Attack by Platypus quercivorus Enhances Diameter Growth of Surviving Quercus serrata

Background: Quercus serrata Murray leaves have been used traditionally in the treatment of diabetes, dysmenorrhoea, inflammation and urinary tract infection. So, far no study had been reported on the toxicological profile and antioxidant properties of the plant. Objective: The present study was aimed to investigate the in-vivo toxicological profile and in-vitro antioxidant activities of the methanolic extract of standardized Quercus serrata leaves. Methods: Per-oral sub-acute toxicity study was performed in rats using three dose levels (200, 400 and 800 mg/kg b.w.) of the extract for 28-days. Control group received gum acacia suspended in water. Bodyweight was measured weekly. Biochemical parameters were analysed using the serum, the blood-cell count was done using whole blood. Pathological changes were also checked in highly perfused tissues. Further, in-vitro reducing power assay, nitric oxide scavenging assay, DPPH free-radical scavenging assay were performed to check the antioxidant activity of the extract. Results: There were no significant alterations in the blood-cell count and biochemical parameters analysed in the treatment group when compared with the normal control. Histopathology study of liver, kidney, pancreas, heart and brain revealed normal cellular architecture in the treatment groups alike the control group animals. Quercus serrata also showed a significant reduction of DPPH with IC50 4.48±0.254 µg/mL, in-vitro reducing power activity with IC50121.65±0.320 µg/mL and nitric oxide scavenging activity IC50 106.43±0.338 µg/mL. Conclusion: The above study showed that standardized methanolic extract of Quercus serrata leaves was safe after subacute oral administration in rats and has good antioxidant potential.

Download Full-text

Quercus serrata: Carrero, C. & Casmey, M.

IUCN Red List of Threatened Species ◽

10.2305/iucn.uk.2020-1.rlts.t78976635a78976638.en ◽

2019 ◽

Author(s):

Keyword(s):

Quercus Serrata

Download Full-text

Crop Tree Release of a Scarlet-Black Oak Stand

Northern Journal of Applied Forestry ◽

10.1093/njaf/5.2.96 ◽

1988 ◽

Vol 5 (2) ◽

pp. 96-99 ◽

Cited By ~ 5

Author(s):

Robert J. Mitchell ◽

John P. Dwyer ◽

Ralph A. Musbach ◽

Harold E. Garrett ◽

Gene S. Cox ◽

...

Keyword(s):

Stand Age ◽

Diameter Growth ◽

Precommercial Thinning ◽

Tree Thinning ◽

Black Oak

Abstract In 1953 and 1954 a series of crop tree thinning and pruning studies were initiated in 30- to 35-year-old stands composed predominantly of scarlet oak and black oak. Growth of the crop trees was monitored until the average stand age was 61. Removal of all trees whose crowns were within 8 ft of the 50 crop trees resulted in significantly increased diameter growth and cubic volume of wood produced. The moderate and heavy 50-crop-tree thinning treatments produced the highest net cubic volume per acre. Crop tree thinning also tended to reduce mortality during the study period. Yield increases due to thinning in this study were comparable to those previously determined to economically justify a precommercial thinning of the scarlet and black oak type in Missouri. North. J. Appl. For. 5:96-99, June 1988.

Download Full-text

Contact zone of two different chloroplast lineages and genetic guidelines for seed transfer in Quercus serrata and Quercus crispula

Plant Species Biology ◽

10.1111/1442-1984.12296 ◽

2020 ◽

Author(s):

Kataru Onosato ◽

Takuto Shitara ◽

Asako Matsumoto ◽

Ayumi Matsuo ◽

Yoshihisa Suyama ◽

...

Keyword(s):

Contact Zone ◽

Quercus Serrata ◽

Quercus Crispula ◽

Seed Transfer

Download Full-text

Precommercial Thinning Increases Spruce Yields in Boreal Mixedwoods in Alberta, Canada

Forests ◽

10.3390/f12040412 ◽

2021 ◽

Vol 12 (4) ◽

pp. 412

Author(s):

Ivan Bjelanovic ◽

Phil Comeau ◽

Sharon Meredith ◽

Brian Roth

Keyword(s):

Growth Models ◽

Growth And Yield ◽

Diameter Growth ◽

Growth Responses ◽

Projection System ◽

Precommercial Thinning ◽

Thinning Intensity ◽

Boreal Mixedwoods ◽

Using Data ◽

Mixedwood Stands

A few studies in young mixedwood stands demonstrate that precommercial thinning of aspen at early ages can improve the growth of spruce and increase stand resilience to drought. However, information on tree and stand responses to thinning in older mixedwood stands is lacking. To address this need, a study was initiated in 2008 in Alberta, Canada in 14 boreal mixedwood stands (seven each at ages 17 and 22). This study investigated growth responses following thinning of aspen to five densities (0, 1000, 2500, 5000 stems ha−1 and unthinned (control)). Measurements were collected in the year of establishment, and three and eight years later. Mortality of aspen in the unthinned plots was greater than in the thinned plots which were not significantly different amongst each other. Eight years following treatment, aspen diameter was positively influenced by thinning, while there was no effect on aspen height. The density of aspen had no significant effect on the survival of planted spruce. Spruce height and diameter growth increased with both aspen thinning intensity and time since treatment. Differentiation among treatments in spruce diameter growth was evident three years from treatment, while differentiation in height was not significant until eight years following treatment. Yield projections using two growth models (Mixedwood Growth Model (MGM) and Growth and Yield Projection System (GYPSY)) were initialized using data from the year eight re-measurements. Results indicate that heavy precommercial aspen thinning (to ~1000 aspen crop trees ha−1) can result in an increase in conifer merchantable volume without reducing aspen volume at the time of harvest. However, light to moderate thinning (to ~2500 aspen stems ha−1 or higher), is unlikely to result in gains in either deciduous or conifer merchantable harvest volume over those of unthinned stands.

Download Full-text