Use this url to cite researcher: https://hdl.handle.net/20.500.12259/154548
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  • research article
    Gudynaitė-Franckevičienė, Valda
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    Baltic forestry. Girionys : Lietuvos agrarinių ir miškų mokslų centras. Miškų institutas et al., 2020, vol. 26, no. 2, p. 157-169
    To meet the needs of carbon sequestration and production of raw materials from renewable natural resources for the timber market of the European Union, it is necessary to expand forest plantation areas. The efficiency of short rotation forestry depends primarily on the selection of hybrids and clones, suitable for the local environmental conditions. We postulate that ecogenetic response, ecogenetic plasticity and genotypic variation of different hybrids of poplars (Populus L.) depend both on the type of stressors (spring frosts, summer drought, increased UV-B radiation, warm winters) and peculiarities of the cross-bred species as well as on their genetic preadaptations to native environmental conditions of their origin. The aim of the study was to estimate the ecogenetic plasticity, genotypic variation of adaptive traits and adaptability of Populus hybrids under simulated conditions of the expected climate change. The research was performed with the cultivars and experimental clones of three different intraspecific hybrids of poplars (P. nigra L., P. deltoides Bartr. ex Marsh, and P. trichocarpa Torr. & Gray.) and four interspecific hybrids of poplars (P. deltoides L. × P. nigra, P. deltoides × P. trichocarpa, P. maximowiczii A. Henry × P. trichocarpa, and P. balsamifera L. × P. trichocarpa). Simulated spring frosts and summer drought treatments had a substantial impact on growth of trees, but the hybrid and clone effects were also significant and showed that many hybrids and clones in general retain their features/differences under stressful environmental conditions. A strongly expressed hybrid and clone interactions with simulated frost and drought effects (genotype-environment interaction, G × E) showed different ecogenetic response, plasticity and specific ecological preferences of the clones and hybrids. The sensitivity of hybrids to UV-B radiation varied and depended on the origin of their [...]
    WOS© Citations 1  31Scopus© Citations 3
  • research article ;
    Bajerkevičienė, Gintarė
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    Labokas, Juozas
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    Lygis, Vaidotas
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    Jankauskienė, Jurga
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    Verbylaitė, Rita
    Baltic forestry. Girionys : Lietuvos agrarinių ir miškų mokslų centras. Miškų institutas et al., 2020, vol. 26, no. 1, p. 1-14
    The aim of the study was to assess changes in performance and competition for light of juveniles of seven forest tree species, Pinus sylvestris, Picea abies, Betula pendula, Alnus glutinosa, Populus tremula, Quercus robur and Fraxinus excelsior, grown in mono-species and mixed cultures with isolated potted roots under the impact of different combinations of climate change-related stressors, simulated in a phytotron under the elevated CO2 concentration during one growing season, as follows: i) heat + elevated humidity (HW); ii) heat + frost + drought (HFD); iii) heat + elevated humidity + increased UV-B radiation doses + elevated ozone concentration (HWUO); and iv) heat + frost + drought + increased UV-B radiation doses + elevated ozone concentration (HFDUO). For the mixed cultures, three typical species' mixtures were used: i) P. sylvestris, B. pendula and P. abies, ii) P. abies, B. pendula and Q. robur and iii) F. excelsior, A. glutinosa and P. tremula. For the control, the same material was grown outside the phytotron in ambient conditions. Analysis of variance (ANOVA) revealed that the effects of the complex treatments, species and species by treatment interactions were highly significant in most of the biomass, growth, physiological and biochemical traits studied. Pattern of species culture had highly significant effect on physiological and biochemical traits (except for H2O2 concentration); meanwhile it was of low significance for biomass and growth traits. Pattern of species culture by treatment interaction was highly significant in all traits, suggesting that the effects of the applied complex treatments vary depending on the pattern of species culture. Under the hot wet conditions the highest stem volume index, tree biomass, and growth were observed in deciduous P. tremula, A. glutinosa and B. pendula with more clearly pronounced differences in performance between different patterns of species cultures than in ambient conditions showing that the[...]
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  • research article ;
    Jankauskienė, Jurga
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    Bajerkevičienė, Gintarė
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    Lygis, Vaidotas
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    Labokas, Juozas
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    Verbylaitė, Rita
    Journal of plant research Tokyo : Springer Japan KK, 2019, vol. 132, iss. 6, p. 789-811
    Compared to control, intrinsic water use efficiency in all treatments was significantly lower in P. tremula, A. glutinosa and F. excelsior and higher in conifers P. sylvestris and P. abies. Significant population-by-treatment interactions found for most traits showed variation in response of populations, implying that this reflects adaptive potential of each tree species. The observed responses may not always be considered as adaptive as deteriorating growth of some populations or species may lead to loss of their competitiveness thus compromising regeneration and natural successions.
    WOS© Citations 3  88Scopus© Citations 3
  • research article ;
    Jankauskienė, Jurga
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    Lygis, Vaidotas
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    Bajerkevičienė, Gintarė
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    Verbylaitė, Rita
    iForest-Biogeosciences and Forestry. Potenza : Societa Italiana di Selvicoltura ed Ecologia Forestale, 2018, vol. 11, p. 374-388
    Photosynthetic rate was highest in P. tremula, B. pendula and A. glutinosa , however it was much more negatively affected by water deficit in these three species than in other tested species. In most cases, drought had a negative effect on production of pigments in deciduous tree species, which, together with increased amounts of malondialdehyde and hydrogen peroxide, indicated a presence of an oxida - tive stress. Significant population effect and population-by-treatment interac - tions found for most traits showed different plasticity and response of tree populations to the treatments. Although, only 19% of the populations showed significant ecovalencies. Some of the observed reactions may not be consid - ered as adaptive acclimation as decreasing growth of some species and popula - tions indicates deteriorating performance which may lead to changes in their competitiveness, thus compromising regeneration, persistence of natural suc - cessions and sustainability of forest ecosystems.
    WOS© Citations 4  69
  • research article ; ;
    Labokas, Juozas
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    Lygis, Vaidotas
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    Dobrowolska, Dorota
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    Jankauskienė, Jurga
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    Verbylaitė, Rita
    Baltic Forestry. Girionys : Lithuanian Forest Research Institute et all, 2018, Vol. 24, N 1, p. 131-147
    windthrows
      84WOS© Citations 1
  • book part ;
    Bakys, Remigijus
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    Marčiulynienė, Diana
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    Gustienė, Alma
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    Verbyla, Vidmantas
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    Lygis, Vaidotas
    Dieback of European Ash (Fraxinus spp.): Consequences and Guidelines for Sustainable Management. Uppsala : Swedish University of Agricultural Sciences, 2017, p. 150-165
    Future research needs include studies of ash regeneration potential in forest stands, and revealing genetic diversity in and structure of the naturally regenerating F. excelsior populations. Moreover, studies of natural forest succession in dieback - affected but not further managed F. excelsior stands are highly desired. As options of effective management of the devastated stands and means for disease control are still quite limited, the research will focus on one of the most promising options to save ash - its selection and breeding for resistance against H. fraxineus.
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  • Publication
    Skirtingų tuopų hibridų ir klonų plastiškumas ir genetinė variacija dėl stipriai išreikštų stresorių - dirbtinių šalnų ir sausrų
    [Plasticity and genetic variation of different poplar hybrids and clones under effect of severe stressors-simulated frost and drought]
    research article
    Gudynaitė, Valda
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    Miškininkystė. , 2016, Nr. 1 (79), p. 29-47
    Significant hybrid X frost (GH X E), clone X frost (GK X E), hybrid x drought (GH x E) and clone x drougl (Gk x E) interactions demonstrated different plasticity and response to frost and drought of hybrids and clones. Cloni of interspecific hybrids of P. nigra, P. trichocarpa and P. deltoides suffered the smallest losses due to spring frost ar summer drought. Experimental clones and cultivars of P. maximoviczii X P. trichocarpa, P. balsamifera x P. trichocarp and P. deltoides x P. trichocarpa hybrids were of best growth under normal conditions, but suffered large losses due I frost and drought. These our tested hybrid clones and cultivars can be recommended for growing in the areas where is r significant danger of frost. The best growth performance under normal conditions were shownby the 'Degroso' and U I delta x nigra clones. On sites with frost risk it would be better to grow the 'Casale' and Gra It 8 clones. On sites wil drought risk it is better to grow clones Gra F 488 and UK I delta x nigra. The clones Gra Xe 3 and 'Degroso' demons rated the minimum mortality under all treatments.
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  • research article ;
    Lygis, Vaidotas
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    Marčiulynienė, Diana
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    Bakys, Remigijus
    iForest-Biogeosciences and Forestry. Potenza : Societa Italiana di Selvicoltura ed Ecologia Forestale, 2016, vol. 9, no. 1, p. 12-22
    Substantially increased coefficients of additive genetic variation and heritability in health condition following both frost and drought treatments and compared to control showed that simulated stress conditions may noticeably contribute to expression of differences among the tested F. excelsior families in their resistance traits, thus enabling a better evaluation of performance of different families, an effective family selection for resistance, and achievement of a marked genetic gain.
    WOS© Citations 17  53Scopus© Citations 18
  • research article ;
    Grigaliūnas, Vaidotas
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    Baltic Forestry. Girionys : Lithuanian Forest Research Institute et all, 2015, Vol. 21, N 1, p. 152-161
    The objective of this study was to evaluate natural forest regeneration in cutovers on drained fens (eutrophic and mesotrophic low moor peat soils) depending on intensity of drainage characterised by depth of the ground water table, coverage of ground by vegetation and soil chemical properties (soil acidity and saturation with bases). The data were collected in 172 sample plots established in transects located perpendicular to drainage ditches at different distance to it. The assessments were carried out in 2003-2007 in the Panevėžys and Biržai state forest enterprises. It was found that downy birch (Betula pubescens) seedlings dominated in cutovers on eutrophic and mesotrophic fens. The density of seedlings was greatest (3,700-5,300 trees per ha) on undrained and extensively drained cutovers where ground water table depth (h5) at the beginning of growth period was 1-20 cm. Black alder (Alnus glutinosa) seedlings were most abundant (1,000-1,300 trees per ha) in undrained and extensively drained cutovers on eutrophic peatlands where ground water level at the beginning of growth period is above the soil surface (10 cm) or near it (in the depth of 1-10 cm). Spruce (Picea abies) seedlings were not abundant (averaged 300 ± 101 trees per ha) in these sites. The higher density of spruce seedlings was found (more than 300 trees per ha) in drained cutovers (h5 = 10-80 cm) on mesotrophic peatlands. It was found that the average density of seedlings of trees in cutovers on fens (eutrophic peatlands) depended significantly on the depth of the ground water table, coverage of ground vegetation and acidity of soils.It was concluded that overly intensive drainage of fens (lowering ground water table at the beginning of the growth period of trees by more than 30-40 cm) created unfavourable conditions for regeneration of trees, decreased the base saturation of soil, increased soil acidity and reduced soil fertility.
    WOS© Citations 1  47