A5090922741- Plant responses to elevated CO2
- Plant Stress Responses and Tolerance
- Plant Water Relations and Carbon Dynamics
- Photosynthetic Processes and Mechanisms
- Biofuel production and bioconversion
- Horticultural and Viticultural Research
- Peatlands and Wetlands Ecology
- Remote Sensing in Agriculture
- Microbial Metabolic Engineering and Bioproduction
- Plant and animal studies
- Atmospheric chemistry and aerosols
- Light effects on plants
- Microplastics and Plastic Pollution
- Forest Insect Ecology and Management
- Spectroscopy and Chemometric Analyses
- Plant biochemistry and biosynthesis
- Forest ecology and management
- Tree-ring climate responses
- Environmental Toxicology and Ecotoxicology
- Crop Yield and Soil Fertility
- Plant responses to water stress
- Lichen and fungal ecology
- Botanical Studies and Applications
- Plant-Microbe Interactions and Immunity
- Ecology and Vegetation Dynamics Studies
University of Eastern Finland
2015-2024
UiT The Arctic University of Norway
2024
Finland University
2011-2024
Kuopio University Hospital
2013-2014
University of Helsinki
2002-2011
University of Tartu
2011
University of Turku
2009
Agrifood Research Finland
2009
Leibniz Institute of Plant Biochemistry
2005
Max Planck Institute for Chemical Ecology
2001
Our aim in this study was to determine how well phenotypic variation foliar concentrations of carbon-based secondary compounds (CBSCs) woody plants can be predicted on the basis two resource-based hypotheses, i.e. carbon-nutrient balance (CNB) and growth-differentiation (GDB) hypotheses. We conducted a meta-analysis literature data with respect responses CBSCs, carbohydrates nitrogen six types environmental manipulations (fertilization or phosphorus, shading, CO 2 enrichment, drought stress,...
Reactive oxygen species (ROS)-dependent signaling pathways from chloroplasts and mitochondria merge at the nuclear protein RADICAL-INDUCED CELL DEATH1 (RCD1). RCD1 interacts in vivo suppresses activity of transcription factors ANAC013 ANAC017, which mediate a ROS-related retrograde signal originating mitochondrial complex III. Inactivation leads to increased expression dysfunction stimulon (MDS) genes regulated by ANAC017. Accumulating MDS gene products, including alternative oxidases...
A rapid, HPLC-based screening procedure for the main classes of secondary metabolites in Nicotiana attenuata leaves (alkaloids, phenolics, and diterpene glycosides) is reported. In a single step, are extracted aqueous acidified (0.5% acetic acid) methanol, compounds separated by reversed-phase HPLC with an acidic water/acetonitrile gradient <30 min. The utility method quantifying changes after methyl jasmonate treatment plants, known to elicit resistance herbivores nature, illustrated....
Wolf-Hirschhorn syndrome (WHS) is a multiple malformation characterised by mental and developmental defects resulting from the absence of segment one chromosome 4 short arm (4p16.3). Due to complex variable expression this disorder, it thought that WHS contiguous gene with an undefined number genes contributing phenotype. In effort identify contribute human development whose results in syndrome, we have utilised series landmark cosmids characterise collection patient derived cell lines....
Short, high-concentration peaks of the atmospheric pollutant ozone (O(3)) cause formation cell death lesions on leaves sensitive plants. Numerous similarities between plant responses to O(3) and pathogens suggest that triggers hypersensitive response-like programmed (PCD). We examined superoxide-induced in O(3)-sensitive radical-induced death1 (rcd1) mutant. Dying cells O(3)-exposed rcd1 exhibited several typical morphological characteristics response PCD. Double-mutant analyses indicated a...
Summary The fatty acid hydroperoxide (HP) substrates required for the biosynthesis of jasmonic (JA) and green leaf volatiles (GLVs) are supplied by separate lipoxygenases (LOX). We silenced expression two genes downstream LOX: allene oxide synthase (AOS) HP lyase (HPL) antisense endogenous ( NaAOS , NaHPL ) in Nicotiana attenuata which JA is amplified herbivore‐specific elicitors. report that these elicitors also amplify wound‐induced GLV releases, but suppress increase transcripts,...
Abstract Reactive oxygen species (ROS) are ubiquitous signaling molecules in plant stress and development. To gain further insight into the transcriptional response to apoplastic ROS, phytotoxic atmospheric pollutant ozone was used as a model ROS inducer Arabidopsis (Arabidopsis thaliana) gene expression analyzed with microarrays. In contrast increase via hormones salicylic acid, abscisic jasmonic acid (JA), ethylene, treatment caused auxin be transiently suppressed, which confirmed DR5-uidA...
Abstract Chloroplast NADPH-thioredoxin reductase (NTRC) belongs to the thioredoxin systems that control crucial metabolic and regulatory pathways in plants. Here, by characterization of T-DNA insertion lines NTRC gene, we uncover a novel connection between chloroplast thiol redox regulation photoperiodic growth Arabidopsis (Arabidopsis thaliana). Transcript metabolite profiling revealed severe developmental defects ntrc plants grown under short 8-h light period. Besides reduced chlorophyll...
Ultraviolet (UV) radiation is an important environmental factor for plant communities; however, responses to solar UV are not fully understood. Here, we report differential effects of UV-A and UV-B on the expression flavonoid pathway genes phenolic accumulation in leaves Betula pendula Roth (silver birch) seedlings grown outdoors. Plants were exposed 30 days six treatments created using three types plastic film. Epidermal flavonoids measured vivo decreased when was excluded. In addition,...
Plant resistance to herbivores is affected both by genetic and environmental factors. The carbon–nutrient balance hypothesis (CNB) explains environmentally induced variation in constitutive delayed herbivore-induced (DIR) terms of soil fertility light regime. CNB predicts that an increase the availability nutrients (e.g., fertilization) decreases against herbivores. We tested relative roles plant genotype, defoliation, determining herbivore cloned silver birch Betula pendula Roth saplings....
We examined the chemical responses of 10 silver birch (Betula pendula) clones to fertilization and defoliation in a field experiment. In defoliation, every second leaf was removed from saplings. Three days later, two undamaged short-shoot leaves were collected, air-dried, analyzed for condensed tannins 34 nontannin phenolic compounds by high-performance liquid chromatography. The showed substantial variation composition defoliation. A cluster analysis UPGMA indicated that profiles affected...
Summary Ethylene (ET) and jasmonic acid (JA) have opposite effects on ozone (O 3 )‐induced spreading cell death; ET stimulates, is required for the death, whereas JA protects tissues. We studied underlying molecular mechanisms with O ‐sensitive, JA‐insensitive jasmonate resistant 1 ( jar1 ), ‐tolerant, ET‐insensitive ethylene insensitive 2 ein2 ) mutants. Blocking perception pharmacologically norbornadiene (NBD) in , or signaling genetically double mutant prevented spread of death. This...
Plant responses to changes in environmental conditions are mediated by a network of signaling events leading downstream responses, including gene expression and activation cell death programs. Arabidopsis thaliana RADICAL-INDUCED CELL DEATH1 (RCD1) has been proposed regulate plant stress protein-protein interactions with transcription factors. Furthermore, the rcd1 mutant defective control response apoplastic reactive oxygen species (ROS). Combining transcriptomic functional genomics...
Abstract We have used genotypic variation in birch (Betula pendula Roth) to investigate the roles of ozone (O3)-induced ethylene (ET), jasmonic acid, and salicylic acid regulation tissue tolerance O3. Of these hormones, ET evolution correlated best with O3-induced cell death. Disruption perception by transformation dominant negative mutant allele etr1-1 Arabidopsis receptor gene ETR1 or blocking 1-methylcyclopropene reduced but did not completely prevent death, when inhibition biosynthesis...
Ozone is an air pollutant that causes oxidative stress by generation of reactive oxygen species (ROS) within the leaf. The capacity to detoxify ROS and repair ROS-induced damage may contribute ozone tolerance. Ascorbate glutathione are known be key players in detoxification. effects on their biosynthesis amino acid metabolism were investigated three Euramerican poplar genotypes (Populus deltoides Bartr. × Populus nigra L.) differing sensitivity. Total ascorbate contents increased response...
Recent studies highlight a concerning reality: wildfires are becoming more frequent and intense, particularly in northern high-latitude regions where temperatures rising fastest. Boreal forests, vital carbon (C) reservoirs, play key role long-term C storage climate regulation. However, change-driven increases wildfire frequency, intensity, severity threaten to turn these soils from sinks into sources, disrupting soil biogeochemical cycles hindering forest recovery ecosystem resilience. Fire...
The phylogenetic relationships within the genus Betula (Betulaceae) were investigated using a part of nuclear ADH gene and DNA sequences chloroplast matK with parts its flanking regions. Two well-supported groups could be identified in sequence: one containing three American species B. lenta, alleghaniensis, papyrifera other including all studied. displayed more variation, main identified. In disagreement classical division Betula, schmidtii nana grouped subgenus ermanii Chamaebetula,...