scholarly journals Variability of acorn nutrient concentrations in pedunculate oak (Quercus roburL.) genotypes

2012 ◽  
Vol 52 (No. 2) ◽  
pp. 51-60 ◽  
Author(s):  
N. Nikolić ◽  
S. Orlović ◽  
B. Krstić ◽  
Ž. Kevrešan
Keyword(s):  
Chemical Composition ◽  
Seed Coat ◽  
Quercus Robur ◽  
Potassium Concentration ◽  
Nutrient Concentrations ◽  
Pedunculate Oak ◽  
Mineral Element ◽  
General Sequence ◽  
Lower Variability ◽  
Nutrient Amounts

The objective of this study was to determine mineral element concentrations (N, P, K, Ca, Mg, Na, Fe, Zn, Mn, and Cu) in various parts of pedunculate oak acorns to estimate variability in the chemical composition of different genotypes. Acorns were collected during the 1998 harvest from seventeen Quercus robur L. genotypes. Trees originated from a vegetative seed plantation Banov Brod, belonging to the Forest Estate Sremska Mitrovica (Srem, Vojvodina, Serbia). The investigation of the nutritional status of acorns revealed significant differences between the studied genotypes. Considering all genotypes, the general sequence of nutrient amounts for the entire embryo was as follows: N > K > Ca > P > Mg > Na > Fe > Zn > Mn > Cu. Concentrations of Ca, Mg, Fe, and Mn were higher for the pericarp and seed coat than for the embryo. Pericarp and seed coat nutrient concentrations showed lower variability than in the embryo, with the exception of potassium concentration.

scholarly journals Influence of Scarification on the Germination Capacity of Acorns Harvested from Uneven-aged Stands of Pedunculate Oak (Quercus robur L.)

2018 ◽  
Author(s):  
Zdzisław Kaliniewicz ◽  
Paweł Tylek
Keyword(s):  
Seed Coat ◽  
Quercus Robur ◽  
Pedunculate Oak ◽  
Germination Capacity ◽  
Partial Removal ◽  
Before And After ◽  
Size Groups ◽  
Speed Up ◽  
Container Nurseries ◽  
Average Size

Scarification involves the partial removal of the seed coat on the side of the hilum, opposite the radicle, to speed up germination in acorns. The aim of this study was to determine the influence of scarification on the germination capacity of pedunculate oak acorns, selected and prepared for sowing. The diameter, length and mass of acorns were measured before and after scarification in four batches of acorns harvested from uneven-aged trees (76, 91, 131 and 161 years). The measured parameters were used to determine the correlations between acorn dimensions and mass, and to calculate the dimensional scarification index and the mass scarification index in acorns. Scarified and non-scarified acorns from every batch were germinated on sand and peat substrate for 28 days. The analyzed acorns were characterized by average size and mass. Scarification decreased acorn mass by around 22% and acorn length by around 31% on average. Scarification and the elimination of infected acorns increased germination capacity from around 64% to around 81% on average. Acorns can be divided into size groups before scarification to obtain seed material with varied germination capacity. Larger acorns with higher germination capacity can be used for sowing in container nurseries, whereas smaller acorns with lower germination capacity can be sown in open-field nurseries.

scholarly journals Surveying Changes in Sectional Tissue Nutrient Concentrations of Hibiscus acetosella ‘Panama Red’ during Adventitious Root Formation

HortScience ◽  
2016 ◽  
Vol 51 (11) ◽  
pp. 1407-1411
Author(s):  
Michael T. Martin ◽  
Geoffrey M. Weaver ◽  
Matthew R. Chappell ◽  
Jerry Davis
Keyword(s):  
Root Formation ◽  
Potassium Concentration ◽  
Adventitious Rooting ◽  
Mineral Elements ◽  
Adventitious Root Formation ◽  
Nutrient Concentrations ◽  
Stem Cuttings ◽  
Fine Scale ◽  
Mineral Element ◽  
Propagation Period

A study was conducted to observe changes in mineral element concentrations within different sections of leafy stem cuttings of Hibiscus acetosella ‘Panama Red’ (PP20121) during a 21-day propagation period under standard industry propagation conditions. Concentrations of 13 mineral elements were analyzed in leaves, lower stems (below substrate), upper stems (above substrate), and roots at 3-day intervals. Before root emergence (day 0–6), P, K, Zn, Ca, and Mg concentrations decreased in the shoots (including upper stems and leaves), whereas Zn, Ca, and B concentrations decreased in the lower stems. Sulfur increase occurred in lower stems before root emergence. After rooting (day 9–21), N, P, Zn, Fe, Cu, and Ni concentrations decreased in the roots; K, S, B, and Mg concentrations increased. In the lower stems, N, P, K, S, and Zn concentrations decreased, whereas B increased. Potassium concentration decreased in the leaves; P, K, S, and Zn decreased in the upper stems. Calcium and Mg increased in leaves. This study indicates specific nutrients are important in adventitious rooting, and that it is important to analyze rooting as a function of fine-scale temporal measurements and fine-scale sectional measurements.

scholarly journals Physiological responses of Pedunculate oak (Quercus robur L.) to Corythucha arcuata (Say, 1832) attack

2019 ◽  
Vol 71 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Natasa Nikolic ◽  
Andrej Pilipovic ◽  
Milan Drekic ◽  
Danijela Kojic ◽  
Leopold Poljakovic-Pajnik ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Quercus Robur ◽  
Physiological Responses ◽  
Mineral Nutrient ◽  
Distribution Area ◽  
Nutrient Concentrations ◽  
Plant Responses ◽  
Pedunculate Oak ◽  
Lace Bug ◽  
The Impact

The spread and occurrence of the oak lace bug Corythucha arcuata out of its natural distribution area across European and Asian countries has been reported during the past decades. The ecological and economic significance of oak stands and the vulnerability of plants to various abiotic and/or biotic factors requires in-depth knowledge of plant-pest interaction. The present study examined the influence of C. arcuata feeding on the photosynthetic characteristics and gas-exchange parameters, mineral nutrient concentrations and defense mechanisms (the activities of some antioxidant enzymes) of leaves of pedunculate oak. The rate of photosynthesis, transpiration and stomatal conductance were lowered by 58.84, 21.66 and 35.71%, respectively, in comparison to non-infested plants. The concentrations of photosynthetic pigments and activities of antioxidant enzymes, catalase and ascorbate peroxidase, were affected by the presence of C. arcuata. To our knowledge this is the first paper providing a report on the physiological responses of Quercus robur plants exposed to C. arcuata infestation. Understanding the impact of pests, such as the invasive species C. arcuata on physiological processes and vitality of young plants and plant responses, could provide a foundation for efficient preservation of oak forests endangered by the oak lace bug.

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

1993 ◽  
Vol 58 ◽  
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.

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

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.

scholarly journals 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

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.

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

REFORESTA ◽  
2019 ◽  
Author(s):  
Jovana Devetaković ◽  
◽  
Marina Nonić ◽  
Bojan Prokić ◽  
Vladan Popović ◽  
...  
Keyword(s):  
Quercus Robur ◽  
Pedunculate Oak ◽  
Acorn Size ◽  
One Year

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

Metabolites ◽  
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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