Mechanical resistance of Quercus robur L. at the environmental boundary of the species distribution in the steppe

Abstract The paper studies the mechanical resistance of old-age pedunculate oak trees which grow at the environmental boundary of the species distribution in the steppe. The trees of the studied species growing in the south of the East European Plain (Donetsk Ridge) can be about 200 years old and still be viable (good condition) and have a high mechanical resistance (critical mass (mcr)=105 kg, and flexural stiffness=9.8·107 N·m2) even under unfavourable environmental conditions. A strong dependence of the morphometric parameter of the ratio was established between the tree trunk diameter and its height on the parameters of the trunk bending stiffness, its critical mass, and the relative resistance to bending. The obtained results of statistical analysis can be used to monitor oak forests and scattered trees of Quercus robur L. in order to single out plants with low mechanical resistance with the help of the d/l parameter which serves as a morphometric marker of the tree resistance.

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Genetic differentiation of Quercus robur in the South-Ural

Silvae Genetica ◽

10.2478/sg-2019-0019 ◽

2019 ◽

Vol 68 (1) ◽

pp. 111-115 ◽

Cited By ~ 2

Author(s):

Bernd Degen ◽

Ruslan Yanbaev ◽

Yulai Yanbaev

Keyword(s):

Genetic Differentiation ◽

Species Distribution ◽

Quercus Robur ◽

Distribution Area ◽

Pedunculate Oak ◽

The South ◽

Ural Mountains ◽

Genetic Groups ◽

Oak Trees ◽

Nuclear Microsatellite

Abstract We studied the genetic composition of 200 pedunculate oak (Quercus robur) trees at nine nuclear microsatellite gene loci. We sampled nine locations in an area of 1100 km by 400 km in the South-Ural. The question was to analyse the genetic differentiation of the oaks at the south-east edge of the species distribution area. We observed relatively high values of genetic differentiation and fixation (delta=0.387, FST=0.0652, FST(Hedrick)=0.407) compared to values from the centre of the species distribution range. Bayesian clustering analysis revealed three genetic groups. Presence of all genetic groups was detected at all locations, but oak trees in the extreme east of the Ural Mountains were genetically most different. We hypothesise that genetic drift influenced the observed pattern.

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Growth and management of mixed Pinus sylvestris - Quercus robur stands in Flanders, Belgium

Silva Gandavensis ◽

10.21825/sg.v58i0.880 ◽

1993 ◽

Vol 58 ◽

Cited By ~ 1

Author(s):

D. Maddelein ◽

J. Neirynck ◽

G. Sioen

Keyword(s):

Pinus Sylvestris ◽

Natural Regeneration ◽

Quercus Robur ◽

Good Growth ◽

Pedunculate Oak ◽

Selection System ◽

Management Options ◽

Stand Management ◽

Pine Stands

Mature Scots pine (Pinus sylvestris L.) stands are dominating large parts of the Flemish forest area. Broadleaved species regenerate spontaneously under this pine canopy. This study studied the growth and development of two planted pine stands with an older natural regeneration, dominated by pedunculate oak (Quercus robur L.), and discussed management options for similar stands. The results indicated a rather good growth of the stands, with current annual increments of 5 m3.ha-1.yr-1. The pine overstorey is growing into valuable sawwood dimensions, while the broadleaved understorey slowly grows into the upperstorey. The quality of the regeneration is moderate but can be improved by silvicultural measurements (pruning, early selection). In both stands, an interesting (timber production, nature conservation) admixture of secondary tree species is present in the regeneration. Stand management is evolving from the classical clearcut system towards a combination of a type of selection and group selection system.

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Chloroplast DNA Variation and Phylogeography of Pedunculate Oak Quercus robur L. in the Eastern Part of the Range

Russian Journal of Genetics ◽

10.1134/s1022795421010130 ◽

2021 ◽

Vol 57 (1) ◽

pp. 47-60

Author(s):

S. A. Semerikova ◽

I. Yu. Isakov ◽

V. L. Semerikov

Keyword(s):

Chloroplast Dna ◽

Quercus Robur ◽

Pedunculate Oak ◽

Dna Variation ◽

Chloroplast Dna Variation

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Population genetic structure of pedunculate oak (Quercus robur L.) in Belarus according to the analysis of chloroplast DNA

Journal of the Belarusian State University Biology ◽

10.33581/2521-1722-2021-3-59-70 ◽

2021 ◽

pp. 59-70

Author(s):

Vladimir E. Padutov

Keyword(s):

Genetic Structure ◽

Chloroplast Dna ◽

Population Genetic Structure ◽

Population Genetic ◽

Quercus Robur ◽

Phylogenetic Trees ◽

Rflp Analysis ◽

Pedunculate Oak ◽

Maximum Likelihood Methods ◽

The Republic

Pedunculate oak (Quercus robur L.) is one of the main forest forming species in the Republic of Belarus. Its population genetic structure was formed under the influence of various migration processes. Six chloroplast DNA loci (µdt1, µdt3, µdt4, µcd4, µcd5 and µkk4) were used for the genogeographic study. The material for the analysis was collected in 100 oak forest stands (2325 samples); 18 allelic variants were identified, which are grouped into 17 different combinations (haplotypes). Five of them are widespread (the proportion of occurrence varies from 7 to 48 %, totalling 85 %). The remaining 12 are rare (the proportion of occurrence varies from 1 to 3 %, totalling 15 %). Phylogenetic trees constructed using the nearest neighbour and maximum likelihood methods show the presence of two groups (branches) of haplotypes. One of it comprises 8 variants including 2 dominant haplotypes and the other comprises 9 variants including 3 dominant haplotypes. PCR-RFLP analysis of chloroplast DNA showed that the pedunculate oak in Belarus originates from the Balkan refugium. Haplotype No. 1 (µdt189, µdt3123, µdt4142, µcd494, µcd574, µkk4109) is found almost everywhere in Belarus with the exception of the southwest and northeast, while haplotype No. 8 (µdt189, µdt3121, µdt4142, µcd494, µcd574, µkk4109) is mainly localised in the southwest and northeast. Haplotypes No. 3 (µdt189, µdt3120, µdt4141, µcd494, µcd575, µkk4109) and No. 7 (µdt189, µdt3122, µdt4142, µcd494, µcd574, µkk4109) predominantly found in the west of the country. Haplotype No. 2 (µdt190, µdt3120, µdt4141, µcd495, µcd574, µkk4109) is typical for the southeast.

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Appreciation of tolerance at the impact of thermal stress on photosystem ii activity in the leaves of pedunculate oak (Quercus robur L.) trees of different ecological origin

Journal of Botany ◽

10.52240/1857-2367.2021.1(22).04 ◽

2021 ◽

Vol 13 (1(22)) ◽

pp. 13-20

Author(s):

Petru Cuza ◽

Keyword(s):

Thermal Stress ◽

Photosystem Ii ◽

Quercus Robur ◽

Central Area ◽

Extreme Weather Events ◽

Pedunculate Oak ◽

Adaptation Capacity ◽

Oak Trees ◽

Photosystem Ii Activity ◽

The Impact

Extreme weather events with high temperatures and strong sunlight have increased alarmingly in the last few decades, considerable affecting plant photosynthesis. In this study, the impact of thermal stress on photosystem II activity in the leaves of pedunculate oak trees (Quercus robur L.) of different ecological origin was assessed. Four days after the thermal shock application with a temperature of 50°C during 20, 40, 60 minutes, the processes of recovery on photosystem II activity in the leaves of the oak trees in the investigated provenances took place with different speed and fullness. The recovery of the functional state of photosystem II in the leaves of the trees showed that in the environmental conditions of the ,,Plaiul Fagului” reservation territory an advanced thermotolerance to the thermal stress action was specifi c for the origin from the north of the country (Edinet). The leaves of the trees of local and southern origin showed a low resistance to the thermal stress action. The advanced adaptation capacity, the high growth rate of the trees from the northern provenance suggest that the acorn harvested from the oaks of northern origin can be used for the works of extension of the afforestation areas in the central area of the Republic of Moldova.

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Acorn size influence on the quality of pedunculate oak (Quercus robur L.) one-year old seedlings

REFORESTA ◽

10.21750/refor.8.02.72 ◽

2019 ◽

Author(s):

Jovana Devetaković ◽

◽

Marina Nonić ◽

Bojan Prokić ◽

Vladan Popović ◽

...

Keyword(s):

Quercus Robur ◽

Pedunculate Oak ◽

Acorn Size ◽

One Year

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Oak Species Quercus robur L. and Quercus petraea Liebl. Identification Based on UHPLC-HRMS/MS Molecular Networks

Metabolites ◽

10.3390/metabo11100684 ◽

2021 ◽

Vol 11 (10) ◽

pp. 684

Author(s):

Gaëlle Buche ◽

Cyril Colas ◽

Laëtitia Fougère ◽

Emilie Destandau

Keyword(s):

Quercus Robur ◽

Quercus Petraea ◽

Molecular Network ◽

Molecular Networks ◽

Venn Diagram ◽

Pedunculate Oak ◽

Pure Species ◽

Wide Range ◽

Fragmentation Patterns ◽

The Individual

Two species of oak are dominant in French forests: pedunculate oak (Quercus robur L.) and sessile oak (Quercus petraea Liebl.). Their differentiation is not straightforward but is essential to better understand their respective molecular content in order to better valorize them. Thus, to improve oak species identification, an untargeted UHPLC-HRMS/MS method associated with a two-step data treatment was developed to analyze a wide range of specialized metabolites enabling the comparison of both species of oak extracts. Pooled extracts from sessile and pedunculate oaks, composed of extracts from several trees of pure species from various origins, were compared using first the Venn diagram, as a quick way to get an initial idea of how close the extracts are, and then using a molecular network to visualize, on the one hand, the ions shared between the two species and, on the other hand, the compounds specific to one species. The molecular network showed that the two species shared common clusters mainly representative of tannins derivatives and that each species has specific molecules with similar fragmentation patterns, associated in specific clusters. This methodology was then applied to compare these two pooled extracts to unknown individuals in order to determine the species. The Venn diagram allowed for the quick presumption of the species of the individual and then the species could be assigned more precisely with the molecular network, at the level of specific clusters. This method, developed for the first time, has several interests. First, it makes it possible to discriminate the species and to correctly assign the species of unknown samples. Moreover, it gave an overview of the metabolite composition of each sample to better target oak tree utilization and valorization.

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