Results 221 to 230 of about 30,791 (266)

Spruce Embryogenesis

2008
Somatic embryogenesis, the process in which embryos, similar in morphology to their zygotic counterparts, are induced to develop in culture from somatic cells, is a suitable model system for investigating the regulation of embryo development. Through this process, a large number of embryos at defined stages of development can easily be obtained ...
Sara, von Arnold, David, Clapham
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Afforestation of Lutz Spruce, Sitka Spruce, and Norway Spruce in the Vesteraalen Islands, Norway

1993
Tree species from Alaska and Canada have been used for afforestation in northern Norway since the late 1920s. Afforestation projects were small in the beginning because the performance of foreign species far north of their natural range was unknown.
Nils O. Kaasen, Gisle Skaret, Tore Kaasen   +2 more
openaire   +1 more source

Norway spruce and spruce shoot aphid as indicators of traffic pollution

Environmental Pollution, 2000
Two-year-old Norway spruce (Picea abies (L.) Karst) seedlings were exposed to traffic emissions along roadsides with three different traffic densities and speed limits; highway, street and a quiet local road. The responses of the exposed seedlings as a host plant and those of spruce shoot aphid (Cinara pilicornis Hartig) were studied.
Viskari, E.-L., Kössi, S., Holopainen, Jarmo   +2 more
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Inheritance of plastids in interspecific hybrids of blue spruce and white spruce

Theoretical and Applied Genetics, 1989
Chloroplast DNA (cpDNA) was purified from blue spruce (Picea pungens Engelm.) and white spruce [P. glauca (Moench) Voss], and was digested with several different restriction endonucleases. Restriction fragment length polymorphisms (RFLPs) were identified that differentiated the cpDNA of both species.
M, Stine, B B, Sears, D E, Keathley
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Spruce Budworm Control in a White Spruce Plantation, 1977

Insecticide and Acaricide Tests, 1978
Abstract The test was designed to compare two experimental numbered compounds and a new formulation of Sevin to a standard formulation, Sevimol. Treatments were assigned randomly to three 30 x 30 ft plots marked out in the plantation. Treated plots were separated by 25 ft buffers.
J. B. Dimond, T. A. Morrison
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Scopelophila ligulata (Spruce) Spruce.

2012
Nell'ambito della redazione di schede di assesment per la realizzazione di una lista rossa della flora vascolare e crittogamica italiana, viene presentata la scheda relativa a Scopelophila ligulata (Spruce) Spruce.
ALEFFI, Michele, TACCHI, Roberta
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Natural hybridization between black spruce and red spruce

Molecular Ecology, 1997
Using species‐specific random amplified polymorphic DNA (RAPD) markers and morphological characters, natural hybridization between the closely related black spruce Picea mariana (Mill.) B.S.P. and red spruce P. rubens Sarg. was evaluated in natural populations from north‐eastern North America.
M. Perron, J. Bousquet
openaire   +1 more source

Effectiveness of spruce budworm spraying in New Brunswick in protecting the spruce component of spruce–fir stands

Canadian Journal of Forest Research, 1984
Tree mortality and defoliation were examined in 45 spruce (Picea sp.) stands protected against damage by spruce budworm (Choristoneurafumiferana (Clem.)) and in 27 unprotected spruce stands in New Brunswick, and were related to tree, stand, and site characteristics.
David A. MacLean, A. Wayne Kline, Daniel R. Lavigne   +2 more
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The phenology of white spruce and the spruce budworm in northern Alberta

Canadian Journal of Forest Research, 1992
Studies on the development of spruce budworm (Choristoneurafumiferana (Clem.)) on white spruce (Piceaglauca (Moench) Voss) were conducted in northern Alberta in 1969 and again in 1990. The phenology of this insect and its host were described using stochastic models.
W.J.A. Volney, H.F. Cerezke
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The Hybrid White Spruce X Himalayan Spruce

1982
Picea glauca and P. amithiana were successfully crossed. Crossability ranged from 2 to 30 percent depending on the female P. glauca parent tree. Early characteristics and growth in Wisconsin and in New Brunswick are described. P.
H. Nienstaedt, D. P. Fowler
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