Allelopathic effects of aqueous extracts of Artistolochia esperanzae O.Kuntze on development of Sesamum indicum L. seedlings

Gatti, Ana Beatriz; Ferreira, Alfredo Guí; Arduin, Marcos; Perez, Sonia Cristina Gualtieri de Andrade

doi:10.1590/s0102-33062010000200016

Cited by 55 publications

(38 citation statements)

References 31 publications

(21 reference statements)

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“…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.

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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.

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Section: Resultsunclassified

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

Amador

Barbedo

2011

Pesq. agropec. bras.

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“…The primary roots were placed in a solution of 70% ethanol and incubated at 40 °C for seven days. Next, the roots were washed with distilled water and treated with a 25% NaOH solution for 2 days at 40 °C for clarification of the biological material (Gatti et al, 2010). Then, the roots were washed with distilled water and treated with a solution of Lacmóide for 24 hours at room temperature.…”

Section: Metaxylem Cell Growth Biossaymentioning

confidence: 99%

Phytotoxic potential of young leaves from Blepharocalyx salicifolius (Kunth) O. Berg (Myrtaceae)

et al. 2016

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The loss of leaves by plant species found in the Cerrado (Brazilian savanna) is an energetically expensive process due to adverse environmental conditions and predation by herbivory. The mature leaves have adaptations which minimize these events. However, the young individuals lack these structures and produce high leaf concentrations of secondary metabolites as a form of protection. These compounds can be used in bioprospection of natural herbicides. Thus, this study aimed to evaluate the phytotoxicity of hexane, ethyl acetate and aqueous extracts of young leaves from Blepharocalyx salicifolius (Kunth) O. Berg on the elongation of wheat coleoptiles (Triticum aestivum L.) and evaluate the potential phytotoxic of ethyl acetate extract on germination, growth and cell size of metaxylem of sesame (Sesamum indicum L.) seedlings. The hexane and ethyl acetate extracts inhibited the elongation of wheat coleoptiles at all concentrations; however, the most promising results were observed in coleoptile fragments treated with the ethyl acetate extract. This treatment changed the mean germination time and the synchrony of sesame seeds, inhibited the growth of shoots and roots, reduced the dry weight of seedlings, led to abnormalities in the seedlings and reduced the length of the metaxylem cells in the sesame seedlings. These results demonstrated the phytotoxic potential of young leaf extracts of B. salicifolius and the high phytotoxicity of the ethyl acetate extract in the initial development of S. indicum.Keywords: Triticum aestivum, Sesamum indicum, murta, allelopathy, bioactivity. Potencial fitotóxico de folhas jovens de

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“…Th is solution was stored at ≈ 5°C for 12 h. Th e extract was then fi ltered by suction through a Buchner funnel covered with fi lter paper (Gatti et al 2010).…”

Section: Preparation Of Plant Extractsmentioning

confidence: 99%

Interspecific variation in the allelopathic potential of the family Myrtaceae

2013

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Allelopathy is a type of biotic interference wherein a plant releases bioactive metabolites into an environment, thereby aff ecting the adjacent biota. Stressful environments stimulate the production of these metabolites. Th e present study tests the novel weapons hypothesis, which postulates that species belonging to the same genus and from the same environment have similar allelopathic eff ects. Th e aim of this study was to assess the allelopathic eff ects that the aqueous leaf extracts of 15 species belonging to fi ve genera of the Myrtaceae family have on the seed germination and initial seedling growth of lettuce (Lactuca sativa L.), tomato (Solanum lycopersicum L.) and onion (Allium cepa L.). Germination rates, average germination times, informational entropy of germination and allelopathic eff ects, as quantifi ed with a response index, were calculated. A taxonomic distance matrix based on Gower dissimilarity and a Euclidean distance matrix were constructed. Th e results revealed that all extracts from donor species signifi cantly increased average germination time or reduced the germination rate of eudicotyledonous plant species. Th e only extracts that showed no eff ect on monocotyledonous seeds were those of Campomanesia pubescens O. Berg and Psidium cinereum Mart. We conclude that eudicotyledonous and monocotyledonous plants were both signifi cantly aff ected by the presence of all extracts tested. Our results make it clear that each species behaves distinctly in relation to allelopathic activity, with no apparent grouping by genus or subtribe. Th erefore, the hypothesis was rejected, because plants from the same environment and with taxonomic proximity do not necessarily display similar production of secondary metabolites.

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Allelopathic effects of aqueous extracts of Artistolochia esperanzae O.Kuntze on development of Sesamum indicum L. seedlings

Cited by 55 publications

References 31 publications

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

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

Phytotoxic potential of young leaves from Blepharocalyx salicifolius (Kunth) O. Berg (Myrtaceae)

Interspecific variation in the allelopathic potential of the family Myrtaceae

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