Hendersonia acicola in an epidemic caused by Lophodermella sulcigena with special reference to biological control

Jalkanen, Risto; Laakso, Riitta

doi:10.29203/ka.1986.244

Cited by 6 publications

(7 citation statements)

References 3 publications

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“…Such discoloration accompanies the infection of needles by Leptomelanconium allescheri as well [29]. Also secondary fungi, e.g., Hendersonia acicola, contribute to such a change in color of the needles [44,68]. Different reactions between various tree species are also observed in case of other plant pathogens.…”

Section: Discussionmentioning

confidence: 99%

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Involvement of Lophodermella sulcigena in Endemic Disease of Pinus mugo Needles in the Polish Tatra Mountains

Kowalski,

Bartnik,

Bilański

2024

Forests

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Pinus mugo plays a significant ecological role in the natural environment at high altitudes in the mountains including the Alps, Pyrenees, Carpathians, and Balkans. In such severe conditions, it is subjected to the harmful effects of various abiotic and biotic factors. In one of the areas of its natural occurrence in Tatra Mts. (southern Poland), for the last few years, a significant intensification of needle disease has been observed. Symptoms similar to those recorded in Tatra Mts. also occur on other Pinus species in Europe and North America, where they are caused by fungi belonging to the genus Elytroderma, Lophodermella, Lophophacidium or Ploioderma (Rhytismataceae). The current paper presents the results of research which was mainly aimed at characterization of disease symptoms observed for the first time in Poland on P. mugo needles, and identification of the main causal agent with use of the morphological and molecular technique. Based on the analyses performed at different times of the year (2015–2020), it was found that dieback symptoms initially appeared only on first-year needles, a few weeks after their development. Symptoms occur on one or both needles in the bundle. The distal parts of the needles died, while the basal parts remained green. In the following year, mainly in June and July, on the previous year’s needles attached to the shoots, mature ascomata can be seen. The fungus Lophodermella sulcigena has been identified as the cause of these symptoms. So far, the related species L. conjuncta has not been found. The morphological features of the pathogen microstructure produced on P. mugo needles are presented. Attention was drawn to certain features that may make its identification difficult, especially in terms of shapes and sizes of ascospores. The phylogenetic position of the identified causal agent in relation to closely related other species was determined. The current results confirmed that L. sulcigena shows great phylogenetic similarity to L. montivaga, which is found in North America. Nine rDNA barcode sequences of L. sulcigena obtained in this work will enrich the NCBI GenBank database. The obtained results, indicating the presence of other fungi in L. sulcigena ascomata, which may limit the spread of its ascospores, were also discussed.

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Section: Discussionmentioning

confidence: 99%

“…Numerous fungal species associated with needles infected primary by L. sulcigena are known. On P. sylvestris, it is mainly Hendersonia acicola [44,47,68,78]. On P. nigra, heavy secondary colonization was shown by Lophodermium seditiosum and Lo.…”

Section: Discussionmentioning

confidence: 99%

Involvement of Lophodermella sulcigena in Endemic Disease of Pinus mugo Needles in the Polish Tatra Mountains

Kowalski,

Bartnik,

Bilański

2024

Forests

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“…In contrast, no investigations have been done to attribute current weather variables with recent serious disease events caused by L. exigua in plantations and natural forests in China (Fan et al, 2012;Yang et al, 2018) Funk have been reported to restrict symptom development or suppress occurrence of some Lophodermella species (Jalkanen, 1985;Jalkanen & Laakso, 1986;Millar, 1984;Ziller & Funk, 1973). Similar observations were found on Sarcotrochila macrospora Ziller & A.…”

Section: Speciesmentioning

confidence: 99%

“…Severity of needle disease caused by Rhytismataceae pathogens may be modified through secondary colonization. Saprophytic fungal species such as Hendersonia pinicola Wehm., Hendersonia acicola Münch and Tubeuf and Hemiphacidium longisporum Ziller & A. Funk have been reported to restrict symptom development or suppress occurrence of some Lophodermella species (Jalkanen, 1985; Jalkanen & Laakso, 1986; Millar, 1984; Ziller & Funk, 1973). Similar observations were found on Sarcotrochila macrospora Ziller & A. Funk with Davisomycella ampla (Davis) Darker infections (Ziller & Funk, 1973).…”

Section: Ecology and Epidemiologymentioning

confidence: 99%

Needle pathogens of Rhytismataceae: Current knowledge and research opportunities for conifer foliar diseases

Ata,

Burns,

Stewart

2024

Forest Pathology

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Needle diseases caused by pathogens within Rhytismataceae are increasing in frequency globally where pines are either a predominate species or are grown commercially, and yet remain poorly understood. Here, we provide background information on the current knowledge and management strategies of needle pathogens in the Rhytismataceae and discuss research opportunities using molecular tools to fill knowledge gaps. Many of the aggressive needle pathogens within this group lack morphological features to delimit species and are difficult to grow in axenic cultures, which complicates scientific investigations. Molecular research has greatly advanced knowledge of this unique group of pathogens. Nucleotide sequences from multiple gene loci identified greater diversity within this group of pathogens than previously thought, as new and cryptic species are being discovered in broader geographic regions. High throughput sequencing and analyses revealed that an endophytic lifestyle is a common trait among fastidious if not obligate needle pathogens within Rhytismataceae. Further, molecular analyses showed the impact these pathogens have on the diversity of endophytic microbiota is underestimated. Early detection in healthy‐looking needles using PCR‐based markers greatly improves capabilities for disease diagnosis and monitoring. Despite growing number of molecular studies on Rhytismataceae needle pathogens, fundamental questions on the taxonomy, phylogeny, ecology and pathology of many Rhytismataceae needle pathogens remain unanswered. Nonetheless, with the projected changes in the occurrence and severity of Rhytismataceae pathogens, increased accessibility to molecular tools vastly expands the potential to gain more insights into understudied needle pathosystems to help define and address its impact under changing environments and consequently inform forest disease management more effectively.

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“…50 micrograms per m 3 , but when the wind is southwesterly, the content is negligible (Anonymous 1990). Some recent severe forest epidemics (Jalkanen & Laakso 1986, Parviainen 1990) in northeastern Finland have been attributed at least partly to stress caused by toxic flue gas.…”

Section: The Study Areamentioning

confidence: 99%

Basidiomycetes at the timberline in Lapland 1. Introduction

Renvall¹,

Renvall²,

Niemelä³

1991

Karstenia

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Basidiomycetes, especially the wood-inhabiting fungi, were studied in the Vlirrio Strict Nature Reserve, the Urho Kekkonen National Park and adjacent areas in Finnish East Lapland, which contain some of the last remnants or primeval, Northern Boreal forest at and near the alpine and polar timberline. The qualitative and quantitative composition of the fungi, as indicated by their fruit body production, was studied in naturally regenerating virgin forests and the area of a fairly recent forest fire, special attention being paid both to species recognized as threatened in Finland and to potentially threatened fungi. The area is also affected by long-distance air pollution from the mining and metal industry in the western Munnansk Region, Russia. The main woody plants decayed by basidiomycetes in the region are Pinus sylvestris L., Picea abies (L.) Karsten subsp. obovata (Ledeb.) Domin and Betula pubescens Ehrh. subsp. czerepanovii (Orlova) Hlimet-Ahti. A general biogeographical and ecological outline of the study area is presented.

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Hendersonia acicola in an epidemic caused by Lophodermella sulcigena with special reference to biological control

Cited by 6 publications

References 3 publications

Involvement of Lophodermella sulcigena in Endemic Disease of Pinus mugo Needles in the Polish Tatra Mountains

Involvement of Lophodermella sulcigena in Endemic Disease of Pinus mugo Needles in the Polish Tatra Mountains

Needle pathogens of Rhytismataceae: Current knowledge and research opportunities for conifer foliar diseases

Basidiomycetes at the timberline in Lapland 1. Introduction

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