Relationships between early growth and Quambalaria shoot blight tolerance in Corymbia citriodora progeny trials established in Queensland, Australia

Brawner, Jeremy; Lee, David J; Hardner, Craig; Dieters, Mark J.

doi:10.1007/s11295-011-0372-8

Cited by 39 publications

(54 citation statements)

References 31 publications

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“…Phenotypic 85 selections of large individuals with good form and a seed crop were identified 86 throughout the natural range and open pollinated seed were collected from locations 87 detailed in Figure 1. A description of the early performance and genetic connectivity 88 within these trials has been provided by Brawner et al (2011). For the purposes of 89 this study, three of the seven available CCV progeny trials ( Figure 1) were selected 90 for more detailed examination (Table 1).…”

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Selection ofCorymbia citriodorafor pulp productivity

Brawner

Meder

Dieters

et al. 2012

Southern Forests: a Journal of Forest Science

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10Evaluation of a series of spotted gum (Corymbia citirodora) progeny trials, 11 established in the subtropical region of Queensland, Australia, was undertaken to 12 provide information for the development of advanced generation breeding 13 populations suitable for pulp production. Measurements of growth at two ages were 14 combined with assessments of wood density and pulp yield from a selected sample 15 of provenances to provide comparisons between provenances, to generate genetic 16 parameter estimates and to predict genetic gain potential. While growth at this age 17 was moderate relative to other eucalypts the near infrared predictions of average 18 wood density of 756 kg/m 3 and pulp yield of 55% indicate the species has 19 considerable potential as a pulpwood crop. A pulp productivity breeding objective 20 was used to identify production populations using a range of selection trait 21 weightings to determine potential genetic gain for pulp productivity. Genetic 22 parameters indicated: 1) levels of genetic control were moderate for all traits and 23 higher for wood property traits, 2) genetic improvements could be achieved by 24 selection among and within provenances with greater levels of improvement 25 available from selection within populations, 3) genotype by environment interactions 26 were negligible, 4) genetic correlations between traits were favourable, and 5) 27 selection of volume production alone would maximise improvements in pulp 28 productivity. 29

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confidence: 99%

Selection ofCorymbia citriodorafor pulp productivity

Brawner

Meder

Dieters

et al. 2012

Southern Forests: a Journal of Forest Science

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“…It has been shown that populations from the higher-rainfall region around Gympie (Qld), including the provenances assessed in the present study belonging to CQld, have a higher tolerance to QSB than do the NSW provenances, and this leads to higher early plantation productivity of trees from the CQld region (Brawner et al 2011). Shoot blight damage caused by QSB has a major effect on the crowns of planted CCV because the lesions and distortion of new shoots, including stems and expanding leaves, can cause a massive reduction in foliage, or loss of apical dominance in severe cases (Pegg et al 2011).…”

Section: Two Flowering Groups Align With Geographic and Genetic Groupmentioning

confidence: 76%

“…The northern flowering race may be more fecund because of greater vigour owing to disease resistance A trend of higher fecundity and greater vigour of trees from the northern flowering race than the southern race may be due to its higher tolerance to QSB (Brawner et al 2011;Pegg et al 2011). It has been shown that populations from the higher-rainfall region around Gympie (Qld), including the provenances assessed in the present study belonging to CQld, have a higher tolerance to QSB than do the NSW provenances, and this leads to higher early plantation productivity of trees from the CQld region (Brawner et al 2011).…”

Section: Two Flowering Groups Align With Geographic and Genetic Groupmentioning

confidence: 99%

“…bloodwoods) to gene flow from locally exotic taxa that are inter-fertile (Barbour et al 2008). In recent years, commercial plantations of CCV have been derived from one or a few select provenances in the north of its range, particularly Woondum provenance near Gympie, Qld, which is genetically and adaptively differentiated both from the CCV and CH provenances from NSW including its higher tolerance to Quambalaria shoot blight (QSB) (Johnson et al 2009;Brawner et al 2011).…”

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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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“…O efeito da mudança do clima para a seleção de genótipos comerciais não será apenas na tolerân-cia aos estresses abióticos mais prolongados, mas também aos estresses bióticos, pois doenças e pragas estão relacionadas com as condições climáticas e são fatores que causam mortalidade e perda de produtividade dos plantios florestais (CAMPOE et al, 2016;SILVA et al, 2013;BRAWNER et al, 2011).…”

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