Pseudohypericin and Hyperforin inHypericum perforatumfrom Northern Turkey: Variation among Populations, Plant Parts and Phenological Stages

2008 ◽  
Vol 50 (5) ◽  
pp. 575-580 ◽  
Author(s):  
Cüneyt Çirak ◽  
Jolita Radusiene ◽  
Valdimaras Janulis ◽  
Liudas Ivanauskas
Keyword(s):  
Phenological Stages ◽  
Plant Parts

scholarly journals Variation in concentrations of major bioactive compounds in Prunella vulgaris L. related to plant parts and phenological stages

2012 ◽  
Vol 45 (2) ◽  
pp. 171-175 ◽  
Author(s):  
Yuhang Chen ◽  
Zaibiao Zhu ◽  
Qiaosheng Guo ◽  
Lixia Zhang ◽  
Xiaoming Zhang
Keyword(s):  
Bioactive Compounds ◽  
Prunella Vulgaris ◽  
Phenological Stages ◽  
Plant Parts

Secondary metabolites in Hypericum perfoliatum: variation among plant parts and phenological stages

2007 ◽  
Vol 117 (1) ◽  
pp. 29-36 ◽  
Author(s):  
Cüneyt Çιrak ◽  
Jolita Radušienė ◽  
Valdimaras Janulis ◽  
Liudas Ivanauskas
Keyword(s):  
Secondary Metabolites ◽  
Phenological Stages ◽  
Plant Parts

The Influence of Glyphosate on Bud Dormancy in Leafy Spurge (Euphorbia esula)

Weed Science ◽  
1987 ◽  
Vol 35 (1) ◽  
pp. 6-10 ◽  
Author(s):  
Bruce D. Maxwell ◽  
Michael E. Foley ◽  
Peter K. Fay
Keyword(s):  
Soil Surface ◽  
Leafy Spurge ◽  
Euphorbia Esula ◽  
Soil Freezing ◽  
Phenological Stage ◽  
Full Bloom ◽  
Phenological Stages ◽  
Plant Parts ◽  
Treated Leaf ◽  
Number Of Stems

Glyphosate [N-(phosphonomethyl)glycine] was applied in the spring and fall to leafy spurge (Euphorbia esulaL. # EPHES) in the field at rates of 0.14 to 4.48 kg ai/ha. Fall applications of glyphosate at rates of 0.56 to 4.48 kg/ha stimulated axillary branching and caused an increase in the number of stems/m2by the end of the following summer in a dense population. This was a result of shoot growth from buds on the crown region of the root system. The absorption and translocation of14C-glyphosate applied to leaves of mature leafy spurge plants were evaluated at prebloom, full-bloom, and senescence phenological stages. Approximately 81% of the14C-glyphosate applied to the leaves of senescing plants was absorbed. There was a decrease in the proportion of14C translocated out of the treated leaf when applications were made after full bloom. Translocation of14C to the treated stem, nontreated stems, root crown, and roots did not differ with phenological stage in 1983. Translocation and concentration of14C in most plant parts in 1985 differed with phenological stage. Translocation to the crown buds as a percentage of the14C absorbed was highest at the senescence stage. At senescence and before soil freezing, leafy spurge crown buds demonstrate transient but active elongation toward the soil surface. This active development may account for the enhanced translocation of14C into the crown buds.

scholarly journals Intake of Medusahead by Sheep: Influence of Supplements, Silica and Individual Animal Variation

2015 ◽  
Vol 8 (2) ◽  
pp. 151-159 ◽  
Author(s):  
Juan J. Villalba ◽  
Elizabeth A. Burritt
Keyword(s):  
Individual Differences ◽  
Tall Fescue ◽  
High Energy ◽  
Plant Part ◽  
Yeast Culture ◽  
Phenological Stages ◽  
Plant Parts ◽  
Beet Pulp ◽  
Energy Supplements ◽  
Better Than

Grazing represents a sustainable alternative for the control of medusahead infestations but intake of medusahead by ruminants is typically low. We determined in sheep whether (1) high-energy supplements enhance medusahead intake and preference relative to a treatment without supplementation and (2) individual differences in medusahead intake transfer to individual differences in the ingestion of a silica-containing ration. Groups of lambs (n= 10) were individually penned and randomly assigned to three supplementation treatments: (1) Control (no supplement); (2) Calcium (Ca) Propionate (beet pulp : barley : Ca propionate, 67 : 30 : 3); or (3) Yeast (beet pulp : barley : yeast culture, 65 : 30 : 5). After supplementation, all animals had ad libitum access to medusahead in late vegetative to mid-reproductive (Trial 1), and late-reproductive phenological stages (Trial 2). Medusahead preferences were assessed by offering sheep a choice between medusahead and tall fescue hay. Plant part preferences were assessed by offering a choice between medusahead tops (mostly seedheads and awns) and mid-plant parts (mostly stems + leaves). Intake of medusahead was low and cyclic, declining towards the end of each trial (P < 0.0001) and there were no treatment differences (P > 0.10). Lambs preferred tall fescue hay to medusahead and medusahead tops to mid-plant parts (P < 0.0001). Supplemented lambs gained more weight than control lambs (P < 0.10). Thus, supplemented lambs performed better than nonsupplemented controls without reducing their intake of medusahead. In Trial 3, two new groups of lambs were formed based on their intake of medusahead during Trials 1 and 2 (n= 10). One group consistently ate more medusahead and more of a ration containing silica (alfalfa : silica, 97 : 3) than the other (P < 0.10). A significant and consistent degree of individual variation was measured among lambs—irrespective of treatment—regarding their ability to ingest medusahead and silica. This variation represents a promising option for maximizing use of medusahead by livestock in rangelands.

Essential oil content and composition ofAchillea biebersteiniiAfan. in different plant parts and phenological stages

2012 ◽  
Vol 24 (1) ◽  
pp. 25-29 ◽  
Author(s):  
Seyed Fazel Mirahmadi ◽  
Fatemeh Sefidkon ◽  
Mohammad Reza Hassandokht ◽  
Mohammad Esmail Hassani
Keyword(s):  
Essential Oil ◽  
Oil Content ◽  
Phenological Stages ◽  
Plant Parts

Condensed tannins concentration of selected prairie legume forages as affected by phenological stages during two consecutive growth seasons in western Canada

2014 ◽  
Vol 94 (5) ◽  
pp. 817-826 ◽  
Author(s):  
Y. Li ◽  
A. D. Iwaasa ◽  
Y. Wang ◽  
L. Jin ◽  
G. Han ◽  
...  
Keyword(s):  
Condensed Tannins ◽  
Vegetative Stage ◽  
Maturity Stage ◽  
Western Canada ◽  
Flowering Stage ◽  
Phenological Stages ◽  
Plant Parts ◽  
Maturity Stages ◽  
Seed Maturity ◽  
Whole Plant

Li, Y., Iwaasa, A. D., Wang, Y., Jin, L., Han, G. and Zhao, M. 2014. Condensed tannins concentration of selected prairie legume forages as affected by phenological stages during two consecutive growth seasons in western Canada. Can. J. Plant Sci. 94: 817–826. Studies have shown that condensed tannins (CT) at appropriate concentrations improve nutrient digestion in animals and influence ecosystem processes. However, knowledge of CT concentration in different phenological stages and different plant parts of non-conventional legumes growing in the western Canadian prairies is lacking for feed and grazing management. The research objectives were to determine the level and distribution of total CT (TCT), extractable CT (ECT) and protein-bound (PCT) or fiber-bound CT (FCT) concentrations in the whole plant of legume forages at different phenological (vegetative, flowering, seed maturity) stages and plant parts (leaves, stems, inflorescences and inflorescences+seedpods) using the Butanol-HCl procedure. Whole plant samples of purple prairie clover (Dalea purpurea Vent.), white prairie clover (D. candida Michx. ex Willd), sainfoin (Onobrychis viciifolia Scop.) and Canadian milkvetch (Astragalus canadensis L.) were collected in the 2011 and 2012 growing seasons from replicated small trial plots at vegetative, flowering and seed maturity stages. Species, phenological stages and their interactions all significantly affect the TCT, ECT, PCT and FCT concentrations in whole plant and plant parts (P<0.001). Concentrations of ECT and TCT increased for all species as they matured from vegetative to seed maturity, except for sainfoin where the vegetative stage had the highest ECT and TCT levels. The highest mean ECT and TCT concentrations for purple prairie clover and white prairie clover were found in the inflorescences part at flowering stage, while sainfoin had the highest ECT and TCT concentrations in the leaves at vegetative stage. There was little variation for PCT among different phenological stages in whole plant for species except for purple prairie clover and white prairie clover which had higher (P<0.05) PCT at seed maturity than at flowering stage. Only trace amounts of FCT were detected from either whole plant or different fractions of all plant species, except Canadian milkvetch. Condensed tannins were not observed in Canadian milkvetch except for trace amounts in the seed coat at seed maturity stage. The results demonstrate that legumes differ in their condensed tannin content which could potentially be used in pasture management.

Sign in / Sign up

Export Citation Format

Share Document