentioning

confidence: 99%

Genetic control of flowering in spotted gum, Corymbia citriodora subsp. variegata and C. maculata

et al. 2014

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Abstract. Genetically controlled asynchrony in anthesis is an effective barrier to gene flow between planted and native forests. We investigated the degree of genetically controlled variation in the timing of key floral developmental stages in a major plantation species in subtropical Australia, Corymbia citriodora subsp. variegata K.D. Hill and L.A.S Johnson, and its relative C. maculata K.D. Hill and L.A.S. Johnson. Flowering observations were made in a common garden planting at Bonalbo in northern New South Wales in spring on 1855 trees from eight regions over three consecutive years, and monthly on a subset of 208 trees for 12 months. Peak anthesis time was stable over years and observations from translocated trees tended to be congruent with the observations in native stands, suggesting strong genetic control of anthesis time. A cluster of early flowering provenances was identified from the north-east of the Great Dividing Range. The recognition of a distinct flowering race from this region accorded well with earlier evidence of adaptive differentiation of populations from this region and geographically-structured genetic groupings in C. citriodora subsp. variegata. The early flowering northern race was more fecund, probably associated with its disease tolerance and greater vigour. Bud abundance fluctuated extensively at the regional level across 3 years suggesting bud abundance was more environmentally labile than timing of anthesis. Overall the level of flowering in the planted stand (age 12 years) was low (8-12% of assessed trees with open flowers), and was far lower than in nearby native stands. Low levels of flowering and asynchrony in peak anthesis between flowering races of C. citriodora subsp. variegata may partially mitigate a high likelihood of gene flow where the northern race is planted in the south of the species range neighbouring native stands.

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Reproductive biology ofCorymbia citriodorasubsp.variegataand effective pollination across its native range in Queensland, Australia

Cited by 17 publications

References 0 publications

The risk of pollen-mediated gene flow from exotic Corymbia plantations into native Corymbia populations in Australia

The risk of pollen-mediated gene flow from exotic Corymbia plantations into native Corymbia populations in Australia

Genetic variation in growth and wood-quality traits ofCorymbia citriodorasubsp.variegataacross three sites in south-east Queensland, Australia

Genetic control of flowering in spotted gum, Corymbia citriodora subsp. variegata and C. maculata

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