A5026377785- Forest ecology and management
- Forest Insect Ecology and Management
- Ecology and Vegetation Dynamics Studies
- Plant responses to elevated CO2
- Plant Water Relations and Carbon Dynamics
- Botany and Plant Ecology Studies
- Bioenergy crop production and management
- Forest Ecology and Biodiversity Studies
- Animal Ecology and Behavior Studies
- Atmospheric chemistry and aerosols
- Seedling growth and survival studies
- Tree-ring climate responses
- Plant Stress Responses and Tolerance
- Plant and animal studies
- Forest Management and Policy
- Fire effects on ecosystems
- Light effects on plants
- Yeasts and Rust Fungi Studies
- Botanical Studies and Applications
- Turfgrass Adaptation and Management
- Plant biochemistry and biosynthesis
- Insect-Plant Interactions and Control
- Plant Pathogens and Fungal Diseases
- Genetic diversity and population structure
- Seed Germination and Physiology
Natural Resources Institute Finland
2012-2023
Finnish Environment Institute
1987-2015
University of Helsinki
2011
Northern Arizona University
1999
Joensuu Science Park
1997
University of Turku
1987
Forest Research Institute
1987
Silver birch (Betula pendula) is a pioneer boreal tree that can be induced to flower within 1 year. Its rapid life cycle, small (440-Mb) genome, and advanced germplasm resources make an attractive model for forest biotechnology. We assembled chromosomally anchored the nuclear genome of inbred B. pendula individual. Gene duplicates from paleohexaploid event were enriched transcriptional regulation, whereas tandem overrepresented by environmental responses. Population resequencing 80...
Northern forest trees are challenged to adapt changing climate, including global warming and increasing tropospheric ozone (O3) concentrations. Both elevated O3 temperature can cause significant changes in volatile organic compound (VOC) emissions as well leaf anatomy that be related adaptation or increased stress tolerance, signs of damage. Impacts moderately (1.3× ambient) (ambient + 1 °C), alone combination, on VOC structure two genotypes (2.2 5.2) European aspen (Populus tremula L.) were...
Volatile organic compounds (VOCs) are expected to have an important role in plant adaptation high temperatures. The impacts of increasing night-time temperature on daytime terpenoid emissions and related gene expression silver birch (Betula pendula) European aspen (Populus tremula) clones were studied. plants grown under five different temperatures (6, 10, 14, 18, 22 degrees C) while was kept at a constant C. VOC collected during the analysed by gas chromatography-mass spectrometry (GC-MS)....
See also the Commentary by Lev‐Yadun and Keasar
Abstract Physiological and chemical responses of 17 birch ( Betula pendula Roth) clones to 1.5–1.7 × ambient ozone were studied in an open‐field experiment over two growing seasons. The saplings for growth, foliar visible injuries, net photosynthesis, stomatal conductance, chlorophyll, carotenoid, Rubisco, total soluble protein, macronutrient phenolic concentrations leaves. Elevated resulted growth enhancement, changes shoot‐to‐root (s/r) ratio, reduced lower late‐season nutrient imbalance,...
In the present experiment, single and combined effects of elevated temperature ozone (O3) on four silver birch genotypes (gt12, gt14, gt15 gt25) were studied in an open-air field exposure design. Above- below-ground biomass accumulation, stem growth soil respiration measured 2008. addition, a 13C-labelling experiment was conducted with trees. After second season, increased above- rates. However, some these variables showed that effect modified by tree genotype prevailing O3 level. For...
Elevations of carbon dioxide, temperature and ultraviolet-B (UBV) radiation in the growth environment may have a high impact on accumulation plants, different factors work opposite directions or induce additive effects. To detect changes phytochemistry silver birch (Betula pendula) seedlings, six genotypes were exposed to combinations ambient elevated levels CO2 , UVB top-closed chambers for 7 weeks. The relatively similar their responses, no significant interactive effects three-level...
We studied the between-tree and within-tree variation in composition content of foliar low-molecular-weight phenolics (LMWP) European white birch (Betula pendula Roth) during unfolding vegetative buds early leaf development. In buds, major groups phenolic compounds were hydrolysable tannins flavonoid aglycones, whereas, later development, glycosides accounted for most total LMWP. The LMWP, as well individual compounds, varied largely among trees, while within an tree was low. biosynthetic...
The palatability of the birch Betula pendula to snowshoe hare Lepus timidus differed considerably depending on geographical origin and family. seedlings platyphylla were more resistant than any tested seed lot B. pendula. preference hares for lots individual was strongly negatively correlated with number resin droplets surface bark. There no indications a trade-off between growth defense; contrary, tallest also most resistant. Nor did our material provide support hypothesis carbon-nutrient...
Seedling representing four families of European white birch (Betula pendula) were grown through their first growing season in two fertilization and three shading treatments. The growth responses seedlings measured, after complete winter hardening the basal parts offered to voles (Microtus agrestis) top same fed hares (Lepus timidus). response 1—yr—old was family specific. Nitrogen generally increased biomass accretion palatability voles. Fertilization significantly decreased resistance only...
Phenology can have a profound effect on growth and climatic adaptability of northern tree species. Although the large interannual variations in dates bud burst termination been widely discussed, little is known about genotypic spatial phenology how these sources variation are related to temporal variation. We measured eight white birch (Betula pendula Roth) clones two field experiments daily over 6 years, determined for same 2 years. also yearly height growth. found considerable genetic...
Within-population variation in phenology of boreal trees indicates their adaptability to climatic variations. Although interannual variations date bud burst have been widely discussed, little is known about within-population variation, the key determinants for this and effects on estimates trends date. Over a period nine years, we monitored timing daily 30 mature white birch (Betula pendula Roth) naturally regenerated stand. Our results revealed not only large but also considerable...
Rising temperature and tropospheric ozone (O3) concentrations are likely to affect carbon assimilation processes thus the sink strength of trees. In this study, we investigated joint action elevated on silver birch (Betula pendula) European aspen (Populus tremula) saplings in field conditions by combining free-air exposure (1.2 × ambient) infrared heaters (ambient +1.2 °C). At leaf level measurements, decreased net photosynthesis (Pn), while response was dependent position within foliage....
Abundant secondary metabolites, such as condensed tannins, and their interpopulation genotypic variation can remain through plant leaf senescence affect litter decomposition. Whether the intrapopulation of a more diverse assortment metabolites equally persists decomposition is not well understood. We analysed concentrations intracellular phenolics, epicuticular flavonoid aglycones, triterpenoids, tannins lignin in green leaves, senescent leaves partly decomposed silver birch, Betula pendula....
Climate warming is anticipated to make high latitude ecosystems stronger C sinks through increasing plant production. This effect might, however, be dampened by insect herbivores whose damage plants at their background, non-outbreak densities may more than double under climate warming. Here, using an open-air experiment among Subarctic birch forest field layer vegetation, supplemented with plantlets, we show that a 2.3 °C air and 1.2 soil temperature increase can advance the growing season...
Non-native forest tree species have been introduced in Europe since the 16th century, but only second half of 20th century significance seed source origin for their economic use was recognized, resulting establishment numerous provenance trials at a national, regional, European and International level, as those led by IUFRO. Breeding programs also launched continent most economically important species. Aim this work is formulation recommendations planting five non-native (Douglas fir, grand...