Dynamic of dominance, growth and bromatology of<i>Eragrostis plana</i>Nees in secondary vegetation area

Scheffer-Basso, Simone Meredith; Cecchin, Kalinca; Favaretto, Adriana

doi:10.5935/1806-6690.20160070

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…This study was carried out at the Laboratório Multidisciplinar Vegetal of Instituto de Ciências Biológicas of Universidade de Passo Fundo (UPF), Passo Fundo (28 o 15' S, 52 o 24' W), Rio Grande do Sul State, Brazil. The Annoni grass plants from which the material for the research was collected were present in an area of the secondary vegetation, which had a predominance of this grass (Scheffer-Basso et al, 2016) on the university campus. The soil of the area, classified as dystrophic Dark Red Latosol, was collected and analyzed (Tedesco et al, 1985), in triplicate, at the Laboratório de Solos/UPF.…”

Section: Methodsmentioning

confidence: 99%

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

2019

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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.

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Section: Methodsmentioning

confidence: 99%

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

2019

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“…Moreover, invasion generates a positive feedback because E . plana is avoided by livestock due to its high fibre content while native species are overgrazed, which accelerates the expansion process (Bremm et al, 2012, 2016; Scheffer‐Basso et al, 2016). Consequently, E .…”

Section: Introductionmentioning

confidence: 99%

“…aerenchyma and starch in the parenchymatic pith; Favaretto et al, 2015). Moreover, invasion generates a positive feedback because E. plana is avoided by livestock due to its high fibre content while native species are overgrazed, which accelerates the expansion process (Bremm et al, 2012(Bremm et al, , 2016Scheffer-Basso et al, 2016). Consequently, E. plana invasion has been associated with the reduction of native species richness and cover Dresseno et al, 2018), and the loss of forage palatability for livestock grazing (Reis & Coelho, 2000;Medeiros & Focht, 2007;Medeiros et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Disentangling by additive partitioning the effects of invasive species on the functional structure of communities

Guido

Blanco

Pillar

2021

J Vegetation Science

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Questions: Eragrostis plana is the most invasive species in grasslands of southern Brazil. We ask how it affects the functional structure of communities considering leaf traits related to forage palatability for grazers. As consensus is lacking about whether to include or omit the invasive species in the analysis, we propose a method for partitioning functional diversity (FD) and community-weighted means (CWMs) of invaded communities into invasive and resident species as additive components. Location: Southern Brazil. Methods: Permanent plots were located on a natural grassland that was partially invaded by E. plana. Invader removal was performed by four different treatments (n = 10): (a) no removal, (b) clipping, (c) herbicide, and (d) hand-pulling. Additionally, we located plots (n = 10) (e) in an adjacent non-invaded patch. With data from annual vegetation surveys and leaf traits (mass per area, LMA; dry matter content, LDMC; and force to tear [toughness], Ft), we assessed temporal changes (2012-2016) in FD and CWMs, partitioned into resident and invasive components. Partitioning was based on 0 or 1 weights attributed to invasive and resident species. Temporal trajectories of communities by fuzzy-weighted species composition were also evaluated.Results: Invasion modified the resident community in terms of CWMs of LDMC and Ft and fuzzy-weighted composition, but FD was not affected. Resident species of invaded plots contributed less to CWM values of LDMC and Ft than non-invaded communities. However, E. plana´s higher values of Ft increased the total community toughness. Removals of the invasive were not enough to make the functional structure of resident communities similar to that of non-invaded ones.Conclusions: Species loss associated to invasion is not random, as E. plana displaces species with higher contribution to CWM of LDMC and Ft. The contribution of invasives to the total community increases toughness, decreasing the forage palatability of invaded grasslands. Our partition method helps to disentangle the additive components of such effects on resident and invasive species.

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“…Although P. amboinicus EO is well studied, its bioherbicide potential was investigated for the first time in this study, where we tested its effect on germination and initial growth of Eragrostis plana Nees (Poaceae), the most abundant invasive plant in the pastures of southern Brazil. Rapid dispersion, facilitated by abundant seed production and allelopathic effects on other plants, made the species a difficult pest to control [24]. The impacts caused by this invasive species mainly refer to the replacement of native vegetation in many regions, which significantly impairs the feeding quality of the herd, causing considerable damage to livestock production [25].…”

Section: Introductionmentioning

confidence: 99%

Chemical and thermal profile of Plectranthus amboinicus essential oil for its application as a bioherbicide

Maldaner¹,

Oliveira

Santos

et al. 2021

Sci. Plena

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The species Plectranthus amboinicus is an aromatic herb with great application in popular medicine due to the diversity of biological properties. Chemically, its essential oil (EO) is characterized by two chemotypes, thymol and carvacrol, which vary depending on factors such as seasonality. Despite being an extensively exploited species, studies of the bioherbicidal potential of this species are insufficient. In this context, the EO of P. amboinicus leaves, extracted in two different seasonal periods, were characterized regarding chemical profile (by gas chromatography mass spectrometry - GC-MS) and thermal profile (DTG) and was subjected to bioherbicide tests (germination test and seedling development) against Eragrostis plana, commonly known as capim annoni, an invader of pastures in the Pampas region. P. amboinicus EO was a potent inhibitor of E. plana germination, reducing accumulated germination by over 70% when exposed to 0.1% EO, and a complete inhibition of germination was observed when exposed to 0.5%. Following the effects observed in germination, the initial growth of E. plana was significantly affected by concentrations above 0.05%. The major constituent identified via GC-MS was carvacrol, representing 87.5% of the volatile composition of P. amboinicus leaves. In addition, P. amboinicus EO presented high thermal stability up to 100 °C, which is an interesting result regarding its use as a bioproduct.

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Dynamic of dominance, growth and bromatology ofEragrostis planaNees in secondary vegetation area

Cited by 8 publications

References 19 publications

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

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

Disentangling by additive partitioning the effects of invasive species on the functional structure of communities

Chemical and thermal profile of Plectranthus amboinicus essential oil for its application as a bioherbicide

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