First Report of <i>Lonsdalea populi</i> Causing Bark Canker Disease on Poplar in Portugal

Abelleira, A.; Moura, Luísa; Aguín, O.; Salinero, C.

doi:10.1094/pdis-12-18-2230-pdn

Cited by 6 publications

(7 citation statements)

References 4 publications

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“…The disease symptoms (oozing cankers with water-soaked, soft wood) caused by L. populi observed in this study are consistent with previous reports of Lonsdalea canker of poplars [8,[10][11][12]. In the current study, however, L. populi was isolated from two-year old P. × euramericana trees, whereas in other countries it was found on more than three-year-old trees [8,[10][11][12]. Symptoms of a bacterial canker disease on P. × euramericana have previously also been reported associated with Xanthomonas populi (Ridé) Ridé and Ridé.…”

Section: Discussionsupporting

confidence: 93%

“…In severe cases of the disease, cankers caused crown die-back and the diseased trees died within a few weeks (Figure 1d). These symptoms resembled those of a recently described bacterial canker disease of hybrid poplars in Hungary, Portugal, Spain, and China caused by L. populi [8,[10][11][12]. The aim of this study was to identify the bacterium associated with the disease symptoms observed on P. × euramericana cl.…”

Section: Introductionmentioning

confidence: 54%

“…The isolation of L. populi from P. × euramericana in Serbia is not surprising, given that it is a well-known pathogen that causes bacterial canker disease of hybrid poplars [12]. Lonsdalea populi has been isolated from P. × euramericana in previous studies in Hungary, Spain, Portugal, and China [8,[10][11][12]. It has also been found associated with P. × interamericana in Spain and recently reported as a pathogen of Chinese willow (Salix matsudana Koidz.)…”

Section: Discussionmentioning

confidence: 93%

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Bacterial Canker Disease on Populus × euramericana Caused by Lonsdalea populi in Serbia

Zlatković

Tenorio-Baigorria

Lakatos

et al. 2020

Forests

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Populus × euramericana (Dode) Guinier clone (cl.) “I-214” is a fast-growing interspecific hybrid between Eastern cottonwood (P. deltoides Bartr. ex Marsh) and European black poplar (Populus nigra L.). Populus × euramericana was introduced into Serbia in the 1950s and has become one of the most widely grown poplar species. In September 2019, cankers were observed on stems and branches of P. × euramericana cl. “I-214” trees in a two-year-old poplar plantation in the province of Vojvodina, Serbia. The canker tissue was soft and watery, and a colorless fluid that smelled rotten flowed from the cracks in the bark, suggesting possible bacterial disease. After two weeks, diseased trees experienced crown die-back and oozing of foamy, odorous exudates and this study aimed to identify the causal agent of the disease. Canker margins and exudates were collected from 20 symptomatic trees. The associated bacterium was isolated and identified using biochemical characteristics, phylogenetic analyses based on 16S rRNA gene sequences, and multilocus sequence analyses (MLSA) based on partial sequencing of three housekeeping genes (gyrB, infB, and atpD). The pathogen was identified as Lonsdalea populi. Pathogenicity tests were conducted on rooted cuttings of P. × euramericana cl. “I-214” in an environmental test chamber and demonstrated that the isolated bacterial strain was able to reproduce symptoms of softened, water-soaked cankers and exudation. To the best of our knowledge, this is the first report of L. populi causing bacterial canker disease on P. × euramericana cl. “I-214” in Serbia and in southeastern Europe (SEE). It is also the first report of a bacterial disease on hybrid poplars, including P. × euramericana in this country and in SEE. If the disease spreads into new areas, selection for L. populi resistance may need to be integrated into future poplar breeding programs.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 93%

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Bacterial Canker Disease on Populus × euramericana Caused by Lonsdalea populi in Serbia

Zlatković

Tenorio-Baigorria

Lakatos

et al. 2020

Forests

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“…× euramericana , inoculation with the bacterial inocula in the lab leads to bark canker of a wide range of poplar cultivars, including Populus tomentosa . In 2017, Lonsdalea poplar canker was recorded in Portugal (Abelleira et al, 2019). Moreover, Populus × interamericana “Beaupre” and P. × euramericana “I-214” and “MC” were infected by L. populi in nine plantations in Spain (Berruete et al, 2016).…”

Section: Symptoms Of Lonsdalea Canker and Host Rangementioning

confidence: 99%

Molecular Aspects of an Emerging Poplar Canker Caused by Lonsdalea populi

2019

Front. Microbiol.

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The Gram-negative bacterium Lonsdalea populi causes a lethal disease known as bark canker on Populus × euramericana in China and Europe. Typical symptoms of bark canker include an abundant white-colored fluid, which oozes from the infected tissues. The availability of the genomic sequence of the bacterium provided the necessary resource to launch genome-scale investigations into the mechanisms fundamental to pathogenesis. Functional analyses of a diverse group of genes encoding virulence factors and components of signaling pathways indicate that successful bark infection depends on specific responses by the pathogen to various stresses, including oxidative stress. Although physiology of resistance is well studied, the molecular processes underlying the defense responses and the genetic basis of resistance to L. populi and in other poplar species remain largely unknown. Control of the disease has relied on chemical measures. Due to the genetic amenability of Lonsdalea and poplar, this pathosystem will become an important model system to unravel molecular mechanisms of bacterial pathogenicity on woody plants. Increased understanding of pathogenesis and signaling in the interaction will facilitate the management of this kind of poplar canker.

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“…Poplar canker, a disease caused by necrotrophic fungal pathogens, mainly damages the branches of poplars [1]. It is found worldwide, hindering the development of national forestry and causing economic losses to varying degrees [2][3][4][5]. At present, the prevention measures of poplar canker mainly include physical felling and chemical spraying, but these methods cause environmental pollution and economic losses.…”

Section: Introductionmentioning

confidence: 99%

Effects of Laccaria bicolor on Gene Expression of Populus trichocarpa Root under Poplar Canker Stress

Dong

Wang

Tang

2021

JoF

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Poplars can be harmed by poplar canker. Inoculation with mycorrhizal fungi can improve the resistance of poplars to canker, but the molecular mechanism is still unclear. In this study, an aseptic inoculation system of L. bicolor–P. trichocarpa–B. dothidea was constructed, and transcriptome analysis was performed to investigate regulation by L. bicolor of the expression of genes in the roots of P. trichocarpa during the onset of B. dothidea infection, and a total of 3022 differentially expressed genes (DEGs) were identified. Weighted correlation network analysis (WGCNA) was performed on these DEGs, and 661 genes’ expressions were considered to be affected by inoculation with L. bicolor and B. dothidea. Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses showed that these 661 DEGs were involved in multiple pathways such as signal transduction, reactive oxygen metabolism, and plant-pathogen interaction. Inoculation with L. bicolor changed the gene expression pattern of the roots, evidencing its involvement in the disease resistance response of P. trichocarpa. This research reveals the mechanism of L. bicolor in inducing resistance to canker of P. trichocarpa at the molecular level and provides a theoretical basis for the practical application of mycorrhizal fungi to improve plant disease resistance.

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First Report of Lonsdalea populi Causing Bark Canker Disease on Poplar in Portugal

Cited by 6 publications

References 4 publications

Bacterial Canker Disease on Populus × euramericana Caused by Lonsdalea populi in Serbia

Bacterial Canker Disease on Populus × euramericana Caused by Lonsdalea populi in Serbia

Molecular Aspects of an Emerging Poplar Canker Caused by Lonsdalea populi

Effects of Laccaria bicolor on Gene Expression of Populus trichocarpa Root under Poplar Canker Stress

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