Effect of plant origin and phenological stage on the allelopathic activity of the invasive species Oxalis pes‐caprae

2021 ◽  
Author(s):  
Paula Lorenzo ◽  
Luís González ◽  
Victoria Ferrero
Keyword(s):  
Invasive Species ◽  
Phenological Stage ◽  
Plant Origin ◽  
Allelopathic Activity

scholarly journals Allelopathy and Allelochemicals of Eragrostis plana (Poaceae) and its Relation with Phenology and Nitrogen Fertilization

2017 ◽  
Vol 35 (0) ◽  
Author(s):  
K. CECCHIN ◽  
A. FAVARETTO ◽  
S.M. SCHEFFER-BASSO ◽  
C.D. BERTOL ◽  
S.O. CHINI
Keyword(s):  
Nitrogen Fertilization ◽  
High Performance ◽  
Phenological Stage ◽  
Flowering Stage ◽  
Chromatography Analysis ◽  
Allelopathic Activity ◽  
Aerial Parts ◽  
Main Plot ◽  
Chemical Attributes ◽  
Plot Design

ABSTRACT This study was conducted in order to verify if the phenological stage and the nitrogen fertilization interfere in the allelopathic activity and in the concentration of potentially allelopathic phenolic compounds of tough lovegrass (Eragrostis plana). The assay consisted of a bifactor 3 (0.100 and 200 kg N ha-1) x 2 (harvested in vegetative and reproductive stages), in a split plot design. The N doses constituted the main plot and the phenological stage during the harvest the subplots, resulting in six treatments. The tough lovegrass plants derived from each of the treatments were subjected to allelopathy bioassays, in which aqueous extracts of the aerial parts were applied to lettuce cypselae (Lactuca sativa) and to phytochemicals tests when ethanolic extracts were used, with subsequent partition with ethyl acetate, followed by a high-performance liquid chromatography analysis. There was nitrogen x phenological stage interaction on biological and chemical attributes. The allelopathic extracts were, in descending order of inhibition of germination, those from plants harvested at the vegetative stage and fertilized with 100 kg N and at the flowering stage with 200 kg N, which showed the highest catechin concentrations. The caffeic, ferulic, p-coumaric and vanillic acids were in a higher concentration in flowered and fertilized plants with 0 or 200 kg N. The management of the nitrogen fertilization and the harvesting age influence the allelopathic activity and the phytochemical composition of tough lovegrass.

scholarly journals Effect of Phenological Stage and Rooting Enhancers on Physiological Parameters in Stem Cuttings in the Process of Rhizogenesis of Rosa × alba ‘Maiden’s Blush’

Agriculture ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 572
Author(s):  
Marta Joanna Monder ◽  
Maciej Niedzielski ◽  
Konrad Woliński
Keyword(s):  
Storage Capacity ◽  
Naphthalene Acetic Acid ◽  
Stem Cuttings ◽  
Phenological Stage ◽  
Plant Origin ◽  
Flower Buds ◽  
Phenological Stages ◽  
Indole Butyric Acid ◽  
Nursery Production ◽  
Prolonged Stress

Once-blooming roses belong to difficult-to-root. One-bud leafy cuttings have limited storage capacity, due to the small size of the stem, and are exposed to prolonged stress conditions. The objective of this study was to examine if the treatment of the cuttings of Rosa × alba ‘Maiden’s Blush’ with plant origin preparations as rooting enhancers may increase their rooting percentage, chlorophyll a/b, and proteins concentration in leaves. The cuttings were prepared from shoots in four phenological stages: flower buds closed, flowers open, immediately after petal shedding, and 7–14 days after petal fall. The following were used: 0.4% indole butyric acid (Ukorzeniacz Aaqua), 0.2% naphthalene acetic acid (Ukorzeniacz Baqua), Bio Rhizotonic; Root Juice™, and Bio Roots. Controls included untreated cuttings. The highest rooting percentage was obtained after two treatments with 0.6% Bio Rhizotonic (81.5%), compared to the control (55.0%), using cuttings from shoots with flower buds closed, but the rooting enhancers did not show any unequivocal impact on rooting percentage in cuttings of all phenological stages or affected improvement this feature in cuttings harvested 7–14 after shedding petals with low root ability. However, the action of plant preparations affected positively higher soluble proteins and chlorophyll content. The plant-origin preparations can be used as alternatives to chemicals in nursery production.

scholarly journals Influence of Phenology and Post-Harvest Processing of Vegetal Material on the Allelopathy of Annoni Grass (Eragrostis plana) Extracts

2019 ◽  
Vol 37 ◽  
Author(s):  
S.M. SCHEFFER-BASSO ◽  
F. Jr. R. FIORENTIN ◽  
A. FAVARETTO
Keyword(s):  
White Clover ◽  
Plant Material ◽  
Allelopathic Effect ◽  
Distilled Water ◽  
Aqueous Extracts ◽  
Phenological Stage ◽  
Post Harvest ◽  
Allelopathic Activity ◽  
Germination And Growth ◽  
Growth Of Seedlings

ABSTRACT: The phenological stage, post-harvest processing and quantity of material can interfere in the allelopathic activity of extracts. The objective of this study is to test the allelopathic effect of aqueous extracts of the leaves of Annoni grass (Eragrostis plana), an invader of natural pastures. Twelve extracts were prepared by combining the phenological stage of the plants when harvesting the leaves (vegetative; flowering), post-harvest processing before extraction (fresh; dry at 40 oC), and the amount of plant material (5, 15, and 25 g 100 mL-1 distilled water). Two bioassays were conducted in a germination chamber, with evaluation of germination and growth of seedlings of lettuce (Lactuca sativa) and white clover (Trifolium repens). The extracts with higher allelopathic activity were further developed with 15 and 25 g of dried leaves and harvested in plants at the vegetative stage. Germination was attributed to being the greatest contribution to the divergence between the extracts. White clover was more sensitive to extracts, for which 50% to 67% of the extracts were effectively allelopathic (≥50% inhibition); in lettuce, between 8% and 58% of the extracts exhibited this potential. The phenological stage was the factor with a greater individual effect on the allelopathic activity on lettuce and white clover seedlings, and on lettuce germination. The post-harvest processing responded by the greater variation on germination and germination speed index of white clover. The sensitivity of the white clover to extracts of Annoni grass suggests a compromise of its establishment in pastures with the presence of the invader.

scholarly journals ALLELOPATHIC ACTIVITY OF INVASIVE SPECIES SOLIDAGO CANADENSIS L.

2015 ◽  
Author(s):  
Ligita BALEŽENTIENĖ
Keyword(s):  
Invasive Species ◽  
Plant Species ◽  
Total Phenolics ◽  
Invasion Success ◽  
Growth Stages ◽  
Solidago Canadensis ◽  
Aqueous Extracts ◽  
Native Plant ◽  
Allelopathic Activity ◽  
Phenolics Content

Solidago canadensis L. (Asteraceae) spread throughout the world and also is enlisted in the National list of invasive species (2012). Here the allelopathic activity of the species was assessed in terms of further understanding of their distributions over the range of native spread. The invasion success of S. Canadensis was tried to base on the estimation of the total phenolics content (TPC) in the plant aqueous leachates at different growth stages. Allelopathic impacts (total phenolics content, total concentration and dynamic, conventional coumarine units, CCU) of S. canadensis were examined during 2012-2013 in Laboratory of raw materials, agro and zootechnics research, Aleksandras Stulginskis University. The plants were sampled in spring (May, rosette), summer (June, flowering) and autumn (September, seed maturity) for preparing the aqueous extracts. The biochemical (allelopathic) characteristics of S. canadensis aqueous extracts were examined at different plant growth stages. Principal (0–9) and secondary (0–9) growth stages as per universal BBCH scale description and coded using uniform two-digit code of phenologically similar growth stages of all mono- and dicotyledonous plant species. The TPC ranged between 0.968 mg ml-1 to 23.591 mg ml-1 depending on the plant ontogenetic stage, plant part and extract concentration (r = -0.7). Due to accumulated allelochemicals, the invasive S. canadensis, might acquire distribution advantage in new territories outside the native habitat range, through the inhibitory effects on germination of native plant species.

Invasive Species

2017 ◽  
Keyword(s):  
Invasive Species

Invasive species to surge as ship traffic soars on the high seas

Nature ◽  
2019 ◽  
Vol 567 (7749) ◽  
pp. 437-437
Keyword(s):  
Invasive Species ◽  
Ship Traffic ◽  
High Seas

Tsunami wreckage serves as liferafts for invasive species

Nature ◽  
2017 ◽  
Author(s):  
Rachael Lallensack
Keyword(s):  
Invasive Species

Invasive Shot Hole Borers Euwallacea fornicatus, E. kuroshio, and E. perbrevis (Coleoptera: Curculionidae: Scolytinae)

EDIS ◽  
2020 ◽  
Vol 2020 (1) ◽  
pp. 7
Author(s):  
Demian F. Gomez ◽  
Jiri Hulcr ◽  
Daniel Carrillo
Keyword(s):  
South Africa ◽  
Invasive Species ◽  
Prevention And Control ◽  
Economic Impacts ◽  
Forest Resources ◽  
Economic Damage ◽  
Ambrosia Beetles ◽  
Invasive Insects ◽  
The World ◽  
And Control

Invasive species, those that are nonnative and cause economic damage, are one of the main threats to ecosystems around the world. Ambrosia beetles are some of the most common invasive insects. Currently, severe economic impacts have been increasingly reported for all the invasive shot hole borers in South Africa, California, Israel, and throughout Asia. This 7-page fact sheet written by Demian F. Gomez, Jiri Hulcr, and Daniel Carrillo and published by the School of Forest Resources and Conservation describes shot hole borers and their biology and hosts and lists some strategies for prevention and control of these pests. http://edis.ifas.ufl.edu/fr422

Ancient fish and recent invaders: white sturgeon Acipenser transmontanus diet response to invasive-species-mediated changes in a benthic prey assemblage

2014 ◽  
Vol 514 ◽  
pp. 163-174 ◽  
Author(s):  
SC Zeug ◽  
A Brodsky ◽  
N Kogut ◽  
AR Stewart ◽  
JE Merz
Keyword(s):  
Invasive Species ◽  
White Sturgeon ◽  
Acipenser Transmontanus ◽  
Benthic Prey
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