Independent QTL underlie resistance to the native pathogen Quambalaria pitereka and the exotic pathogen Austropuccinia psidii in Corymbia

Butler, Jakob B.; Potts, Brad M.; Vaillancourt, René E.; Lee, Dong Hoon; Pegg, Geoff S.; Freeman, Jules S.

doi:10.1007/s11295-019-1378-x

Cited by 11 publications

(7 citation statements)

References 118 publications

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“…robusta compared to the other species tested in this study, including positive control plants, suggests that potential resistance mechanisms mediated by multiple quantitative trait loci (QTLs) might exist in K . robusta , similar to that predicted for some other Myrtaceae species (Butler et al, 2019). However, artificial screening cannot replace field tests.…”

Section: Discussionsupporting

confidence: 89%

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Susceptibility of native New Zealand Myrtaceae to the South African strain of Austropuccinia psidii: A biosecurity threat

et al. 2020

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Austropuccinia psidii, cause of myrtle rust, has spread globally where Myrtaceae occur. Multiple strains of A. psidii have been identified, including a unique strain found only in South Africa. The South African strain is a biosecurity concern for species of Myrtaceae worldwide. This is because preliminary testing of South African Myrtaceae suggests it could have a wide host range, and thus has the potential to be invasive. In this study, we assessed the ability of the South African strain to infect other species of Myrtaceae by testing the susceptibility of New Zealand provenance Myrtaceae. Seedlings of four native New Zealand Myrtaceae species (Metrosideros excelsa, Leptospermum scoparium, Kunzea robusta, and Kunzea linearis) were artificially inoculated in South Africa with a single‐uredinium isolate of the South African strain. Fourteen days after inoculation, uredinia, and in many cases telia, had developed on the young leaves and stems of all four host species, which led to shoot tip dieback in the more severe cases. When comparisons were made between the species, K. robusta was the least susceptible to the South African strain of A. psidii, while L. scoparium and M. excelsa were the most susceptible. While only a limited number of seed families were tested, only a small proportion of the seedlings showed resistance to infection by the South African strain. This preliminary testing highlights the potential invasive risk the South African strain poses to global Myrtaceae communities, including New Zealand Myrtaceae.

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Section: Discussionsupporting

confidence: 89%

“…robusta, similar to that predicted for some other Myrtaceae species (Butler et al, 2019). However, artificial screening cannot replace field tests.…”

Section: Discussionsupporting

confidence: 76%

Susceptibility of native New Zealand Myrtaceae to the South African strain of Austropuccinia psidii: A biosecurity threat

et al. 2020

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“…Years later, many quantitative trait loci (QTL) were mapped in Eucalyptus spp. and Corymbia spp., indicating that genetic control of rust resistance is complex and may depend on many other minor-effect genes (Alves et al, 2012;Butler et al, ,2016Butler et al, , , 2019Lima et al, 2011;Rosado et al, 2010). In addition, transcriptomics analysis of a E. grandis genotype revealed a constitutive overexpression of several genes related to MR resistance (Santos, Vidigal, et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

A new, highly aggressive race of Austropuccinia psidii infects a widely planted, myrtle rust‐resistant, eucalypt genotype in Brazil

et al. 2021

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“…Since QBS is a native disease for this tree, due to the mutual evolution of the host and the pathogen, the QTLs identified for resistance to this pathogen were of larger effect and independent from the QTLs for rust resistance. Therefore, most of the QTLs involved in QBS resistance were associated with the specificity of HR, which is carried out through specific R genes (oligogenic control) [ 50 , 51 ]. Past studies have shown that many of the QTLs identified for important diseases in eucalypts including CLB, Mycosphaerella leaf spot, and Ceratocystis wilt are mainly distributed on different linkage groups (LGs), indicating that resistance to these diseases is polygenic [ 43 , 48 , 52 ].…”

Section: Experimental Approaches To Characterizing Disease Resistance...mentioning

confidence: 99%

Genome-Wide SNP Markers Accelerate Perennial Forest Tree Breeding Rate for Disease Resistance through Marker-Assisted and Genome-Wide Selection

Younessi-Hamzekhanlu

Gailing²

2022

IJMS

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The ecological and economic importance of forest trees is evident and their survival is necessary to provide the raw materials needed for wood and paper industries, to preserve the diversity of associated animal and plant species, to protect water and soil, and to regulate climate. Forest trees are threatened by anthropogenic factors and biotic and abiotic stresses. Various diseases, including those caused by fungal pathogens, are one of the main threats to forest trees that lead to their dieback. Genomics and transcriptomics studies using next-generation sequencing (NGS) methods can help reveal the architecture of resistance to various diseases and exploit natural genetic diversity to select elite genotypes with high resistance to diseases. In the last two decades, QTL mapping studies led to the identification of QTLs related to disease resistance traits and gene families and transcription factors involved in them, including NB-LRR, WRKY, bZIP and MYB. On the other hand, due to the limitation of recombination events in traditional QTL mapping in families derived from bi-parental crosses, genome-wide association studies (GWAS) that are based on linkage disequilibrium (LD) in unstructured populations overcame these limitations and were able to narrow down QTLs to single genes through genotyping of many individuals using high-throughput markers. Association and QTL mapping studies, by identifying markers closely linked to the target trait, are the prerequisite for marker-assisted selection (MAS) and reduce the breeding period in perennial forest trees. The genomic selection (GS) method uses the information on all markers across the whole genome, regardless of their significance for development of a predictive model for the performance of individuals in relation to a specific trait. GS studies also increase gain per unit of time and dramatically increase the speed of breeding programs. This review article is focused on the progress achieved in the field of dissecting forest tree disease resistance architecture through GWAS and QTL mapping studies. Finally, the merit of methods such as GS in accelerating forest tree breeding programs is also discussed.

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Independent QTL underlie resistance to the native pathogen Quambalaria pitereka and the exotic pathogen Austropuccinia psidii in Corymbia

Cited by 11 publications

References 118 publications

Susceptibility of native New Zealand Myrtaceae to the South African strain of Austropuccinia psidii: A biosecurity threat

Susceptibility of native New Zealand Myrtaceae to the South African strain of Austropuccinia psidii: A biosecurity threat

A new, highly aggressive race of Austropuccinia psidii infects a widely planted, myrtle rust‐resistant, eucalypt genotype in Brazil

Genome-Wide SNP Markers Accelerate Perennial Forest Tree Breeding Rate for Disease Resistance through Marker-Assisted and Genome-Wide Selection

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