Allelopathic potential of bark and leaves of Esenbeckia leiocarpa Engl. (Rutaceae)

Souza, Flaviana Maluf; Gandolfi, Sérgius; Gualtieri, Sônia Cristina Juliano; Rodrigues, Ricardo Ribeiro

doi:10.1590/s0102-33062010000100016

Cited by 21 publications

(15 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This suggests that the allelopathic and osmotic potentials of Sonchus oleraceus extract both contribute to the inhibition of germination and seedling growth of the target species. Previous studies confirmed the significant role of both allelopathic and osmotic effects of plant extracts in inhibiting seed germination and seedling growth (Wardle et al 1992;Souza et al 2010). …”

Section: Discussionmentioning

confidence: 61%

See 1 more Smart Citation

Allelopathic effects of Sonchus oleraceus L. on the germination and seedling growth of crop and weed species

et al. 2014

View full text Add to dashboard Cite

We assessed the allelopathic effects of the aqueous extract of Sonchus oleraceus dry shoots on the germination and seedling growth of Trifolium alexandrinum, three weed species (Brassica nigra, Chenopodium murale and Melilotus indicus) and S. oleraceus itself. We assayed four different concentrations of the aqueous extract (w v −1 ): 1%, 2%, 3% and 4%. To determine whether the effects of the extract were attributable to the presence of allelopathic compounds, its osmotic potential or both, we prepared concentrations of polyethylene glycol (PEG) with osmotic potentials equivalent to those of the aqueous extract. All concentrations of the plant extract completely inhibited the germination and seedling growth of C. murale. The lowest concentration of the plant extract partially inhibited germination and seedling growth of B. nigra, M. indicus and S. oleraceus, whereas the higher concentrations inhibited those parameters completely. The germination of T. alexandrinum was not affected by the aqueous extract at 1% or 2%. In general, the aqueous extracts were more effective in inhibiting seed germination and seedling growth than were the PEG solutions. Phytochemical analyses revealed that phenols and alkaloids were the most abundant compounds in S. oleraceus dry matter. Our results suggest that the aqueous extract of S. oleraceus has an allelopathic effect on some weeds, and its usefulness as a bioherbicide therefore merits further study.

show abstract

Section: Discussionmentioning

confidence: 61%

“…In such experiments, root and shoot lengths are the most important variables, as indicated by many authors (Souza et al 2010;Hussain et al 2011). Root and shoot lengths (expressed as percentages of the control values) were determined eight days after seeding by measuring similar seedlings in each dish.…”

Section: Germination Indices and Seedling Growthmentioning

confidence: 99%

Allelopathic effects of Sonchus oleraceus L. on the germination and seedling growth of crop and weed species

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Na fração oposta à germinante (S), além dos valores finais de regeneração de raízes terem sido inferiores aos das demais frações, também verificou-se atraso no início de emissão de novas raízes (Figura 1), que ocorreu do décimo quinto ao vigésimo quinto dias, enquanto nas demais frações as emissões concentraram-se no quinto dia e finalizaram no décimo quinto dia. O atraso na germinação das sementes de uma espécie, promovido pela liberação de substâncias inibidoras de outra, tem sido demonstrado em estudos de alelopatia (Hegab et al, 2008;Gatti et al, 2010;Souza et al, 2010;Zhang et al, 2011), o que indica que, em processos de inibição, a redução da percentagem final de germinação nem sempre é evidente. No presente trabalho, contudo, observaramse ambos os efeitos sobre a regeneração de novas raízes (inibição e atraso) em razão do início da germinação das sementes.…”

Section: Resultsunclassified

Potencial de inibição da regeneração de raízes e plântulas em sementes germinantes de Eugenia pyriformis

Amador

Barbedo

2011

Pesq. agropec. bras.

View full text Add to dashboard Cite

Resumo -O objetivo deste trabalho foi avaliar o potencial de inibição da formação de raízes e plântulas, em sementes germinantes de uvaieira (Eugenia pyriformis), fragmentadas e fissuradas. As sementes foram separadas por tamanho em dois grupos. Cada grupo foi separado em dois subgrupos, um dos quais foi submetido a teste de germinação. As sementes de cada subgrupo foram submetidas a dois tipos de incisão (total ou parcial) e, em seguida, foram avaliadas quanto à produção de raízes e plântulas. Em sementes com incisão parcial, que apresentavam apenas uma plântula desenvolvida, completou-se a incisão até que as metades fossem separadas. A metade com a raiz foi descartada, e sua complementar foi colocada para germinar, para avaliação da produção de raízes e plântulas nessas frações sem raízes. Em todos os experimentos, utilizou-se o delineamento inteiramente casualizado, em arranjo fatorial 2x2 (tamanho das sementes x germinação visível) e 2x4 (tamanho das sementes x tipo de incisão). As sementes fracionadas de uvaieira apresentam potencial para regeneração de raízes e plântulas, e podem produzir mais de uma muda por semente. A germinação inicia processos de inibição da regeneração de novas raízes e plântulas na semente, e a incisão dos cotilédones pode bloquear essa inibição.Termos para indexação: fracionamento, inibidores, produção de mudas, regenerabilidade, uvaieira. Potential for regeneration inhibition of roots and seedlings in germinating Eugenia pyriformis seedsAbstract -The objective of this work was to evaluate the potential for inhibiting the formation of new roots and seedlings from germinating seeds of "uvaieira" (Eugenia pyriformis), fragmented and fissured. Seeds were separated by size into two groups. Each group was separated into two subgroups, one of which was subjected to germination test. Seeds of each subgroup were subjected to two types of incision (total or partial) and, then, evaluated as for the production of roots and seedlings. Seeds with partial incision, which had only one developed plantlet, had the incision completed until the halves were separated. The half fragment containing the root was discarded, and its complementary part was placed to germinate, in order to evaluate the production of roots and seedlings in these fractions without the roots. The design in all the experiments was completely randomized, in a 2x2 factorial arrangement (length x seed visible germination) or 2x4 (seed size x incision type). Fragmented seeds of "uvaieira" shows potential for root and seedling regeneration and can produce more than one seedling per seed. Germination starts inhibition processes of formation of new roots and plantlets, and the incision of cotyledons can block this inhibition.

show abstract

“…The major contribution of vines to the community structure of the understory in Itaberá is related to the greater abundance of deciduous trees in the canopy at that location (Ribeiro et al 2013), which results in different conditions of light within the forest, a true environmental mosaic not only for tree regeneration but also for the resident community of the understory (Souza et al 2010;. Given these apparent advantages, Villagra & Romaniuc-Neto (2010) showed that even a small vegetation fragment, such as that evaluated in Itaberá, can harbor the same vine species richness as do large areas of contiguous forest.…”

Section: Discussionmentioning

confidence: 99%

“…The spatial and temporal structure of the forest understory is related not only to abiotic factors, such as light and soil gradients (Meira-Neto and Martins 2003;Rigon et al 2011), but also to biotic factors, such as the successional stage of the forest (Rigon et al 2011) and the influence of canopy species. The findings of Souza et al (2010; indicate that there are plant-plant interactions between canopy and understory species, primarily related to changes in light regimes, to seed dispersal capacity and to allelopathic processes. The authors suggested that canopy species act as "ecological filters", determining, at least in part, the structure and richness of the tree-shrub community in the understory.…”

Section: Introductionmentioning

confidence: 99%

Structure of the understory community in four stretches of Araucaria forest in the state of São Paulo, Brazil

et al. 2014

View full text Add to dashboard Cite

We analyzed the structure of the understory community in the Atlantic Forest sensu lato, for which phytosociological descriptions of the understory are lacking. We delineated 50 plots of 10 × 20 m each at four sites within an Araucaria forest (a subtype of Atlantic Forest), located in the municipalities of Bananal, Campos do Jordão, Itaberá and Barra do Chapéu, all of which are in the state of São Paulo, Brazil. To sample the resident species of the understory, we randomly selected five 1 × 1 m subplots within each plot, resulting in a total sampling area of 250 m 2 at each site. We identified differences among the locations, mostly due to proportional differences in growth forms, in terms of species richness and the importance values within the community. Factors potentially influencing the understory structure include macroclimatic and microclimatic conditions, as well as forest fragmentation, the abundance of deciduous trees in the canopy, the surrounding vegetation and geographic location.

show abstract

Allelopathic potential of bark and leaves of Esenbeckia leiocarpa Engl. (Rutaceae)

Cited by 21 publications

References 27 publications

Allelopathic effects of Sonchus oleraceus L. on the germination and seedling growth of crop and weed species

Allelopathic effects of Sonchus oleraceus L. on the germination and seedling growth of crop and weed species

Potencial de inibição da regeneração de raízes e plântulas em sementes germinantes de Eugenia pyriformis

Structure of the understory community in four stretches of Araucaria forest in the state of São Paulo, Brazil

Contact Info

Product

Resources

About