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pinus sylvestris/atrophie
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11 résultats
Degeneration pattern in somatic embryos of Pinus sylvestris L.
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Somatic embryos can be used for propagating forest trees vegetatively, which is of great importance for capturing the genetic gain in breeding programs. However, many economically important Pinus species are difficult or impossible to propagate via somatic embryogenesis. In order to get a better
[Variability of the cytological parameters of Pinus sylvestris L. seeds from the unique Hrenovskoy pine forest].
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Hrenovskoy pine forest is a unique island stand at the boundary of the species range of Scots pine Pinus sylvestris L. This object is of exceptional economic value, because it serves as a forest-seed base for the Voronezh oblast and some other regions of Russia; therefore, the stand and seed
Scots pine needle surfaces on radial transects across the north boreal area of Finnish Lapland and the Kola Peninsula of Russia.
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To gain an understanding of the characteristics of the needle surfaces of naturally regenerated Scots pine (Pinus sylvestris L.) and their geographical distribution, eight physicochemical variables were investigated within the north boreal forest area. The visibly undamaged needles were collected in
Type I and type II genes for the chlorophyll a/b-binding protein in the gymnosperm Pinus sylvestris (Scots pine): cDNA cloning and sequence analysis.
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A cDNA library was constructed from mRNA prepared from light-treated seedlings of Scots pine (Pinus sylvestris L.) and cDNAs for the chlorophyll a/b-binding protein LHC-II were identified using a pea gene as the heterologous probe. Three cDNA clones were sequenced. The deduced amino acid sequences
Chitinase production in pine callus (Pinus sylvestris L.): a defense reaction against endophytes?
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In shoot tip-derived tissue cultures of Scots pine (Pinus sylvestris L.), browning and subsequent degeneration of the culture is accompanied by lipid peroxidation and lignification of cells, which are characteristic features of a plant defense reaction. Since chitinases are enzymes acting primarily
Bioactive Properties of the Aqueous Extracts of Endophytic Fungi Associated with Scots Pine (Pinus sylvestris) Roots
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Despite the continuing interest in various plant and natural products, only a small portion of the biologically active compounds from nature has been discovered and exploited. In this study, antioxidant and antibacterial properties of aqueous fractions of three endophytic fungi isolated from the
Wood anatomy and carbon-isotope discrimination support long-term hydraulic deterioration as a major cause of drought-induced dieback.
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Hydraulic impairment due to xylem embolism and carbon starvation are the two proposed mechanisms explaining drought-induced forest dieback and tree death. Here, we evaluate the relative role played by these two mechanisms in the long-term by quantifying wood-anatomical traits (tracheid size and area
Monitoring of the Phytosanitary State of Navarra's Forests, Spain.
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Between 1988 and 1993 six surveys on the condition of forests in Navarra (North Spain) were carried out. The results, relating to 408 trees in 17 sampling points, showed that the overall percentage of damaged trees increased from 2.86% in 1988 to 18.6% in 1993, which indicates a general large-scale
Haloacetic acids, phytotoxic secondary air pollutants.
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Haloacetic acids are atmospheric oxidation products of airborne C2-halocarbons which are important solvents and propellants. Levels of trichloroacetate (TCA) in conifer needles from mountain ranges in Germany (Black Forest, Erzgebirge) and from two sites in Finland are compared; TCA is present in
Litter quality indirectly influences community composition, reproductive mode and trophic structure of oribatid mite communities: a microcosm experiment.
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Our knowledge of the assembly processes of species-rich oribatid mite communities is fairly limited. Also, very little information is available on the effects of habitat factors on these processes. In this paper, the role of litter quality in pattern formation was investigated in a microcosm
Evidence from nitrogen fertilisation in the forests of Germany.
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In the first part, this contribution presents German results of nitrogen fertilisation experiments on stand growth, published 1958-1987. Over this period Norway spruce and Scots pine have generally responded positively to nitrogen fertilisation, without showing signs of damage, at levels up to at
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