Polycyclism and phenological variability in the common oak (Quercus robur L.)

Bobinac, Martin; Batos, Branislava; Miljković, Danijela; Radulovic, Stojanka

doi:10.2298/abs1201097b

Cited by 23 publications

(14 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Q. robur bark contains a high amount of tannins (hydrolyzable and condensed tannins) (8%–20%). These tannins are composed of either galloyl esters and their derivatives (gallotannins, ellagitannins, and complex tannins) or oligomeric and polymeric proanthocyanidins and can possess different interflavanyl couplings and substitution patterns (condensed tannins) [11,12]. However, there is no information in the literature regarding the phenolic profile of bark extracts of this species.…”

Section: Introductionmentioning

confidence: 99%

Polyphenol Profile and Pharmaceutical Potential of Quercus spp. Bark Extracts

Elansary

Szopa

Kubica

et al. 2019

Plants

View full text Add to dashboard Cite

Targeted profiling of polyphenols in trees may reveal valuable sources of natural compounds with major applications in pharmacology and disease control. The current study targeted the profiling of polyphenols using HPLC-DAD in Quercus robur, Q. macrocarpa and Q. acutissima bark extracts. Free radical scavenging of each extract was investigated using antioxidant assays. Antimicrobial activities against a wide spectrum of bacteria and fungi were explored, as well as anticancer activities against different cancer cell lines. The HPLC-DAD analyses revealed the availability of several polyphenols in high amounts, including ellagic acid (in Q. robur) and caffeic acid (in Q. macrocarpa) in all three species. The bioactivity assay revealed high antioxidant activity in Q. robur compared to that of the other species, as well as phenolic standards. The three oak bark extracts showed clear antibacterial activities against most bacteria tested, with the highest antibacterial activities in the extracts of Q. robur. In addition, the three extracts showed higher antibacterial activities against Pseudomonas aeruginosa, Micrococcus flavus, and Escherichia coli compared to that of other bacteria. There were strong antifungal activities against some fungi, such as Aspergillus flavus, Penicillium funiculosum, and Penicillium ochrochloron. There were also noticeable anticancer activities against MCF-7, HeLa, Jurkat, and HT-29 cell lines, with the highest anticancer activity in the extracts of Q. robur. This is the first study that reveals not only novel sources of important polyphenols (e.g., ellagic acid) in Q. robur, Q. macrocarpa and Q. acutissima bark but also their anticancer activities against diverse cancer cell lines.

show abstract

Section: Introductionmentioning

confidence: 99%

Polyphenol Profile and Pharmaceutical Potential of Quercus spp. Bark Extracts

Elansary

Szopa

Kubica

et al. 2019

Plants

View full text Add to dashboard Cite

show abstract

“…For example, tree saplings can receive more than 90% of the total annual irradiance before leaf expansion of adult trees (Augspurger, Cheeseman, & Salk, 2005). Substantial inter-and intraspecific variation in the timing of tree leaf expansion exists (Bobinac, Batos, Miljković, & Radulović, 2012;Lechowicz, 1984;Wesolowski & Rowinski, 2006), which could create large differences in the yearly biological relevant light transmitted to the forest floor between species compositions. This has never been studied in temperate forests as far as we know.…”

Section: Introductionmentioning

confidence: 99%

How tree species identity and diversity affect light transmittance to the understory in mature temperate forests

Sercu

Baeten

Coillie

et al. 2017

Ecology and Evolution

View full text Add to dashboard Cite

Light is a key resource for plant growth and is of particular importance in forest ecosystems, because of the strong vertical structure leading to successive light interception from canopy to forest floor. Tree species differ in the quantity and heterogeneity of light they transmit. We expect decreases in both the quantity and spatial heterogeneity of light transmittance in mixed stands relative to monocultures, due to complementarity effects and niche filling. We tested the degree to which tree species identity and diversity affected, via differences in tree and shrub cover, the spatiotemporal variation in light availability before, during, and after leaf expansion. Plots with different combinations of three tree species with contrasting light transmittance were selected to obtain a diversity gradient from monocultures to three species mixtures. Light transmittance to the forest floor was measured with hemispherical photography. Increased tree diversity led to increased canopy packing and decreased spatial light heterogeneity at the forest floor in all of the time periods. During leaf expansion, light transmittance did differ between the different tree species and timing of leaf expansion might thus be an important source of variation in light regimes for understory plant species. Although light transmittance at the canopy level after leaf expansion was not measured directly, it most likely differed between tree species and decreased in mixtures due to canopy packing. A complementary shrub layer led, however, to similar light levels at the forest floor in all species combinations in our plots. Synthesis. We find that a complementary shrub layer exploits the higher light availability in particular tree species combinations. Resources at the forest floor are thus ultimately determined by the combined effect of the tree and shrub layer. Mixing species led to less heterogeneity in the amount of light, reducing abiotic niche variability.

show abstract

“…praecox and a late Q. robur fo. tardifolia —has been observed (Vikhrov 1954 ; Kleinschmit 1993 ; Rubtsov 1996 ; Wesołowski and Rowiński 2008 ; Batos et al 2012 ; Bobinac et al 2012 ). It should also be noted here that phenological phases can follow diverse patterns in subsequent growing seasons (Ermich 1959 ).…”

Section: Discussionmentioning

confidence: 99%

Did the late spring frost in 2007 and 2011 affect tree-ring width and earlywood vessel size in Pedunculate oak (Quercus robur) in northern Poland?

et al. 2015

View full text Add to dashboard Cite

Trees are sensitive to extreme weather and environmental conditions. This sensitivity is visible in tree-ring widths and cell structure. In our study, we hypothesized that the sudden frost noted at the beginning of May in both 2007 and 2011 affected cambial activity and, consequently, the number and size of vessels in the tree rings. It was decided to test this hypothesis after damage to leaves was observed. The applied response function model did not show any significant relationships between spring temperature and growth. However, this method uses average values for long periods and sometimes misses the short-term effects. This is why we decided to study each ring separately, comparing them with rings unaffected by the late frost. Our study showed that the short-term effect of sudden frost in late spring did not affect tree rings and selected cell parameters. The most likely reasons for this are (i) cambial activity producing the earlywood vessels before the occurrence of the observed leaf damage, (ii) the forest micro-climate protecting the trees from the harsh frost and (iii) the temperature decline being too short-lived an event to affect the oaks. On the other hand, the visible damage may be occasional and not affect cambium activity and tree vitality at all. We conclude that oak is well-adapted to this phenomenon.Electronic supplementary materialThe online version of this article (doi:10.1007/s00484-015-1107-6) contains supplementary material, which is available to authorized users.

show abstract

Polycyclism and phenological variability in the common oak (Quercus robur L.)

Cited by 23 publications

References 21 publications

Polyphenol Profile and Pharmaceutical Potential of Quercus spp. Bark Extracts

Polyphenol Profile and Pharmaceutical Potential of Quercus spp. Bark Extracts

How tree species identity and diversity affect light transmittance to the understory in mature temperate forests

Did the late spring frost in 2007 and 2011 affect tree-ring width and earlywood vessel size in Pedunculate oak (Quercus robur) in northern Poland?

Contact Info

Product

Resources

About