Ingmar Tulva

Ingmar Tulva
University of Tartu · Faculty of Economics and Business Adminstration

About

25
Publications
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886
Citations

Publications

Publications (25)
Article
Environmental conditions and photoperiod length drive the seasonal variability of gas exchange in plants. Still, little is known about trees’ adaptation to climate change, expressed as a delay in decreasing photosynthetic capacity at the end of the growing season. We investigated the effect of elevated air humidity (RH) and sampling period (from Ju...
Article
Optimization between photosynthetic carbon assimilation and stomatal water loss is the key in order to breed crops for future climate. We analyzed stomatal conductance (gs), CO 2 assimilation rate (Anet), fungal diseases, grain yield and yield components of seven European malting barley genotypes treated with fungicides alone or together with biost...
Article
Full-text available
Guard cells shrink and close stomatal pores when air humidity decreases (i.e. when the difference between the vapor pressures of leaf and atmosphere [VPD] increases). The role of abscisic acid (ABA) in VPD-induced stomatal closure has been studied using ABA-related mutants that respond to VPD in some studies and not in others. The importance of ABA...
Article
Full-text available
Guard cells shrink and close stomatal pores when air humidity decreases, i.e. when the difference between the vapor pressures of leaf and atmosphere (VPD) increases. The role of abscisic acid (ABA) in VPD-induced stomatal closure has been studied using ABA-related mutants that respond to VPD in some studies and not in others. The importance of ABA...
Article
Full-text available
Although night-time water relations have been studied in different plant species in the last decade, there is limited information about the impact of climate variables on endogenous regulation of night-time water relations in trees. The aim of the current study was to elucidate how long-term exposure to increased air humidity impacts night-time gas...
Article
Full-text available
Background and aimsThe majority of terrestrial plant species associate with arbuscular mycorrhizal (AM) fungi, to exchange carbon compounds with nutrients. However, the factors that determine the composition of AM fungal communities in individual plant roots remain poorly understood. We hypothesized that AM fungal communities are simultaneously inf...
Poster
Full-text available
The predicted increase of atmospheric temperatures, precipitation and therefore also air humidity in northern latitudes will have a significant influence in plants’ growth and functioning. Accessing different primary data is most valuable to put up modes for future to increase forests’ management manners and contribution to carbon sinks. There has...
Article
Key message Elevated atmospheric humidity reduced bud size by restricting primordium growth and increased the frequency of bud break in fast-growing deciduous trees, but the responses are species-specific. Abstract The initiation, development, and growth potential of buds determine the structure of a tree crown. Climate change scenarios project...
Article
Full-text available
Vapaavuori, Elina Holopainen, Jarmo K. Holopainen, Toini Julkunen-Tiitto, Riitta Kaakinen, Seija Kasurinen, Anne Kontunen-Soppela, Sari Kostiainen, Katri Oksanen, Elina Peltonen, Petri Riikonen, Johanna Tulva, Ingmar
Article
Full-text available
Rapid stomatal closure induced by changes in the environment, such as elevation of CO2, reduction of air humidity, darkness and pulses of air pollutant ozone (O3), involves the SLAC1 anion channel. SLAC1 is activated by OST1 and Ca2+-dependent protein kinases. OST1 activation is controlled through abscisic acid (ABA)-induced inhibition of PP2C prot...
Article
A facility for free air humidity manipulation (FAHM) was established to investigate the effect of increased air humidity on trees’ performance and their canopy functioning with respect to rising air humidity predicted for Northern Europe. The FAHM system enables air relative humidity (RH) to be increased up to 18 units (%) over the ambient level du...
Article
We examined the effect of elevated CO2 on photosynthesis and the allocation of leaf nitrogen to photosynthetic and non-photosynthetic pools in two poplar species (Populus alba, genotype 2AS11 and P. nigra, genotype Jean Pourtet) at the POP-EUROFACE site. In P. alba, the light-saturated photosynthetic rate at growth CO2 concentration (Asat) over two...
Article
This review summarizes the main results from a 3-year open top chamber experiment, with two silver birch (Betula pendula Roth) clones (4 and 80) where impacts of 2x ambient [CO2] (EC) and [O3] (EO) and their combination (EC + EO) were examined. Growth, physiology of the foliage and root systems, crown structure, wood properties, and biological inte...
Article
Needle nitrogen partitioning and photosynthesis of Norway spruce were studied in a forest chronosequence in Järvselja Experimental Forest, Estonia. Current- and previous-year shoots were sampled from upper and lower canopy positions in four stands, ranging in age from 13 to 82years. A/c i curves were determined to obtain maximum carboxylation rate...
Article
Full-text available
Questions: What is the contribution of management continuity during the last 30–40 years to variation in species diversity and composition of a calcareous wooded meadow plant community? Is tree cover related to species diversity and composition of the herbaceous layer? What are the effects of local soil gradients on species diversity?Location: Lael...
Article
Full-text available
Two silver birch clones were exposed to ambient and elevated concentrations of CO(2) and O(3), and their combination for 3 years, using open-top chambers. We evaluated the effects of elevated CO(2) and O(3) on stomatal conductance (g(s)), density (SD) and index (SI), length of the guard cells, and epidermal cell size and number, with respect to cro...
Article
The long-term response of leaf photosynthesis to rising CO2 concentrations [CO2] depends on biochemical and morphological feedbacks. Additionally, responses to elevated [CO2] might depend on the nutrient availability and the light environment, affecting the net carbon uptake of a forest stand. After 6 yr of exposure to free-air CO2 enrichment (EURO...
Article
A poplar plantation has been exposed to an elevated CO2 concentration for 5 years using the free air CO2 enrichment (FACE) technique. Even after such a long period of exposure, leaves of Populus x euramericana have not shown clear signs of photosynthetic acclimation. Only at the end of the growing season for shade leaves was a decrease of maximum v...
Article
We used a canopy growth model as a scaling tool to make canopy level predictions on leaf area index (LAI) and leaf area distribution from short-term measurements of 8-year-old Betula pendula Roth trees of two clones in an open-top chamber experiment with elevated CO2 and ozone treatments. The model approximates the canopy as a population of growing...
Article
Here, the aim was to estimate loads imposed on the apoplastic ascorbate (ASC) pool by enzymatic and nonenzymatic reactions in Betula pendula exposed to doubled CO2 and O3 concentrations in open-top chambers. Leaf apoplastic extracts were analysed for peroxidase and oxidase activities in vitro, using different substrates. Partial loads in vivo were...
Article
Elevated CO(2) and ozone effects were studied singly and in combination on the crown structure of two Betula pendula clones. Measurements were made at the end of the second fumigation period in an open-top-chamber experiment with 9-year-old trees. Shoot ramification (number of long and short daughter shoots), shoot length, and number of metamers, l...
Article
We investigated shoot growth patterns and their relationship to the canopy radiation environment and the distribution of leaf photosynthetic production in a 27-m-tall stand of light-demanding Populus tremula L. and shade-tolerant Tilia cordata Mill. The species formed two distinct layers in the leaf canopy and showed different responses in branch a...
Article
We developed a canopy growth model to analyse the importance of different structural properties in the formation of equilibrium leaf area index in a Poputus tremula canopy. The canopy was divided into vertical layers with the growth and structural parameters of each layer dependent on light conditions. Horizontal heterogeneity was considered throug...

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