A5021694553- Light effects on plants
- Plant responses to elevated CO2
- Photosynthetic Processes and Mechanisms
- Data Analysis with R
- Plant Molecular Biology Research
- Seedling growth and survival studies
- Plant Water Relations and Carbon Dynamics
- Plant Micronutrient Interactions and Effects
- Greenhouse Technology and Climate Control
- Plant Stress Responses and Tolerance
- Soil Carbon and Nitrogen Dynamics
- Plant and animal studies
- Biocrusts and Microbial Ecology
- Conferences and Exhibitions Management
- Growth and nutrition in plants
- Ecology and Vegetation Dynamics Studies
- Atmospheric Ozone and Climate
- Aluminum toxicity and tolerance in plants and animals
- Plant and Biological Electrophysiology Studies
- Impact of Light on Environment and Health
- Mycorrhizal Fungi and Plant Interactions
- Remote Sensing in Agriculture
- Optical Imaging and Spectroscopy Techniques
- Health, Environment, Cognitive Aging
- Plant Physiology and Cultivation Studies
University of Helsinki
2016-2025
Institut de Biologia Evolutiva
2018
Beijing Institute of Optoelectronic Technology
2015-2016
University of Eastern Finland
1997-2012
University of Tartu
2012
University of Glasgow
2012
Massey University
2012
Biocenter Finland
2010
University of Jyväskylä
2002-2006
Joensuu Science Park
2006
The sunlight received by plants is affected cloudiness and pollution. Future changes in cloud cover will differ among regions, while aerosol concentrations are expected to continue increasing globally as a result of wildfires, fossil fuel combustion, industrial Clouds aerosols increase the diffuse fraction modify spectral composition incident solar radiation, both affect photosynthesis terrestrial ecosystem productivity. Thus, an assessment how canopy leaf-level processes respond these...
Abstract. The objective of the work reported was to answer following questions: (1) Do stomata respond both humidity and temperature? (2) these responses interact in such a way that relative at leaf surface is more appropriate variable than water vapour saturation deficit yields simpler description compound response? To questions, we measured response conductance under constant temperature, increasing temperature deficit. We found that, Hedera helix subsp. canariensis (Willd.) Coutinho,...
Abstract Photomorphogenic responses triggered by low fluence rates of ultraviolet B radiation (UV-B; 280–315 nm) are mediated the UV-B photoreceptor UV RESISTANCE LOCUS8 (UVR8). Beyond our understanding molecular mechanisms perception UVR8, there is still limited information on how UVR8 pathway functions under natural sunlight. Here, wild-type Arabidopsis (Arabidopsis thaliana) and uvr8-2 mutant were used in an experiment outdoors where UV-A (315–400 irradiances attenuated using plastic...
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,...
Abstract About 95% of the ultraviolet (UV) photons reaching Earth’s surface are UV-A (315–400 nm) photons. Plant responses to radiation have been less frequently studied than those UV-B (280–315 radiation. Most previous studies on used an unrealistic balance between UV-A, UV-B, and photosynthetically active (PAR). Consequently, results from these difficult interpret ecological perspective, leaving important gap in our understanding perception solar UV by plants. Previously, it was assumed...
Plants generate and perceive informational signals. An interaction (between plants) is considered to be when it involves the exchange of an insignificant amount matter or energy, in quantitative terms, but spite this has a profound effect on plants by modulating their developmental programme. This article discusses how 'use' light signals detect neighbouring outlines implications shade-avoidance responses for development size fitness hierarchies canopies. The role shade avoidance as...
Plants synthesize phenolic compounds in response to certain environmental signals or stresses. One large group of phenolics, flavonoids, is considered particularly responsive ultraviolet (UV) radiation. However, here we demonstrate that solar blue light stimulates flavonoid biosynthesis the absence UV-A and UV-B We grew pea plants (Pisum sativum cv. Meteor) outdoors, Finland during summer, under five types filters differing their spectral transmittance. These were used (1) attenuate UV-B;...
Plant defence theories have recently evolved in such a way that not only the quantity but also quality of mineral nutrients is expected to influence plant constitutive defence. Recently, an extended prediction derived from protein competition model (PCM) suggested nitrogen (N) limitation more important for production phenolic compounds than phosphorus (P). We aimed at studying sexual differences patterns carbon allocation growth and relation N P availability Populus tremula L. seedlings....
Cryptochromes (CRYs) and UV RESISTANCE LOCUS 8 (UVR8) photoreceptors perceive UV-A/blue (315-500 nm) UV-B (280-315 radiation in plants, respectively. While the roles of CRYs UVR8 have been studied separate controlled-environment experiments, little is known about interaction between these photoreceptors. Here, Arabidopsis wild-type Ler, photoreceptor mutants (uvr8-2, cry1cry2 cry1cry2uvr8-2), a flavonoid biosynthesis-defective mutant (tt4) were grown sun simulator. Plants exposed to filtered...
The photoreceptors UV RESISTANCE LOCUS 8 (UVR8) and CRYPTOCHROMES 1 2 (CRYs) play major roles in the perception of UV-B (280-315 nm) UV-A/blue radiation (315-500 nm), respectively. However, it is poorly understood how they function sunlight. UVR8 CRYs were assessed a factorial experiment with Arabidopsis thaliana wild-type photoreceptor mutants exposed to sunlight for 6 or 12 hr under five types filters cut-offs blue-light regions. Transcriptome-wide responses triggered by UV-A wavelengths...
Plants rely on spectral cues present in their surroundings, generated by the constantly changing light environment, to guide growth and reproduction. Photoreceptors mediate capture of information plants from environment over a wide range wavelengths, but despite extensive evidence that respond various cues, only fragmentary data have been published showing patterns diurnal, seasonal geographical variation composition daylight. To illustrate photon ratios, we measured time series irradiance...
ABSTRACT The natural variation in quantity and quality of light modifies plant morphology, growth rate concentration biochemicals. aim two growth‐room experiments was to study the combined effects red (R) far‐red (FR) ultraviolet‐B (UV‐B) radiation on concentrations leaf phenolics morphology silver birch ( Betula pendula Roth) seedlings. Analysis by high‐performance liquid chromatography showed that leaves exposed supplemental FR relative R contained higher total chlorogenic acids a cinnamic...
Abstract The effects of long‐term elevated UV‐B radiation on silver birch ( Betula pendula Roth) seedlings were studied over three growing seasons in an outdoor experiment Finland started 64 days after germination. One group was exposed to a constant 50% increase CIE radiation, which corresponds 20–25% ozone depletion; another received small UV‐A and third (the control group) ambient solar radiation. Changes growth appeared during the season; stems treated thinner their height tended be...
Summary Changes in secondary metabolites silver birch ( Betula pendula ) seedlings are presented response to ultraviolet‐B radiation (UV‐B) and nutrient addition. Concentrations of individual nutrients were measured leaves greenhouse‐grown exposed five time‐integrated irradiances biologically effective UV‐B (I BE fertilized with two relative addition rates. Several phenolics not only induced by UV‐B, but their concentration was dependent on daily irradiance. Relative rate also affected the...
Soil temperature is a main factor limiting root growth in the boreal forest. To simulate possible soil-warming effect of future climate change, 5-year-old Norway spruce (Picea abies (L.) Karst.) seedlings were subjected to three simulated growing seasons controlled environment rooms. The acclimated soil 16 degrees C during first (GS I) and third III), but assigned random soil-temperature treatments 9, 13, 18 21 second season II). In GS II, shoot diameter was lowest treatment 9 treatment....
Abstract We measured the concentrations of ultraviolet (UV)‐absorbing phenolics varying in response to exclusion either solar UV‐B or both UV‐A and radiations leaves grey alder ( Alnus incana ) white birch Betula pubescens trees under field conditions. In 20 13 different phenolic metabolites were identified. The UV varied between within groups tree species. changes concentration for some suggest effects only UV‐B, which band being effective depending on metabolite. For other metabolites,...