| methyl jasmonate and oxalic acid treatment of norway spruce: anatomically based defense responses and increased resistance against fungal infection. | to study the effect of chemical pretreatment on conifer resistance, 13-year-old norway spruce (picea abies (l.) karst.) trees were treated with methyl jasmonate (mj) or oxalic acid (oxa) on the outer bark and inoculated with the pathogenic blue-stain fungus ceratocystis polonica (siem.) c. moreau 4 weeks later. both chemicals significantly reduced symptoms of fungal infection, but mj was more effective than oxa (51 versus 18% reduction in length of necrotic lesions in the phloem relative to untr ... | 2008 | 17938111 |
| mollusc grazing may constrain the ecological niche of the old forest lichen pseudocyphellaria crocata. | this study reports on mollusc grazing of two epiphytic cyanobacterial lichens (pseudocyphellaria crocata and lobaria pulmonaria) transplanted within three picea abies-dominated boreal rain forest stands (clear-cut, young and old forests) in west central norway. grazing was particularly high in transplants located in the old forest and was almost absent in clear-cut transplants. grazing marks were absent on natural thalli on nearby spruce twigs (required creeping distance for mollusc from the gro ... | 2008 | 18950428 |
| significance of ozone exposure for inter-annual differences in primary metabolites of old-growth beech (fagus sylvatica l.) and norway spruce (picea abies l.) trees in a mixed forest stand. | the influence of long-term free-air ozone fumigation and canopy position on leaf contents of total glutathione, its redox state, non-structural proteins (nsp), soluble amino compounds, and total soluble sugars in old-growth beech (fagus sylvatica) and spruce (picea abies) trees were determined over a period of five years. ozone fumigation had weak effects on the analysed metabolites of both tree species and significant changes in the contents of total glutathione, nsp, and soluble sugars were ob ... | 2007 | 17357017 |
| effects of red, far-red and blue light in maintaining growth in latitudinal populations of norway spruce (picea abies). | seedlings of trees with a free growth pattern cease growth when night-lengths become shorter than a critical value, and this critical night-length (cnl) decreases with increasing latitude of origin. in northern populations, the light quality also appears to play an important role and a clinal variation in requirement for far-red (fr) light has been documented. in this study we dissected the light quality requirements for maintaining growth in different latitudinal populations of norway spruce (p ... | 2006 | 17080632 |
| wood-inhabiting fungal communities in woody debris of norway spruce (picea abies (l.) karst.), as reflected by sporocarps, mycelial isolations and t-rflp identification. | wood-inhabiting fungi play a key role in forest ecosystems and constitute an essential part of forest biodiversity. we therefore examined the composition and abundance of wood-inhabiting fungi by three methods: sporocarp counts, mycelial culturing and direct amplification of internal transcribed spacer terminal restriction fragment length polymorphism from wood combined with sequencing of reference rdna. seven-year-old slash piles left after a thinning were analyzed in a 50-year-old norway spruc ... | 2006 | 16420615 |
| pronounced ecological separation between two closely related lineages of the polyporous fungus gloeoporus taxicola. | gloeoporus taxicola is a saprotrophic polypore that produces annual fruit bodies, in scandinavia exclusively on coniferous wood. in this study, we demonstrate the existence of two ecotypes of g. taxicola in norway; a coastal lowland form fruiting on dead logs and dying branches of standing pinus sylvestris, and a highland form largely fruiting on trunks of picea abies in moist, old-growth forests. thus, a distinct ecological separation has happened between the two forms both concerning substrate ... | 2007 | 17590324 |