Two Types of the European Race of Gremmeniella abietina Can Be Identified with Immunoblotting

Petäistö, Raija-Liisa; Uotila, Antti; Hellgren, Magnus; Kaitera, Juha; Tuomainen, Jaana; Kajander, E. Olavi

doi:10.2307/3761157

Cited by 14 publications

(8 citation statements)

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“…Two of these types have been recorded in Fennoscandia: type A and B (Uotila 1983(Uotila , 1992, or large tree type (LTT) and small tree type (STT; Hellgren and Hö gberg 1995). Based on immunoblotting, types A and B are confirmed to be identical to LTT and STT respectively (Petä istö et al 1996). Initial investigations of genetic variation in G. abietina in northern Sweden recorded only the northern amplitype, similar to type B or STT (Hamelin et al 1996;Hansson et al 1996).…”

Section: Introductionmentioning

confidence: 94%

Survival and vitality of Gremmeniella abietina on Pinus sylvestris slash in northern Sweden

Witzell¹,

Bernhold

Hansson

2006

Forest Pathology

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Survival and vitality of Gremmeniella abietina on Pinus sylvestris slash was studied in northern Sweden during 2003 and 2004. Once a month between September 2003 and April 2004, two to three trees were cut down and debranched. Shoots with pycnidia were sampled at the felling date and then at every consecutive month. The percentage of germinated conidia from each shoot was calculated after 24, 48 and 72 h incubation. The vitality of G. abietina pycnidia in the slash remained high the whole period. Intact pycnidia were found on slash several months after the time of conidial sporulation, which indicates that new pycnidia may be produced on dead pine branches. Sampling of shoots from slash on 13-to 18-month-old clear-cuts showed conidial germination capacity as high as in pycnidia collected in fresh slash. Due to survival of G. abietina in slash it is recommended to postpone planting of P. sylvestris seedlings in northern boreal areas to the third vegetation period after sanitary clear-cuts.

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Section: Introductionmentioning

confidence: 94%

Survival and vitality of Gremmeniella abietina on Pinus sylvestris slash in northern Sweden

Witzell¹,

Bernhold

Hansson

2006

Forest Pathology

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“…Seedlings in treatment group 2 were similarly inoculated in August-September (August 24, 30 and September 6, 1993). Gremmeniella isolates used consisted of Kai 1.2 and Sup 1.1× 1.5 (from Dr. Antti Uotila), both belonging to type B (Petäistö et al 1996). The conidia used in all experiments was obtained as described by Petäistö & Kurkela (1993).…”

Section: Raising and Inoculation Of The Seedlingsmentioning

confidence: 99%

Effects of Winter Storage Temperature and Age of Pinus sylvestris Seedlings on the Occurrence of Disease Induced by Gremmeniella abietina

Petäistö¹,

Laine²

1999

Scandinavian Journal of Forest Research

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Three winter storage temperatures, −7°C, −3°C and 0°C, were studied to determine their effects on the infection of Scots pine (Pinus syl6estris L.) seedlings by Gremmeniella abietina (Lagerb.) Morelet. Pine seedlings in the first and second growing seasons were inoculated with conidia on two different occasions during the season. After the following winter, seedlings were examined for symptoms of the disease. The seedlings overwintering at −7°C and −3°C were more diseased than those kept at 0°C. Seedling bud break was slower the lower the winter storage temperature, suggesting that growth initiating activity has a likely effect on the outbreak of disease.

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“…Three seedling trays were moved outdoors on 24 June 2002 and placed near to diseased Pinus cembra L. pines of approximately 20 years in age. An isolation of G. abietina from a diseased P. cembra in the same area was identified as A type (Petä istö et al 1996).…”

Section: Experiments 3: Natural Infection On Seedlingsmentioning

confidence: 99%

“…abietina: A (large tree type) and B (small tree type). Both types cause disease on seedlings and on the lower part of the trees; the A type also attacks the upper crowns of large trees (Uotila 1983;Hellgren and Hö gberg 1995;Petä istö et al 1996). Damage caused by G. abietina is common on pine seedlings in nurseries (Kurkela 1967;Skilling 1969;Jancarik and Urosevic 1973) and symptoms are usually typical.…”

Section: Introductionmentioning

confidence: 99%

Infection of Norway spruce container seedlings byGremmeniella abietina

Petäistö¹

2008

Forest Pathology

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First-and second-year containerized Norway spruce seedlings were inoculated with conidia of type A (large tree type) and type B (small tree type) of Gremmeniella abietina var. abietina at different times during the summer. The appearance of symptoms after artificial inoculation and natural infection on spruce seedlings were recorded the following spring and compared with the disease symptoms on Scots pine seedlings. The proportion of diseased seedlings after inoculation reached as high as 80%. The susceptible period during the summer began later on the first-year seedlings than on the second-year seedlings, and was similar for the pine seedlings. Susceptibility of first-year seedlings was highest in August and on second-year seedlings in July. The accumulated temperature sum, relative humidity and height growth for first-and second-year seedlings was assessed. Natural infection in 2002 caused more disease on pine than on spruce seedlings. Experimental thinning of seedlings had no effect on disease incidence. In a preliminary comparison between the ability of A and B types to cause disease in Norway spruce seedlings, type B caused more damage than type A after inoculation. However, type A caused a high disease frequency in other experiments in this study. Symptoms on Norway spruce seedlings often first occurred in the mid-section of the shoot, and were similar to those observed on pine seedlings: needles turned brown, starting at the needle base, in the spring following inoculation. On first-year spruce, diseased needles were shed rapidly, in contrast to a slower rate of shedding on first-year pine seedlings. Pycnidia developed about 2 years after inoculation (on pine 1 year after inoculation). On Norway spruce seedlings the lower part of the shoot, including the lateral shoots, often remained alive. The experiments show that G. abietina can cause disease on containerized Norway spruce seedlings under nursery conditions in Finland. The coincidence of spore dispersal, seedling susceptibility and predisposing factors are important in disease development.

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Two Types of the European Race of Gremmeniella abietina Can Be Identified with Immunoblotting

Cited by 14 publications

References 0 publications

Survival and vitality of Gremmeniella abietina on Pinus sylvestris slash in northern Sweden

Survival and vitality of Gremmeniella abietina on Pinus sylvestris slash in northern Sweden

Effects of Winter Storage Temperature and Age of Pinus sylvestris Seedlings on the Occurrence of Disease Induced by Gremmeniella abietina

Infection of Norway spruce container seedlings byGremmeniella abietina

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