Scleroderris Canker of Todo-Fir in Hokkaido, Northern Japan.

Yokota, Shun-ichi; Uozumi, T.; Matsuzaki, Shinya

doi:10.1111/j.1439-0329.1975.tb00493.x

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…Gremmeniella abietina (Lagerberg) Morelet (anamorph Brunchorstia pinea (P. Karsten) Höhnel) is a pathogenic fungus which has caused destruction in plantations and natural conifer forests in Northern and Central Europe, North America, and Japan (Yokota, 1975;Dorworth, 1979;Kaitera and Jalkanen, 1992) producing symptoms such as stem cankers and shoot dieback (Donaubauer, 1972). This fungus has been divided into three races: European, North American and Asian.…”

Section: Introductionmentioning

confidence: 99%

Effect of putative mitoviruses on in vitro growth of Gremmeniella abietina isolates under different laboratory conditions

2012

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Mitoviruses have been found in several forest pathogens (i.e. Cryphonectria parasitica, Gremmeniella abietina), and because they have been shown to reduce the virulence of host fungi there is a growing interest in studying their use as a biocontrol. This study was carried out to test the effect of temperature (5°C, 15°C, 25°C and 35°C), pH (4, 5, 7 and 9) and osmotic potential (-0.6, -1.2, -1.8 and -2.4 MPa) on the mycelial growth of seven G. abietina isolates under controlled laboratory conditions. Four of the isolates hosted mitoviruses and three of them did not. During the experiment, mycelial growth was recorded every week for a period of 8 weeks. Results showed no differences in growth behavior between mitovirus infected and non-infected isolates when placed under different pH modifications. However, the mitovirus-infected isolates presented larger mycelial growth than the mitovirus-free ones when at the fungi's optimal growing temperature of 15°C. When growing at certain osmotic potentials (-0.6 and -1.8 MPa) a reduction in growth of the mitovirus-infected isolates was observed. The results of this experiment suggest that mycelial growth among non-infected isolates and isolates naturally infected by mitovirus vary under different culture conditions, thus providing further insight into the effects of mitovirus on Gremmeniella abietina isolates.Key words: mitoviruses; Scleroderris canker; in vitro; biological control; Gremmeniella abietina; dsRNA. Resumen Efecto de posibles mitovirus en el crecimiento in vitro de aislados de Gremmeniella abietina bajo diferentes condiciones de laboratorioLos mitovirus son virus exclusivamente fúngicos que han sido aislados de algunos patógenos forestales (i.e. Cryphonectria parasitica, Gremmeniella abietina) y ya que pueden reducir la virulencia del hongo existe un creciente interés por su posible papel como agentes de control biológico. Se ha llevado a cabo un estudio para evaluar el efecto de la temperatura (5°C, 15°C, 25°C y 35°C), el pH (4, 5, 7 y 9) y el potencial osmótico (-0.6, -1.2, -1.8, -2.4 MPa) en el crecimiento micelial de siete aislados de G. abietina bajo condiciones controladas de laboratorio. Cuatro de los aislados albergaban mitovirus y tres de ellos no. Durante el experimento, el crecimiento micelial fue registrado semanalmente hasta completar 8 mediciones. Los aislados infectados con mitovirus presentaron mayor crecimiento micelial que los no infectados a la temperatura de crecimiento óptimo del hongo de 15°C. No se observaron efectos de la presencia de mitovirus entre los aislados infectados y los no infectados en los tratamientos de modificación del pH. Cuando se modificaron los potenciales osmóticos se observó una reducción del crecimiento micelial de los aislados infectados con mitovirus en los potenciales osmóticos de -0.6 y -1.8 MPa. Los resultados de este experimento sugieren que la presencia de los mitovirus afecta al crecimiento micelial del hongo bajo distintas condiciones de laboratorio. Este estudio proporciona un conocimiento más prof...

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Section: Introductionmentioning

confidence: 99%

Effect of putative mitoviruses on in vitro growth of Gremmeniella abietina isolates under different laboratory conditions

2012

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“…Among them, L. calyciformis was highly abundant on symptomatic shoots, especially those with the symptoms G and I. Lachnellula is comprised of approximately 40 species that grow on the bark and wood of conifers (Hosoya et al, 2010) as saprotrophs but also as pathogens that cause cankers on twigs, branches and tree stems (Oguchi, 1979;Smerlis, 1973). Lachnellula calyciformis is generally regarded as a saprotroph on dead conifer twigs, although it is also known as a causative agent of canker diseases on conifers (Kamei, 1962;Oguchi, 1979;Yokota & Matsuzaki, 1971).…”

Section: Other Potential Pathogens In Pinus Mugo Subsp Mugo Shootsmentioning

confidence: 99%

Fungi associated with shoot dieback of Pinus mugo subsp. mugo in the Polish Tatra Mountains

Jankowiak,

Bartnik,

Ledwich

et al. 2024

Forest Pathology

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Dieback of dwarf pine scrub (Pinus mugo subsp. mugo) shoots can limit the growth of this species in subalpine areas of the Carpathian Mountains. In July 2023, extensive shoot decline was observed in P. mugo patches in the West Tatra Mountains in southern Poland. Symptomatic shoots showed shoot tip dieback and red‐brown needle discoloration. Internal symptoms included dark discoloration of the pith parenchyma and necrotic lesions in shoot periderms. In this study, we described the symptoms of P. mugo shoot dieback and surveyed the culturable fungi from asymptomatic and symptomatic P. mugo shoots, as well as the bases of needles growing from shoots. In addition, we conducted phylogenetic analyses to distinguish between potential cryptic species of Sydowia polyspora. The dwarf pine scrub shoots and needles were sampled from four patches in the Polish Tatra Mountains. In total, 128 distinct taxa were identified. Ascomycota was dominant, representing 96.6% of the isolates. Among the taxa identified, Sydowia polyspora crypt. sp. I, Lachnellula calyciformis, Mollisia sp. 8, Tympanis sp., Epicoccum mezzettii, E. nigrum, Infundichalara sp., Lophium mytilinum, Cytospora sp., Soosiella sp., Cladosporium westerdijkiae and Hendersonia pinicola were most frequently isolated. In most cases, tissue type and sample site significantly affected the abundance and composition of colonizing fungi. Only S. polyspora was found consistently in all sample types, suggesting that this fungus may be responsible for the shoot dieback of P. mugo. Phylogenetic analyses demonstrated that S. polyspora should be treated as a species complex containing at least four cryptic species (referred to as groups I–IV), that are highly host‐specific to different conifer species. We also found several other well‐known pathogens, namely Allantophomopsis pseudotsugae, Botrytis cinerea, Cytospora sp., Fusarium sp., Sirococcus conigenus and Tympanis sp., which may cause considerable damage to Pinus spp. shoots. Among them, only Cytospora sp., and Tympanis sp. were found often. This is the first comprehensive survey of the fungi associated with extensive shoot dieback of P. mugo in the Carpathian Mountains, and this research led to the discovery of numerous new fungal species associated with P. mugo.

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Ecology of Compression Wood Formation

Timell¹

1986

Compression Wood in Gymnosperms

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Scleroderris Canker of Todo-Fir in Hokkaido, Northern Japan.

Cited by 6 publications

References 9 publications

Effect of putative mitoviruses on in vitro growth of Gremmeniella abietina isolates under different laboratory conditions

Effect of putative mitoviruses on in vitro growth of Gremmeniella abietina isolates under different laboratory conditions

Fungi associated with shoot dieback of Pinus mugo subsp. mugo in the Polish Tatra Mountains

Ecology of Compression Wood Formation

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