Microspatial genetic diversity of <i>Dothistroma septosporum</i>

Kraj, Wojciech; Kowalski, T.

doi:10.1111/j.1439-0329.2012.00791.x

Cited by 6 publications

(30 citation statements)

References 47 publications

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“…Until now, this had been the only reported site with confirmed presence of D. septosporum in Poland with the only host species being black pine (Kowalski and Jankowiak 1998;Kowalski and Dro_ zy nska 2011;Kraj and Kowalski 2013). Until now, this had been the only reported site with confirmed presence of D. septosporum in Poland with the only host species being black pine (Kowalski and Jankowiak 1998;Kowalski and Dro_ zy nska 2011;Kraj and Kowalski 2013).…”

Section: Discussionmentioning

confidence: 96%

“…These were previously used in other studies (Groenewald et al 2007;Kraj and Kowalski 2013;Barnes et al 2014) but originate from a single location only, namely the stand for which D. septosporum was firstly reported in Poland -Domiarki, Goszcza forest division, Miech ow forest district (Table 1; Fig. These were previously used in other studies (Groenewald et al 2007;Kraj and Kowalski 2013;Barnes et al 2014) but originate from a single location only, namely the stand for which D. septosporum was firstly reported in Poland -Domiarki, Goszcza forest division, Miech ow forest district (Table 1; Fig.…”

Section: Sample and Isolate Collectionmentioning

confidence: 99%

“…Moist-chamber-incubated Large, black-outlined marks correspond to the locations for which isolates were obtained. 2 Isolates previously used in Kraj and Kowalski (2013). Some very close locations have been merged into one mark.…”

Section: Single Spore Isolation Of Pure Culturesmentioning

confidence: 99%

“…Further analyses of genetic differentiation within these populations indicate some of them are of a clonal origin (Hirst et al 1999;Barnes et al 2014). The opposite situation is observed in the Northern Hemisphere, where both mating types are present, together with relatively high genetic variation (Groenewald et al 2007;Drenkhan et al 2013;Kraj and Kowalski 2013;Barnes et al 2014). Knowledge of the clonal population structure of the pathogen in New Zealand (Hirst et al 1999) has been used to help develop disease-resistant P. radiata D. Don (Carson and Carson 1993).…”

Section: Introductionmentioning

confidence: 99%

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The distribution ofDothistroma septosporumand its mating types in Poland

2016

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Dothistroma needle blight (DNB), one of the most dangerous foliar diseases of pines, is the cause of much economic loss in pine plantations worldwide. The threat to pine-dominated Polish forestry from this disease is therefore very large. However, the impact of DNB has not been high mainly due to the planting of P. sylvestris, a less susceptible native species. Until now, DNB was recorded in Poland only on highly susceptible exotic P. nigra. The current situation concerning the disease in Poland is described in this article. This disease, caused by Dothistroma septosporum, was first recorded in a single location (Domiarki) in southern Poland in 1990. This study reports the occurrence of D. septosporum in 37 new locations, demonstrating that the disease has now spread across the whole country. Pinus nigra remains the predominant host species in Poland. However, three new hosts for this fungus are reported, that is P. sylvestris, P. mugo and P. ponderosa. The ratio of D. septosporum mating types varies significantly between sites, ranging from an equal proportion of each mating type to single mating type populations. For the oldest known Polish population of D. septosporum, the mating type ratio has shifted towards equilibrium over time.

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Section: Discussionmentioning

confidence: 96%

Section: Sample and Isolate Collectionmentioning

confidence: 99%

Section: Single Spore Isolation Of Pure Culturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The distribution ofDothistroma septosporumand its mating types in Poland

2016

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“…Naturally, D. septosporum spreads predominantly by rain‐splashed conidia, an effective method over short distances of a number of metres. Indeed, significant genetic differences (Mantel test), resulting from predominance of short distance dispersal mode, can be recorded over a distance of a few dozen metres (Kraj & Kowalski, ). For larger distances, human‐mediated movement of the pathogen via infected seedlings is a much more effective and well‐known phenomenon (Bednářová et al ., ; Bulman et al ., ; Drenkhan et al ., ; Mullett et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Temporal changes in the population structure ofDothistroma septosporumat the site of the first recorded outbreak in Poland

et al. 2018

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In this study, evolution of the genetic structure of the oldest known population of Dothistroma septosporum in Poland was analysed. Dothistroma needle blight was first recorded in Poland in 1990 in a 5‐year‐old plantation, meaning the population is relatively young in terms of evolution and genetic development. The preservation of DNA extracts from other studies allowed examination of the genetic variation of the pathogen over the span of a decade with the use of highly sensitive microsatellite markers. A number of evolutionary factors were identified that have shaped the genetic structure of this population over time. First, indications of the founder effect and the impact of selection were observed. Secondly, structure analysis provided evidence of the introduction of a new genetic component to the population structure after the pathogen had established. Finally, the impact of the reproductive mode on various components of the Domiarki population was examined, revealing the presence of genetic groups and structure clusters with varying levels of sexual recombination. These results demonstrate how well established and genetically robust a new population of a pathogen may become in just a few decades, given favourable conditions, and how new introductions may facilitate this process.

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Population structure and diversity of an invasive pine needle pathogen reflects anthropogenic activity

Barnes

Carbone

Kirisits

et al. 2014

Ecology and Evolution

113

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Dothistroma septosporum is a haploid fungal pathogen that causes a serious needle blight disease of pines, particularly as an invasive alien species on Pinus radiata in the Southern Hemisphere. During the course of the last two decades, the pathogen has also incited unexpected epidemics on native and non-native pine hosts in the Northern Hemisphere. Although the biology and ecology of the pathogen has been well documented, there is a distinct lack of knowledge regarding its movement or genetic diversity in many of the countries where it is found. In this study we determined the global population diversity and structure of 458 isolates of D. septosporum from 14 countries on six continents using microsatellite markers. Populations of the pathogen in the Northern Hemisphere, where pines are native, displayed high genetic diversities and included both mating types. Most of the populations from Europe showed evidence for random mating, little population differentiation and gene flow between countries. Populations in North America (USA) and Asia (Bhutan) were genetically distinct but migration between these continents and Europe was evident. In the Southern Hemisphere, the population structure and diversity of D. septosporum reflected the anthropogenic history of the introduction and establishment of plantation forestry, particularly with Pinus radiata. Three introductory lineages in the Southern Hemisphere were observed. Countries in Africa, that have had the longest history of pine introductions, displayed the greatest diversity in the pathogen population, indicating multiple introductions. More recent introductions have occurred separately in South America and Australasia where the pathogen population is currently reproducing clonally due to the presence of only one mating type.

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Microspatial genetic diversity of Dothistroma septosporum

Cited by 6 publications

References 47 publications

The distribution ofDothistroma septosporumand its mating types in Poland

The distribution ofDothistroma septosporumand its mating types in Poland

Temporal changes in the population structure ofDothistroma septosporumat the site of the first recorded outbreak in Poland

Population structure and diversity of an invasive pine needle pathogen reflects anthropogenic activity

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