Infection and disease development of Quambalaria spp. on Corymbia and Eucalyptus species

Pegg, Geoff S.; Webb, Richard I.; Carnegie, Angus J.; Wingfield, M.J.; Drenth, A.

doi:10.1111/j.1365-3059.2009.02087.x

Cited by 25 publications

(29 citation statements)

References 26 publications

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“…The late onset of the wet season, rather than a change in host susceptibility, may be the reason disease was not observed in the third year of our trials. Rainfall levels during the normally wet months of November and December, the time of assessment, were low (Bureau of Meteorology 2010) and not conducive to disease development (Pegg et al 2009). The presence of ramicorns in different positions up the stems of the more susceptible clones is perhaps a useful indicator of the number of Q. pitereka infection events.…”

Section: Discussionmentioning

confidence: 99%

Potential gains through selecting for resistance in spotted gum to Quambalaria pitereka

Pegg

Shuey²,

Carnegie³

et al. 2011

Australasian Plant Pathol.

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Quambalaria shoot blight, caused by the fungus Quambalaria pitereka, is a serious disease affecting the expanding eucalypt plantation estate in subtropical and tropical eastern Australia. Trees that are severely infected are often multi-stemmed and stunted and infection of young trees may give rise to poor form in mature trees. A spotted gum clonal trial provided the opportunity to investigate the impact of the disease on tree growth and factors influencing tree architecture (tree form), which affects wood quality. We measured the effect that Q. pitereka infection during plantation establishment (up to 6 months old) has on growth and tree architecture and productivity to age 3 years. Our results show that the pathogen has a significant impact on trees at plantation establishment, which results in a negative impact on wood quality, potentially reducing merchantable value at final harvest. Tree growth and form was significantly improved where germplasm with low susceptibility to Q. pitereka infection was used.

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Section: Discussionmentioning

confidence: 99%

Potential gains through selecting for resistance in spotted gum to Quambalaria pitereka

Pegg

Shuey²,

Carnegie³

et al. 2011

Australasian Plant Pathol.

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“…A suspension containing an equal concentration of spores from all four isolates was used for artificial inoculation following the general procedure outlined in Pegg et al . (). Seedlings were assessed 20 d after inoculation using a 1–5 scale similar to that used for A. psidii .…”

Section: Methodsmentioning

confidence: 97%

Comparison of host susceptibilities to native and exotic pathogens provides evidence for pathogen‐imposed selection in forest trees

et al. 2018

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Summary The extent to which spatial structuring of host resistance in wild plant populations reflects direct pathogen‐imposed selection is a subject of debate. To examine this issue, genetic susceptibilities to an exotic and a coevolved native fungal pathogen were compared using two Australian host tree species. Damage to common host germplasm of Corymbia citriodora ssp. variegata (CCV) and Eucalyptus globulus, caused by recently introduced (Austropuccinia psidii) and native (Quambalaria pitereka and Teratosphaeria sp.) pathogens was evaluated in common‐garden experiments. There was significant additive genetic variation within host species for susceptibility to both the exotic and native pathogens. However, susceptibility to A. psidii was not genetically correlated with susceptibility to either native pathogen, providing support for pathogen‐specific rather than general mechanisms of resistance. Population differentiation (QST) for susceptibility to the native pathogens was greater than neutral expectations (molecular FST), arguing for divergent selection. Coupled with lower native, but not exotic, pathogen susceptibility in host populations from areas climatically more prone to fungal proliferation, these findings suggest that pathogen‐imposed selection has contributed directly to a geographic mosaic of host resistance to native pathogens.

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“…Infection of CCV by Q. pitereka leads to losses in leaf area and negatively affects stem form; both of these effects negatively impact height growth many years after the initial infection (Lee et al 2009;Pegg et al 2009b). The relationship between growth and QSB damage assessments, as well as between the two QSB damage assessments, was evaluated at the population r Prov a and family r Family a level using a single bivariate model.…”

Section: Between-trait Genetic and Provenance Correlationsmentioning

confidence: 99%

“…This disease has led to significant damage in young (less than 5 years old) spotted gum field trials and plantations in QLD and in northern New South Wales (Lawson et al 2008;Carnegie 2007b;Dickinson et al 2004;Self et al 2002;Stone et al 1998). Infection of CCV by Q. pitereka leads to losses in leaf area and negatively affects stem form, which in turn negatively impact growth and timber quality many years after infection (Pegg et al , 2009bJohnson et al 2009). Moreover, while QSB is endemic to native forests on the east coast of Australia, the disease also has the potential to create serious problems in plantations around the world.…”

Section: Introductionmentioning

confidence: 99%

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

Brawner

Lee

Hardner

et al. 2011

Tree Genetics & Genomes

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The fungal pathogen Quambalaria pitereka can cause significant damage to spotted gum (Corymbia sp.) plantations in Australia. A series of seven progeny trials, involving seed from a range-wide collection from 527 individuals within 25 native populations of Corymbia citriodora sub-species variegata, were assessed for height growth and damage from Quambalaria around 1 year after planting. Infection at this young age has been found to detrimentally impact growth, form, and wood quality for many years. Genetic variance was found to be significant at both the provenance and family level. However, selection of families within provenances should lead to greater levels of genetic gain than what can be realized from selecting among provenances as estimates of additive genetic variance were consistently greater than estimates of variance among populations. Strong relationships between height and Quambalaria shoot blight (QSB) damage assessments in these trials were evidenced by very high genetic correlations between the traits; therefore, selection for any of these traits could be used to identify more productive and QSB-tolerant populations. While both provenances and families were found to interact with the trial environments at a similar level across traits, genetic correlations indicated that rankings for growth were be less stable than rankings for QSB tolerance across environments. Genetic parameter estimates derived from general and generalized linear models were very similar and either analytical method could be used to evaluate fungal damage.

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Infection and disease development of Quambalaria spp. on Corymbia and Eucalyptus species

Cited by 25 publications

References 26 publications

Potential gains through selecting for resistance in spotted gum to Quambalaria pitereka

Potential gains through selecting for resistance in spotted gum to Quambalaria pitereka

Comparison of host susceptibilities to native and exotic pathogens provides evidence for pathogen‐imposed selection in forest trees

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

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