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Auteur : Grafiati
Publié le 10 mars 2023

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1

La Marca, O., et G. Notarangelo. « Influence of thinnings on wood production in a Turkey oak (Quercus cerrisL.) in southern Italy ». Forest@ - Rivista di Selvicoltura ed Ecologia Forestale 6, no 1 (19 mai 2009) : 173–85. http://dx.doi.org/10.3832/efor0581-006.

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2

Yang, Jia, Yu-Fan Guo, Xiao-Dan Chen, Xiao Zhang, Miao-Miao Ju, Guo-Qing Bai, Zhan-Lin Liu et Gui-Fang Zhao. « Framework Phylogeny, Evolution and Complex Diversification of Chinese Oaks ». Plants 9, no 8 (13 août 2020) : 1024. http://dx.doi.org/10.3390/plants9081024.

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Oaks (Quercus L.) are ideal models to assess patterns of plant diversity. We integrated the sequence data of five chloroplast and two nuclear loci from 50 Chinese oaks to explore the phylogenetic framework, evolution and diversification patterns of the Chinese oak’s lineage. The framework phylogeny strongly supports two subgenera Quercus and Cerris comprising four infrageneric sections Quercus, Cerris, Ilex and Cyclobalanopsis for the Chinese oaks. An evolutionary analysis suggests that the two subgenera probably split during the mid-Eocene, followed by intergroup divergence within the subgenus Cerris around the late Eocene. The initial diversification of sections in the subgenus Cerris was dated between the mid-Oligocene and the Oligocene–Miocene boundary, while a rapid species radiation in section Quercus started in the late Miocene. Diversification simulations indicate a potential evolutionary shift on section Quercus, while several phenotypic shifts likely occur among all sections. We found significant negative correlations between rates of the lineage diversification and phenotypic turnover, suggesting a complex interaction between the species evolution and morphological divergence in Chinese oaks. Our infrageneric phylogeny of Chinese oaks accords with the recently proposed classification of the genus Quercus. The results point to tectonic activity and climatic change during the Tertiary as possible drivers of evolution and diversification in the Chinese oak’s lineage.
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RODRÍGUEZ, WILLIAM DAVID, JOSÉ LUIS NAVARRETE-HEREDIA et JAN KLIMASZEWSKI. « Rove beetles collected with carrion traps (Coleoptera : Staphylinidae) in Quercus forest of Cerro de García, Jalisco and Quercus, Quercus-pine, and pine forests in other jurisdictions of Mexico ». Zootaxa 4433, no 3 (13 juin 2018) : 457. http://dx.doi.org/10.11646/zootaxa.4433.3.4.

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We present the species diversity of rove beetles (Coleoptera: Staphylinidae) collected with carrion baited traps in Quercus forests of Cerro de García, Jalisco, and provide a compilation of published species records in Quercus, Quercus-pine and pine forests in other jurisdictions of Mexico. This work includes taxonomic notes, information on species phenology, distribution, and their occurrence in Cerro de García (if applicable), and other jurisdictions of Mexico. In Cerro de García, 75 species were collected in total, of which 16 are shared with other Quercus forests in different locations, and 9 species are provided with new habitat data. The remaining individuals were only determined to morphospecies. In Mexico, there are 77 known species of rove beetles collected with carrion traps (determined to species or near species) and recorded from Quercus, Quercus-pine and pine forests. These species belong to 30 genera, 11 tribes and 10 subfamilies. This study provides biological information on Mexican rove beetles captured with carrion traps and highlights the importance of rove beetles as indicator species of habitat change for conservation analysis, forestry, agronomy and forensic sciences studies.
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MELIKA, GEORGE, JULI PUJADE-VILLAR, YOSHIHISA ABE, CHANG-TI TANG, JAMES NICHOLLS, NAKATADA WACHI, TATSUYA IDE et al. « Palaearctic oak gallwasps galling oaks (Quercus) in the section Cerris : re-appraisal of generic limits, with descriptions of new genera and species (Hymenoptera : Cynipidae : Cynipini) ». Zootaxa 2470, no 1 (14 mai 2010) : 1. http://dx.doi.org/10.11646/zootaxa.2470.1.1.

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We discuss the taxonomy of oak gallwasps (Hymenoptera: Cynipidae: Cynipini) whose lifecycle involves only Palaearctic oaks (Quercus subgen. Quercus) in the section Cerris. Recent phylogenetic reconstructions support a deep split between such Cerris-associated species in the genera Aphelonyx, Dryocosmus, Plagiotrochus, Neuroterus, Pseudoneuroterus and species and genera associated with oaks in the section Quercus sensu stricto. We reappraise the generic limits of the Cerris-associated genera, proposing new limits for Dryocosmus, Pseudoneuroterus and Neuroterus, establishing a new genus Cerroneuroterus, elevating Latuspina to a genus level, reestablishing the genera Chilaspis and Trichagalma and proposed new species name combinations. We provide a new key to oak gallwasp genera of the Palaearctic and keys to all species of genera associated with Cerris section oaks. We describe five new species, Aphelonyx kordestanica, Trichagalma formosana, Dryocosmus jungalii, Pseudoneuroterus mazandarani, and P. nichollsi.
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Petrovic, S., S. Sobajic, S. Rakic, A. Tomic et J. Kukic. « Investigation of kernel oils of Quercus robur and Quercus cerris ». Chemistry of Natural Compounds 40, no 5 (septembre 2004) : 420–22. http://dx.doi.org/10.1007/s10600-005-0003-4.

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6

Jan, Kabíček. « Phytoseiid mites on Quercus cerris in an urban park – short communication ». Plant Protection Science 53, No. 3 (28 mai 2017) : 181–86. http://dx.doi.org/10.17221/167/2016-pps.

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The community of phytoseiid mites on the leaves of non-indigenous Quercus cerris was studied in an intensively managed urban park during the years 2012–2014. Five phytoseiid species, namely Kampimodromus aberrans, Typhloseiulus peculiaris, Euseius finlandicus, Typhlodromus (Typhlodromus) pyri, and Paraseiulus triporus, were found on the studied oak leaves; three of them are generalist predators. K. aberrans and T. peculiaris were the dominant species (88.5% of all sampled phytoseiids), of which K. aberrans was the significantly most abundant species on the inspected oak leaves. Non-native Q. cerris can serve as a favourable host plant and refuge for certain phytoseiid species in environmentally unfriendly urban areas.
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Pinto, Diana, Santiago Diaz Franco, Ana Margarida Silva, Snezana Cupara, Marijana Koskovac, Ksenija Kojicic, Sónia Soares et al. « Chemical characterization and bioactive properties of a coffee-like beverage prepared from Quercus cerris kernels ». Food & ; Function 10, no 4 (2019) : 2050–60. http://dx.doi.org/10.1039/c8fo02536c.

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Najib, Rola, Tarek Houri, Yara Khairallah et Mahmoud Khalil. « Quercus cerris L. : An Overview ». Forestry Studies 74, no 1 (1 décembre 2021) : 1–9. http://dx.doi.org/10.2478/fsmu-2021-0001.

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Abstract The Turkey oak is a frequent tree species in the Mediterranean climate zones of southern Europe and Asia Minor. It has been used in the human diet, for medicinal purposes, firewood and charcoal production. Like all oaks, Turkey oak is suffering from dieback and decline owing to the combination of several detrimental factors, such as insects, diseases and unfavorable environment, leading to their deterioration and sometimes resulting in their early death.
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Bariska, Mihály, Zoltán Pásztory et Zoltán Börcsök. « On tylosis ultrastructure in Quercus cerris L. » Holzforschung 73, no 12 (26 novembre 2019) : 1121–23. http://dx.doi.org/10.1515/hf-2019-0028.

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Abstract A study of tylosis in European Turkey oak (Quercus cerris L.) shows correspondences in the formation of tyloses and of regular cell walls. The outer tylosis wall has a smooth, granular surface with simple perforations analogous to that of the primary wall of ordinary cells. The underlying wall stratum shows parallel oriented macro-fibrils, normally found in the secondary walls of regular cells. At the contact areas of tyloses, stabilizing seams can be observed. Various types of wall openings such as simple pits, blind pits and vestured pits were present. Also tylosis division was detected. The characteristics of parenchyma cell walls can be re-discovered in tyloses.
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10

Milanovic, Slobodan. « Development of gypsy moth (Lymantria dispar L) on the foliage of Quercus cerris L., Q. Petraea (matt) Liebl. and Q. Robur L. in the controlled conditions ». Bulletin of the Faculty of Forestry, no 96 (2007) : 55–67. http://dx.doi.org/10.2298/gsf0796055m.

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The development of Gypsy moth (Lymantria dispar L) was monitored in laboratory conditions, on the foliage of the species Quercus cerris L. Quercus petraea (Matt) Liebl. and Quercus robur L. The experiment was established in the controlled environmental conditions, at the temperature of 25?C, photoperiod 14:10 (day: night) and relative humidity 70%. The objective of the research was to determine the suitability of the study host plant species for gypsy moth development. The study results show that Gypsy moth caterpillars cultivated on Q. petraea foliage had a lower survival, higher number of moultings, longer preadult development and lower fecundity, which makes this species less suitable compared to the other two. Gypsy moth caterpillars cultivated on Q. cerris foliage had the highest survival degree the lowest number of moultings, the shortest preadult development and the highest fecundity, which makes this species the most favourable for gypsy moth development. Q. robur was between the former two species in this respect.
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DEMİREL, MUSTAFA, MUSA AZMAZ et YUSUF KATILMIŞ. « A new species of oak gall wasp (Hymenoptera : Cynipidae, Cynipini) from Turkey ». Zootaxa 5087, no 4 (10 janvier 2022) : 583–90. http://dx.doi.org/10.11646/zootaxa.5087.4.6.

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A new species of the genus Andricus Hartig, 1840 (Cynipidae: Cynipini) is described from Burdur province in Turkey: Andricus arslani Azmaz & Katılmış sp. n. sexual generation. The new species induce galls on Quercus cerris L. belonging to section Cerris. SEM images, photos of the host galls, and data on the diagnosis, distribution, and biology of the new species are provided.
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Kebert, Marko, Vanja Vuksanović, Jacqueline Stefels, Mirjana Bojović, Rita Horák, Saša Kostić, Branislav Kovačević et al. « Species-Level Differences in Osmoprotectants and Antioxidants Contribute to Stress Tolerance of Quercus robur L., and Q. cerris L. Seedlings under Water Deficit and High Temperatures ». Plants 11, no 13 (30 juin 2022) : 1744. http://dx.doi.org/10.3390/plants11131744.

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The general aim of this work was to compare the leaf-level responses of different protective components to water deficit and high temperatures in Quercus cerris L. and Quercus robur L. Several biochemical components of the osmotic adjustment and antioxidant system were investigated together with changes in hormones. Q. cerris and Q. robur seedlings responded to water deficit and high temperatures by: (1) activating a different pattern of osmoregulation and antioxidant mechanisms depending on the species and on the nature of the stress; (2) upregulating the synthesis of a newly-explored osmoprotectant, dimethylsulphoniopropionate (DMSP); (3) trading-off between metabolites; and (4) modulating hormone levels. Under water deficit, Q. cerris had a higher antioxidant capacity compared to Q. robur, which showed a lower investment in the antioxidant system. In both species, exposure to high temperatures induced a strong osmoregulation capacity that appeared largely conferred by DMSP in Q. cerris and by glycine betaine in Q. robur. Collectively, the more stress-responsive compounds in each species were those present at a significant basal level in non-stress conditions. Our results were discussed in terms of pre-adaptation and stress-induced metabolic patterns as related to species-specific stress tolerance features.
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13

Hobby, Gerren H., Cassandra L. Quave, Katie Nelson, Cesar M. Compadre, Karen E. Beenken et Mark S. Smeltzer. « Quercus cerris extracts limit Staphylococcus aureus biofilm formation ». Journal of Ethnopharmacology 144, no 3 (décembre 2012) : 812–15. http://dx.doi.org/10.1016/j.jep.2012.10.042.

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14

Kehl, Alexandra, et Andreas König. « Stiel-Eichen und Knopperngallwespe ». Der Palmengarten 78, no 2 (30 décembre 2014) : 85–87. http://dx.doi.org/10.21248/palmengarten.233.

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Knoppern entwickeln sich auf den Eicheln von Stiel-Eichen (Quercus robur). Sie werden durch Gallwespen (Andricus quercuscalicis) verursacht. Diese kleine Gallwespe hat einen komplizierten Lebenszyklus, der die Anwesenheit von zwei Eichenarten erfordert, nämlich der Stiel- und der Zerr-Eiche (Quercus robur, Q. cerris). Das Insekt bildet abwechselnd eine geschlechtliche und eine ungeschlechtliche, parthenogenetische Generation. Lebenszyklus der Gallwespe und die Verwendung von Knoppern werden vorgestellt.
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15

Terzi, Massimo, Giampiero Ciaschetti, Paola Fortini, Leonardo Rosati, Daniele Viciani et Romeo Di Pietro. « New syntaxon names for the Italian Quercus cerris woods ». Mediterranean Botany 42 (27 octobre 2021) : e75592. http://dx.doi.org/10.5209/mbot.75592.

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16

Jovanovic, Marija, Jelena Milovanovic, Marina Nonic et Mirjana Sijacic-Nikolic. « Inter- and intraspecific variability of Quercus cerris L. and Quercus frainneto Ten. in the Sumadija region (Serbia) based on leaf geometric morphometrics ». Genetika 54, no 2 (2022) : 787–800. http://dx.doi.org/10.2298/gensr2202787j.

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In this study, we used leaf geometric morphometrics to quantify the differences among Quercus cerris L. and Quercus frainetto Ten. and their populations in the Sumadija region in Serbia. We sampled 2200 leaves from eight populations and on each leaf recorded 13 landmarks. To analyze how leaf morphology varies across species and populations, we used Procrustes ANOVA, a two-block partial least-squares analysis, a principal component analysis and a canonical variate analysis. The results showed a clear discrimination between species, followed by different levels of leaf shape variability in Q. cerris and Q. frainetto. The leaves of Q. cerris displayed higher levels of variability and higher differences among populations compared to Q. frainetto. The patterns of population grouping in the two species greatly differed, indicating that in these species different factors contribute to intraspecific variability. This study provides preliminary results of the leaf morphometric variability of oak species in the Sumadija region in Serbia. Future studies should include genetic and environmental analyses to understand the origins of phenotypic differences between species and populations, and to fully recognize which factors mostly determine relationships between taxa.
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Bakis, Y., et MT Babaç. « Morphological variability of acorns and its taxonomic significance in Quercus. from Turkey ». Bangladesh Journal of Botany 43, no 3 (14 janvier 2015) : 293–99. http://dx.doi.org/10.3329/bjb.v43i3.21601.

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Morphological variations of acorn among and within the groups of Quercus species were studied. A total of 617 acorns belonging to 14 species representing all 3 sections of Quercus L. (Fagaceae) in Turkey were examined in this study. Specimens were collected from 47 different populations over both Anatolian and Thrace part of Turkey. Principal component analysis was used to analyze the morphological characteristics of acorns. Results obtained from this study demonstrate the use of morphological characters in differentiating the taxa of Quercus and Cerris sections studied. Another important finding is the introgression among the acorns of species within Quercus section DOI: http://dx.doi.org/10.3329/bjb.v43i3.21601 Bangladesh J. Bot. 43(3): 293-299, 2014 (December)
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MUTUN, SERAP, SERDAR DINÇ et GEORGE MELIKA. « Two new species of oak gall wasps from Turkey (Hymenoptera : Cynipidae, Cynipini) ». Zootaxa 4890, no 3 (3 décembre 2020) : 428–38. http://dx.doi.org/10.11646/zootaxa.4890.3.9.

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Two new species of oak gall wasps, Cynips izzetbaysali sp. nov. and Callirhytis afion sp. nov. (Hymenoptera: Cynipidae: Cynipini) are described from Turkey. The new Cynips species is known only from asexual females and induces detachable leaf galls on Quercus infectoria. The sexual generation of the new Callirhytis species is known to induce acorn galls on Quercus cerris. Data on the diagnosis, distribution, and biology of the two new species are given.
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Struve, Daniel, Francesco Ferrini, Alessio Fini et Laura Pennati. « Relative Growth and Water Use of Seedlings from Three Italian Quercus Species ». Arboriculture & ; Urban Forestry 35, no 3 (1 mai 2009) : 113–21. http://dx.doi.org/10.48044/jauf.2009.021.

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A species’ water use characteristics and growth habits are important to urban foresters. Seedlings from three species (and two sources)—Quercus cerris L., Q. pubescens Willd., and Q. robur L.—were container-grown and subjected to a three day water use trial under nonlimiting soil moisture conditions. Water use varied among species and between sources within a species. Larger seedlings used more water than smaller seedlings; Q. robur seedlings were the tallest, 70.5 cm (27.8 in), and had the greatest water use seedling, 73.4 g (2.5 oz) water, while Q. pubescens and Q. cerris seedlings were shorter, 46 and 45 cm (18.1 and 17.7 in), and averaged 47.5 and 44.9 g (1.68 and 1.58 oz) water, respectively. Quercus pubescens seedlings had the highest water use cm-2 leaf area (0.111 g); Q. cerris seedlings had the highest height-adjusted water use (1.4 g water cm-1 height). There were significant differences in water use between sources within species. Principal component analysis, using 20 variables, showed that seedlings of Q. robur and Q. pubescens sources clustered while seedlings of the two Q. cerris sources were separate from each other and the Q. robur and Q. pubescens sources. The clustering reflected the proportionally greater distribution of dry weight to shoot growth and correspondingly less to root growth of the Q. robur and Q. pubescens seedlings, than that for Q. cerris seedlings. The results are related to the species’ relative value to nursery producers and to the potential value to urban forest managers and the potential for cultivar development.
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Nisca, Adrian, Ruxandra Ștefănescu, Cadmiel Moldovan, Andrei Mocan, Anca Delia Mare, Cristina Nicoleta Ciurea, Adrian Man, Daniela-Lucia Muntean et Corneliu Tanase. « Optimization of Microwave Assisted Extraction Conditions to Improve Phenolic Content and In Vitro Antioxidant and Anti-Microbial Activity in Quercus cerris Bark Extracts ». Plants 11, no 3 (18 janvier 2022) : 240. http://dx.doi.org/10.3390/plants11030240.

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The species of the Quercus genus, including Quercus cerris L., are widely used and their wood represents a valuable material utilized for various purposes. The intense industrial processing of wood results in a considerable amount of poorly-used natural by-products, such as bark, and a loss of potentially useful raw materials. Thus, the aim of our study was to evaluate the phytochemical characteristics and potential biological activities of Quercus cerris bark extracts obtained by optimizing the parameters of microwave assisted extraction (MAE). The optimum conditions for MAE were determined using a design of experiments (DoE) model, which set the experimental variables (irradiation time and microwave power) and their values. Aqueous and hydroalcoholic extractions were performed and the optimum parameters of extraction were determined for both solvents. The total polyphenolic and tannin contents were determined. The biological activities representative of antioxidant capacity were determined using two free radical scavenging methods, the DPPH and ABTS methods, and the antibacterial activity was assessed with the microdilution method. The results showed different optimal extraction conditions for aqueous (30 min at 850 W) and hydroalcoholic (18 min at 650 W) extracts. A higher yield of total polyphenols was observed in the hydroalcoholic bark extract (403.73 ± 7.35 mg gallic acid equivalents/g dried weight); however a lower level of tannins was registered in comparison to the aqueous extract. In addition, both extracts exerted high antioxidant activities, with the aqueous extracts having a stronger inhibitory effect against the DPPH radical. Moreover, the extracts exhibited antibacterial activity against the tested bacterial strains, especially against the Gram-positive strains and Klebsiella pneumoniae, with the hydroalcoholic extracts being more efficient overall. To conclude, the optimized MAE was an efficient method to extract phytochemical compounds with potential biological effects from Quercus cerris bark.
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Ragazzi, A., S. Moricca, S. Vagniluca, C. Comparini et I. Dellavalle. « Leaf Water Potential and Peroxidase activity in Quercus cerris and Quercus pubescens after Inoculation with Diplodia mutila. Blattwasserpotential und Peroxidaseaktivität in Quercus cerris und Quercus pubescens nach einer Inokulation mit Diplodia mutila ». Journal of Phytopathology 147, no 1 (janvier 1999) : 55–59. http://dx.doi.org/10.1111/j.1439-0434.1999.tb03807.x.

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Medwecka-Kornaś, Anna, Rade Drenkovski, Ljupco Grupce et Mili Mulev. « The oak forest Quercetum f rainetto-cerris on the foothills of the mountain range Galičica (Macedonia) ». Acta Societatis Botanicorum Poloniae 55, no 3 (2014) : 325–42. http://dx.doi.org/10.5586/asbp.1986.031.

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The xerothermic oak forests with <em>Quercus frainetto</em> and <em>Q. cerris</em> on the estern slope of Mt. Galičica in Macedonia were investigated in connection with the Yugoslavian contribution to the International Programme "MAB". Twenty field records were interpreted from the phytosociological and the phytogeographical points of view. -the forests under discussion represent the regional association <em>Quercetum frainetto-cerris</em> macedonicum Oberd. 1948 emend. Horvat 1959. which belongs to the <em>Quercion frainetto-cerris alliance</em>. The considerable share of Balkan and Submediterranean species in their composition is particularly significant.
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Pavlovic, Pavle, Olga Kostic, Snezana Jaric, Gordana Gajic, Dragana Pavlovic, Marija Pavlovic et Miroslava Mitrovic. « The effects of leaf litter chemistry and anatomical traits on the litter decomposition rate of Quercus frainetto Ten. and Quercus cerris L. in situ ». Archives of Biological Sciences 72, no 4 (2020) : 543–53. http://dx.doi.org/10.2298/abs200902048p.

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This paper presents the results of a one-year decomposition experiment on Quercus frainetto Ten. and Quercus cerris L. leaf litter in natural conditions. The decomposition rate constant was 0.831 yr?1 (Q. frainetto) and 0.458 yr?1 (Q. cerris). For the initial chemical composition of the oaks? litter, differences were not found in concentrations of lignin and fats, waxes and oil fractions, but were found for water-soluble matter, hemicellulose and cellulose. Later decomposition stages indicated that lignin and fats, waxes and oil fractions influenced differences in both oaks? litter decay rates. Anatomical analysis revealed differences between the oaks in leaf mesophyll and epidermis but not in the entire leaf and lower epidermis. Results after 12 months of the experiment revealed that 48.04% of the entire leaf, 53.30% of mesophyll, 32.93% of lignified upper and 47.67% of lower epidermis in Q. frainetto, and 28.70% of the entire leaf, 31.60% of mesophyll, 25.17% of lignified upper and 20.93% of lower epidermis in Q. cerris were decomposed. Reduction in leaf thickness mainly was caused by the reduction of mesophyll parenchyma, composed of easily degradable plant materials. Leaf tissues with the most recalcitrant plant materials were lignified upper epidermis, covered by a thick cuticle composed of fats and waxes, and xylem within the leaf veins.
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Ragazzi, A., S. Moricca, P. Capretti et I. Dellavalle. « Endophytic presence of Discula quercina on Declining Quercus cerris ». Journal of Phytopathology 147, no 7-8 (juillet 1999) : 437–40. http://dx.doi.org/10.1111/j.1439-0434.1999.tb03847.x.

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Ragazzi, A., S. Moricca, P. Capretti et I. Dellavalle. « Endophytic presence of Discula quercina on Declining Quercus cerris ». Journal of Phytopathology 147, no 7-8 (août 1999) : 437–40. http://dx.doi.org/10.1046/j.1439-0434.1999.00408.x.

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Şen, Ali, Carla Leite, Leandro Lima, Paulo Lopes et Helena Pereira. « Industrial valorization of Quercus cerris bark : Pilot scale fractionation ». Industrial Crops and Products 92 (décembre 2016) : 42–49. http://dx.doi.org/10.1016/j.indcrop.2016.07.044.

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Lyubenova, M., R. Tzonev et K. Pachedjieva. « Floristic Investigation ofQuercus Cerris and Quercus FrainettoCommunities in Bulgaria ». Biotechnology & ; Biotechnological Equipment 23, sup1 (janvier 2009) : 314–17. http://dx.doi.org/10.1080/13102818.2009.10818427.

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Aragón-Parada, Juvenal, Abisaí Josué García-Mendoza et Gabriel González-Adame. « Listado florístico y comunidades vegetales del Cerro Giubldan, San Bartolomé Quialana, Oaxaca, México ». Acta Botanica Mexicana, no 128 (5 mars 2021) : e1797. http://dx.doi.org/10.21829/abm128.2021.1797.

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Antecedentes y Objetivos: Oaxaca, con más de 9362 especies de plantas vasculares y 26 tipos de vegetación, es el estado con mayor diversidad florística en México. Sin embargo, el conocimiento florístico de grandes extensiones de su territorio aún se desconoce. El Cerro Giubldan está ubicado en el municipio San Bartolomé Quialana, distrito Tlacolula, región de los Valles Centrales, Oaxaca, México, y no posee ningún estudio referente a su flora y vegetación. Este trabajo tiene como objetivos el presentar el inventario florístico del Cerro Giubldan, identificar las familias y géneros con mayor y menor representatividad y describir las comunidades vegetales presentes y la superficie que ocupan. Métodos: De 2012 a 2015 se realizaron salidas de campo para recolectar plantas con estructuras reproductivas, las cuales fueron procesadas y posteriormente depositadas en los herbarios HUNSIJ, IBUG, IEB y MEXU. Los ejemplares fueron identificados con claves, el apoyo de especialistas y cotejados con material del herbario MEXU y la base de datos REMIB. Resultados clave: La flora vascular comprendió 100 familias, 308 géneros y 535 especies. Las familias más diversas fueron Asteraceae (81), Fabaceae (47), Orchidaceae (30), Lamiaceae (18), Asparagaceae (15) y Crassulaceae (15). Los géneros más ricos fueron Salvia (14), Quercus (9), Agave (7), Echeveria (7), Solanum (7) y Lamourouxia (6). Se registraron 167 especies endémicas de México y 43 de Oaxaca; ocho representan nuevos registros a nivel específico para el estado. Se describieron y caracterizaron cuatro comunidades vegetales: bosque de Quercus seco, bosque de Quercus húmedo, matorral xerófilo y comunidad rupícola. Conclusiones: La mayor riqueza de especies vegetales se concentró en 15 familias representadas por hierbas, arbustos y árboles. El bosque de Quercus seco registró la mayor diversidad, seguido del bosque de Quercus húmedo y el matorral xerófilo.
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Ianni, Federica, Enrico Segoloni, Francesca Blasi et Francesco Di Maria. « Low-Molecular-Weight Phenols Recovery by Eco-Friendly Extraction from Quercus Spp. Wastes : An Analytical and Biomass-Sustainability Evaluation ». Processes 8, no 4 (26 mars 2020) : 387. http://dx.doi.org/10.3390/pr8040387.

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In this work, chemical–physical protocols aimed at the implementation of eco-friendly and biomass-sustainable recovery processes of useful compounds from forestry and/or wood industry wastes were evaluated. Four species of interest in industrial and environmental fields (Quercus cerris, Quercus ilex, and Robinia pseudoacacia from Central Italy, Quercus petraea from France) were submitted to neutral extraction and analyzed by gaschromatography, with mass spectrometry identification of low-molecular-weight phenols. Moreover, Quercus petraea heartwood samples were submitted to three extraction/hydrolysis protocols in an alkaline environment, and the byproducts from the lignin degradation were identified and evaluated. The recovery of bioactive phenols from forestry wastes by applying eco-friendly extractive protocols may reveal a precious strategy for rethinking the management of such wastes, in line with the fundamentals of “circular economy”.
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Teixeira, Rita Teresa, et Helena Pereira. « Suberized Cell Walls of Cork from Cork Oak Differ from Other Species ». Microscopy and Microanalysis 16, no 5 (31 août 2010) : 569–75. http://dx.doi.org/10.1017/s1431927610093839.

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AbstractPlants have suberized cells that act as protective interfaces with the environment or between different plant tissues. A lamellar structure of alternating dark and light bands has been found upon transmission electron microscopy (TEM) observation of cork cells and considered a typical feature of the suberized secondary wall. We observed cork cells from periderms of Quercus suber, Quercus cerris, Solanum tuberosum, and Calotropis procera by TEM after uranyl acetate and lead citrate staining. A lamellated structure was observed in S. tuberosum and C. procera but not in Q. suber and Q. cerris where the suberized cell wall showed a predominantly hyaline aspect with only a dark dotted staining. Removal of suberin from Q. suber cells left a thinner secondary wall that lost the translucent aspect. We hypothesize that the species' specific chemical composition of suberin will result in different three-dimensional macromolecular development and in a different spatial location of lignin and other aromatics. A lamellated ultrastructure is therefore not a general feature of suberized cells.
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Cornejo-Tenorio, Guadalupe, Esther Sánchez-García, Mayra Flores-Tolentino, Francisco J. Santana-Michel et Guillermo Ibarra-Manríquez. « Flora y vegetación del cerro El Águila, Michoacán, México ». Botanical Sciences 91, no 2 (15 juin 2013) : 155–80. http://dx.doi.org/10.17129/botsci.411.

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Con base en trabajo de campo realizado entre 2007 y 2010 en el cerro El Águila, la montaña más alta localizada en los municipios de Lagunillas y Morelia, Michoacán, se registraron 105 familias, 343 géneros, 633 especies y 42 taxa infraespecíficos. Las familias más diversas fueron Asteraceae (153 especies), Fabaceae (53) y Poaceae (34). Los géneros con mayor riqueza de especies fueron Salvia (17), Stevia (12) y Verbesina (11). Las especies de hierbas conforman el 72.4% del total de la flora. Se describe la fisonomía y las especies más abundantes de cinco tipos de vegetación. Los bosques de Pinus-Quercus y Quercus son los tipos de vegetación con mayor número de especies (286 y 383, respectivamente). De acuerdo con la NOM-059-ECOL-2010 se consideran cinco Especies Sujetas a Protección Especial (Cedrela dugesii, Cupressus lusitanica, Dahlia scapigera, Gentiana spathacea y Laelia speciosa) y una en Peligro de Extinción (Tilia americana var. mexicana). Se enfatiza la importancia de coordinar esfuerzos hacia la conservación del cerro El Águila, cuya flora y vegetación se encuentran amenazadas por los cambios de uso de suelo.
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Gennaro, M., P. Gonthier, G. Nicolotti et G. P. Cellerino. « First Report of Tubakia dryina in Buds and Shoots of Quercus cerris and Quercus robur ». Plant Disease 85, no 12 (décembre 2001) : 1289. http://dx.doi.org/10.1094/pdis.2001.85.12.1289b.

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Tubakia dryina (Sacc.) Sutt. (teleomorph Dicarpella dryina Belisario & Barr) is a widespread leaf pathogen in northern temperate zones and is mainly associated with Quercus spp. During 2000, T. dryina was isolated from seasonal samplings of endophytic fungal communities of Turkey (Q. cerris L.) and English (Q. robur L.) oaks. Samples were taken from healthy and declining trees showing no symptoms of T. dryina in a coppice with saplings in Piedmont (northwestern Italy). Fragments of freshly opened buds (1-year-old shoots) and leaves were surface-sterilized by immersion in 75% ethanol for 1 min, in a NaClO solution (3 to 4% active ingredient) for 3 min, and in 75% ethanol for 30 s, then plated on potato dextrose agar. T. dryina was found in all sampled tissues. Its frequency in buds was higher in healthy trees than in declining trees (≈25 versus 12%; analysis of variance test P < 0.05), whereas no difference was found in shoots. T. dryina was also isolated from asymptomatic leaves, but more often from declining trees than from healthy ones (≈40 versus 10%; P < 0.05). No differences were observed when comparing the two oak species. The fungus was previously reported in buds of Q. nigra L. in North America (2), and it has also been isolated from symptomatic leaves of Q. cerris in a 5-year-old plantation (1). T. dryina was found in other studies in leaves and dead twigs of Q. robur. To our knowledge, this is the first report of T. dryina in buds and shoots of European oak species, suggesting an important role of this fungus as either an endophyte or a latent pathogen associated with oak decline. References: (1) A. Belisario. Plant Dis. 77:647, 1993. (2) Y. C. Zhang and J. T. Walker. Plant Dis. 79:568, 1995.
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Şen, Ali, Teresa Quilhó et Helena Pereira. « The cellular structure of cork from Quercus cerris var. cerris bark in a materials’ perspective ». Industrial Crops and Products 34, no 1 (juillet 2011) : 929–36. http://dx.doi.org/10.1016/j.indcrop.2011.02.015.

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Ján, Kulfan, Sarvašová Lenka, Parák Michal, Dzurenko Marek et Zach Peter. « Can late flushing trees avoid attack by moth larvae in temperate forests ? » Plant Protection Science 54, No. 4 (25 août 2018) : 272–83. http://dx.doi.org/10.17221/11/2018-pps.

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We investigated moth larvae (Lepidoptera) developing in temperate forests in Central Europe shortly after the tree budburst (the “brumata-viridana complex”). Larvae were collected in southern Slovakia in May 2015 and May 2016 from young and mature trees of late flushing Quercus cerris L. and early flushing Q. pubescens Willd. Although Q. cerris yielded fewer species (40 species) than Q. pubescens (47 species), the rarefied number of species and the Chao index suggested a similar number of species on mature trees of both oak species. Both the total number of moth larvae in assemblages and the abundance of dominant species (pests) were significantly lower on Q. cerris than Q. pubescens. The results suggest the release of Q. cerris with delayed budburst from heavy infestations by folivorous moth larvae. Knowledge obtained can be applied in silvicultural and horticultural practices aimed to protect and maintain forest, fruit, and ornamental trees.
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Zubrik, Milan, Andrej Gubka, Slavomír Rell, Andrej Kunca, Jozef Vakula, Juraj Galko, Christo Nikolov et Roman Leonotvyč. « First record of Corythucha arcuata in Slovakia – Short Communication ». Plant Protection Science 55, No. 2 (17 février 2019) : 129–33. http://dx.doi.org/10.17221/124/2018-pps.

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In June 2018, the presence of one adult specimen and one egg cluster of the North-American oak lace bug Corythucha arcuata were recorded near the village of Mužla, close to the Danube River, in southern Slovakia. They were found on leaves of Quercus cerris growing in a mixed stand. In August 2018, other specimens (nymphs and adults) were observed on Quercus robur leaves, near Čičarovce, in eastern Slovakia. This is the first record of C. arcuata in our country. The oak lace bug probably reached us while invading from Hungary, where heavy infestation is reported from several parts of the country.
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Di Iorio, A., B. Lasserre, G. S. Scippa et D. Chiatante. « Pattern of secondary thickening in a Quercus cerris root system ». Tree Physiology 27, no 3 (1 mars 2007) : 407–12. http://dx.doi.org/10.1093/treephys/27.3.407.

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CERASA, GIULIANO, SALVATORE SOTTILE, BRUNO MASSA et GABRIELLA LO VERDE. « Rediscovery of Cerroneuroterus apenninus (Trotter, 1923) (Hymenoptera : Cynipidae : Cynipini) a valid species from Italy with description and neotype designation  ». Zootaxa 4941, no 3 (9 mars 2021) : 399–414. http://dx.doi.org/10.11646/zootaxa.4941.3.5.

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Neuroterus apenninus Trotter, 1923 associated with a Cerris section oak, Quercus cerris L., was rediscovered in Italy in 2017. Alessandro Trotter (1903) described a leaf gall collected on Q. cerris from the Italian Apennines; he did not obtain the gall inductor and ascribed the galls to the genus Neuroterus, based on morphological similarity with other Neuroterus galls. We have found the same gall and obtained the gall inducer. Detailed study of morphological characters of adults revealed that the species belongs to the genus Cerroneuroterus Melika & Pujade-Villar, 2010. The asexual generation of Cerroneuroterus apenninus comb. n. is described for the first time, a neotype is designated, and a diagnosis, host associations and biological notes are given; an identification key to the Western Palaearctic Cerroneuroterus species is provided.
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Čermák, Jan, Roberto Tognetti, Nadezhda Nadezhdina et Antonio Raschi. « Stand structure and foliage distribution in Quercus pubescens and Quercus cerris forests in Tuscany (central Italy) ». Forest Ecology and Management 255, no 5-6 (avril 2008) : 1810–19. http://dx.doi.org/10.1016/j.foreco.2007.12.003.

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KUTBAY, Hamdi Güray. « The Distribution of Nutrients in The Different Strata of A Quercus Cerris L. var. cerris Forest ». Turkish Journal of Botany 21, no 2 (1 janvier 1997) : 93–98. http://dx.doi.org/10.55730/1300-008x.2584.

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CERASA, GIULIANO, GABRIELLA LO VERDE, VIRGILIO CALECA, BRUNO MASSA, JAMES A. NICHOLLS et GEORGE MELIKA. « Description of Dryocosmus destefanii new species (Hymenoptera : Cynipidae : Cynipini) from Quercus suber L. in Italy ». Zootaxa 4370, no 5 (15 janvier 2018) : 535. http://dx.doi.org/10.11646/zootaxa.4370.5.5.

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A new species, Dryocosmus destefanii Cerasa & Melika n. sp. associated with a Cerris section oak, Quercus suber L., is described from Italy. Description, diagnosis, host associations and biology for the new species and an illustrated identification key to the Western Palaearctic Dryocosmus species are given. The description is supported by morphological and molecular data.
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Temunović, Martina, Marco C. Simeone, Federico Vessella et Jozo Franjić. « Taksonomski status misterioznoga “Zelenoga hrasta” (Quercus× viridis Trinajstić) iz Hrvatske, temeljen na filogenetskoj analizi ». Šumarski list 142, no 5-6 (28 juin 2018) : 268. http://dx.doi.org/10.31298/sl.142.5-6.5.

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„Zeleni hrast“ je već dugo poznato i specifično stablo hrasta nepoznatoga podrijetla, koje raste u selu Islam Latinski blizu Zadra u Hrvatskoj, a procjenjuje se da je staro preko 200 godina (Slika 1). Svoje ime zahvaljuje činjenici što njegovo debelo kožasto zeleno lišće ostaje na stablu duboko u zimu. Zeleni hrast prema našim saznanjima po prvi puta u literaturi spominje Jedlowski (1955) te pretpostavlja kako se radi o križancu cera (Quercus cerris L.) i hrasta plutnjaka (Q. suber L.). Kasnije ga Trinajstić (1974) opisuje kao novi takson Quercus × viridis Trinajstić, hybr. nov. koji je prema njegovom mišljenju križanac cera (Q. cerris) i hrasta crnike (Q. ilex L.) (Slika 2). Nakon toga ovaj hrast bio je predmet mnogih istraživanja, kako taksonomskih, tako i ekoloških, botaničkih, anatomskih i morfoloških. Posljednji pregledni članak o zelenom hrastu (Müller i sur., 2003) zaključuje kako rezultati većine dosadašnjih istraživanja podupiru mišljenje koje je dao Jedlowski, a ne opis taksona od Trinajstića. Međutim, do danas taksonomski status zelenoga hrasta i njegovo podrijetlo ostaju neizvjesni. Stoga je u ovome radu po prvi puta provedena analiza filogenetskih odnosa zelenoga hrasta na temelju molekularnih biljega u odnosu na ostale blisko srodne vrste hrasta koje rastu u njegovoj široj regiji, uključujući sve potencijalne roditeljske vrste (Q. cerris, Q. ilex, Q. suber i Q. coccifera L.) kao i takson Q. crenata Lam. koji je poznat kao stabilni križanac vrsta Q. cerris i Q. suber u Italiji. Također su u analizu uključeni predstavnici skupine Quercus (Q. robur L., Q. petraea /Matt./ Liebl. i Q. pubescens Willd.) kao vanjske grupe. Ukupno naš set podataka uključivao je devet taksona i 16 jedinki roda Quercus L. (Tablica 1). Kako bismo konačno utvrdili taksonomski status zelenoga hrasta koristili smo kloroplastne (trnK-matK i trnH-psbA) i jezgrine (5.8S + ITS2) DNK biljege (tzv. DNK barkod regije) na temelju kojih smo rekonstruirali srodstvene odnose pomoću mreže haplotipova/ribotipova (Slika 3) te pomoću filogenetskoga stabla dobivenoga metodom maksimalne štedljivosti (Slika 4 i 5). Rezultati filogenetskih odnosa između zelenoga hrasta i ostalih zastupljenih taksona u ovome istraživanju (Slika 3, 4 i 5) ne podržavaju teoriju da je Q. ilex jedna od njegovih roditeljskih vrsta. Umjesto toga, molekularna filogenija nedvojbeno dokazuje kako je zeleni hrast zapravo takson poznat pod prihvaćenim nazivom Q. crenata, te potvrđuje alternativnu hipotezu kako se radi o križancu između vrsta Q. cerris i Q. suber. Pojedini autori u starijoj literaturi već su navodili svojtu Q. crenata na temelju morfoloških karakteristika za područje Istre i Kvarnera te Dalmacije, koristeći se uglavnom sinonimom Q. pseudosuber Santi (Strobl, 1872; Freyn, 1877; Richter, 1897; Schneider, 1906; Ascherson i Graebner, 1908-1913; Adamović, 1911; Hirc, 1916; Hayek, 1924, 1927; Lovrić, 1981). Međutim, kasnije Trinajstić (2006) ipak zaključuje kako takson Q. crenata nije zastupljen u hrvatskoj flori te je do danas ovo pitanje ostalo dvojbeno. U novije vrijeme vrsta Q. crenata zabilježena je samo u kulturi u Perivoju Vladimira Nazora u Zadru (Perinčić, 2010; Nikolić 2017). Na osnovi naših rezultata temeljnih na molekularnoj filogeniji sa sigurnošću zaključujemo da je vrsta Q. crenata prisutna u hrvatskoj flori.a
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Dakskobler, Igor, Zvone Sadar et Andraž Čarni. « Phytosociological analysis of Quercus cerris woods in the sub-Mediterranean phytogeographical region of Slovenia / Fitocenološka analiza gozdov cera (Quercus cerris) v submediteranskem fitogeografskem območju Slovenije ». Folia biologica et geologica 58, no 2 (7 décembre 2017) : 5. http://dx.doi.org/10.3986/fbg0026.

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Denk, Thomas, Robert S. Hill, Marco C. Simeone, Chuck Cannon, Mary E. Dettmann et Paul S. Manos. « Comment on “Eocene Fagaceae from Patagonia and Gondwanan legacy in Asian rainforests” ». Science 366, no 6467 (14 novembre 2019) : eaaz2189. http://dx.doi.org/10.1126/science.aaz2189.

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Wilf et al. (Research Articles, 7 June 2019, eaaw5139) claim that Castanopsis evolved in the Southern Hemisphere from where it spread to its modern distribution in Southeast Asia. However, extensive paleobotanical records of Antarctica and Australia lack evidence of any Fagaceae, and molecular patterns indicate shared biogeographic histories of Castanopsis, Castanea, Lithocarpus, and Quercus subgenus Cerris, making the southern route unlikely.
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Bozsó, Miklós, Chang-Ti Tang, Zsolt Pénzes, Man-Miao Yang, Péter Bihari, Juli Pujade-Villar, Szabina Schwéger et George Melika. « A new genus of cynipid inquiline, Lithosaphonecrus Tang, Melika & ; Bozsó (Hymenoptera : Cynipidae : Synergini), with description of four new species from Taiwan and China ». Insect Systematics & ; Evolution 46, no 1 (24 janvier 2015) : 79–114. http://dx.doi.org/10.1163/1876312x-45032116.

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The cynipid inquilines genus Saphonecrus is known to be a polyphyletic group with distinct lineages. One lineage is associated with Synophrus in the Western Palaearctic on section Cerris oaks. Another involves the type species of Saphonecrus, S. connatus, and represents a distinct and probably early-diverging lineage with a Palaearctic distribution on white oaks. The third main lineage is predominantly Asian, and associated with Quercus subgenus Cyclobalanopsis and Quercus section Cerris and the oak-related Fagaceae including Lithocarpus. This third lineage shows large diversity, and includes the genus Ufo, the European lineage of S. undulatus and S. haimi, and the herein described new genus, Lithosaphonecrus Tang, Melika & Bozsó, known from Taiwan and China, with four new species: L. formosanus Melika & Tang, L. dakengi Tang & Pujade-Villar, L. huisuni Tang, Bozsó & Melika and L. yunnani Tang, Bozsó & Melika. All the four described species are associated only with Lithocarpus. Descriptions, diagnoses, biology, and host associations for the new genus and species are given, as well as a key to species and cynipid inquilines genera. All taxa are supported by morphological and molecular data.
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Kotroczó, Zsolt, Zsuzsa Veres, István Fekete, Mária Papp et János Attila Tóth. « Effects of Climate Change on Litter Production in a Quercetum petraeae-cerris Forest in Hungary ». Acta Silvatica et Lignaria Hungarica 8, no 1 (1 décembre 2012) : 31–38. http://dx.doi.org/10.2478/v10303-012-0003-6.

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Abstract - Climate change is a global problem. During the last century the increase of annual average temperature was 0.68°C, while the decrease of annual average of precipitation was 83 mm in Hungary. According to the long term meteorological data of Síkfőkút forest ILTER site the annual average temperature increased while average of yearly precipitation decreased, the forest climate became warmer and dryer. These processes could considerably contribute to forest decline, not only in the Quercetum petraeae-cerris stand of Síkfőkút, but everywhere in the country. Species composition and structure of the forest have changed considerably, as 68% of sessile oak (Quercus petraea) and 16% of Turkey oak (Quercus cerris) have died. Forest decline resulted in the breaking up of the formerly closed canopy, and consequently, in the formation of gaps in the forest. In the gaps, a secondary canopy developed with tree species of less forestry value. As a consequence, mass regeneration of field maple (Acer campestre) appeard in the gaps. The formation of gaps accelerated the warming and aridity of forests. In the article we answer the following question: how did climatic change and changing forest structure influence the leaf-litter production in the last four decades?
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Moussa, Zinette, Elia Choueiri et Abdallah Hanna. « New Invasive Insects Associated with Oak Forests in Lebanon ». Arab Journal for Plant Protection 39, no 2 (juin 2021) : 164–72. http://dx.doi.org/10.22268/ajpp-039.2.164172.

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Oak forests (Fagaceae) are native in Lebanonand occupy the largest areas of approximately 40,000 ha. The most common species are Quercus calliprinos, Q. infectoria, Q. cerris var. pseudo cerris andQ.brantii. Due to climate change and human activities, oak forests have become more vulnerable to native and exotic invasive pests. A total of 26insect species associated with oak trees were recently identified in Lebanon. The most dangerous insect pestisthe gypsy moth Lymantria dispar (Lepidoptera), onQ. calliprinos andQ. Cerris. The oak leafminer Phyllonorycter libanotica (Lepidoptera)and the Eriophidae(Accari) arethe most species recorded on Q. infectoriaand Q.calliprinosfollowed by the giant mealybug Ceroputo pilosellae(Hemiptera) on Q. infectoriaand Q.calliprinosandthe oak mothThaumetopoea sp.(Lepidoptera) on Q. calliprinos and Q. Cerris. Eightnew species were recorded for the first time in Lebanon on oak and are listed in this paper. Fivespecies of Cinipidae (Hymenoptera): Andricus caputmedusae, A. cecconi, A. sternlichti, Plagiotrochus quercusilicisand Neuroterus quercusbaccarum, one speciesof Scolytidae,Xylosandrus compactus(Coleoptera),one species ofKermesidaeKermes echinatus (Hemiptera)and one species of Diaspididae,Koroneaspis aegilopos(Hemiptera).Keywords: Lebanon, oak, forest decline, invasive species, outbreak
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Ragazzi, A., S. Moricca, S. Vagniluca, C. Comparini et I. Dellavalle. « Leaf Water Potential and Peroxidase activity in Quercus cerris and Quercus pubescens after Inoculation with Diplodia mutila ». Journal of Phytopathology 147, no 1 (janvier 1999) : 55–59. http://dx.doi.org/10.1046/j.1439-0434.1999.147001055.x.

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Benucci, Gian Maria Niccolò, Andrea Gógán Csorbai, Leonardo Baciarelli Falini, Mattia Bencivenga, Gabriella Di Massimo et Domizia Donnini. « Mycorrhization of Quercus robur L., Quercus cerris L. and Corylus avellana L. seedlings with Tuber macrosporum Vittad. » Mycorrhiza 22, no 8 (8 mai 2012) : 639–46. http://dx.doi.org/10.1007/s00572-012-0441-3.

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Güray Kutbay, H., et Mahmut Kilinç. « Sclerophylly in Quercus cerris L. var. cerris and Phillyrea latifolia L. and edaphic relations of these species ». Vegetatio 113, no 2 (août 1994) : 93–97. http://dx.doi.org/10.1007/bf00044228.

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Hălălișan, Aureliu-Florin, Florin Dinulică, Dan Marian Gurean, Codrin Codrean, Nikolay Neykov, Petar Antov et Nikolai Bardarov. « Wood Colour Variations of Quercus Species in Romania ». Forests 14, no 2 (26 janvier 2023) : 230. http://dx.doi.org/10.3390/f14020230.

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Wood colour metrics are increasingly being used in wood technology and ecology studies. Researchers usually determine the colours of the wood after treatment or in different habitats. There is very little research dedicated to the problem of colour variations among one specific species harvested in different forests or regions. The main purpose of the current research is to reveal and estimate the colour variability of oak species. For this study, a total of 89 samples were taken from the heartwood of seven oak species (Quercus robur L., Quercus cerris L., Quercus rubra L., Quercus pedunculiflora K. Koch., Quercus pubescens Willd., Quercus petraea (Matt.) Liebl., and Quercus palustris Muenchh.). The CIELAB system was used for the assessment of the colour differences. To determine the colour groups and variations, K-means clustering was used. The results show that colour variations do exist. According to the cluster analysis, at least five types of oak wood can be distinguished (because in some clusters, very few samples were present) in the investigated forests. The differences are mainly observed in terms of the lightness (L*) and yellowness (b*). Redness is not a feature by which oak wood differs, but the wood can be brighter or more yellow in some of the samples. The density of the Romanian oaks in the sample does not influence the colour coordinates. The only coordinate affected is a*, but with a very small probability.
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