Efeitos alelopáticos de extratos vegetais de Hancornia speciosa, Gomes na
            germinação de Lactuca sativa L.

Uhlmann, Lidiane Andressa Cavalcante; Oliveira, Rafael José de; Santos, Márcio Galdino dos

doi:10.5935/2446-4775.20180014

Cited by 5 publications

(3 citation statements)

References 41 publications

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“…While H. speciosa seems to interact negatively with the neighbourhood occupation, H. obovatus seems to interact positively. The contrasting effects of these target species in the associated plant community were inferred from field observations and supported through laboratory tests on allelopathy (Gonçalves, 2016, Uhlmann et al 2018). More recently, the number of rare species surrounding these trees also supported their opposite influence on the selectivity of coexisting species.…”

Section: Introductionmentioning

confidence: 92%

The effect of tree-on-tree interactions and abiotic conditions on woody communities in Brazilian savannas

et al. 2023

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Fire plays a crucial role in shaping plant communities in South American savannas. However, the impact of biotic interactions on tree communities still needs to be better explored. In this study, we evaluated the influence of tree-on-tree interactions and abiotic conditions on the structure and diversity of woody communities in savannas of Central Brazil. We used plots of 10 × 10 m in three preservation areas of savanna to assess the abundance and composition of juveniles and adults in woody communities associated with two Apocynaceae tree species: Hancornia speciosa, postulated to show negative interactions with the associated tree community, and Himatanthus obovatus, postulated to show positive interactions. Our results revealed that while abiotic factors, represented by the altitude, are more critical in shaping the community of juvenile trees, tree-on-tree interactions have a stronger influence on adult tree populations, driving community dynamics during plant recruitment. Specifically, Hancornia speciosa reduces the abundance of adults, whereas Himatanthus obovatus enhances their relative abundance; both shape the composition of tree communities. Consequently, tree-on-tree interactions create distinct mosaics at various stages of regeneration, contributing to savanna dynamics and conservation.

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Section: Introductionmentioning

confidence: 92%

The effect of tree-on-tree interactions and abiotic conditions on woody communities in Brazilian savannas

et al. 2023

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“…As análises estatísticas foram realizadas no programa R v. 4.0.1 (R Core Team, 2020 L. sativa é uma espécie reconhecidamente sensível à diferentes substâncias nocivas (Brasil, 2009) e, por isso, amplamente utilizada em estudos que visam identificar a presença destas substâncias em extratos de plantas e seus efeitos fisiológicos, permitindo a observação de ausência de efeito alelopático (Carvalho et al, 2014;Souto et al, 2015), de efeitos alelopático positivo (Silva et al, 2019) ou ainda, efeitos alelopáticos negativos (Novais et al, 2017;Silva, E. et al, 2018), como observado neste estudo A germinação e o IVG de sementes de L. sativa sofreram inibição em razão do aumento das concentrações de EAD de Z. officinale, sendo que, a partir de 100 mg mL -1 , essa redução diferiu significativamente do CN (Tabela 1). O efeito inibitório no PG e/ou IVG de L. sativa em função das concentrações também foi observada em estudos que avaliaram o potencial fitotóxico de extratos aquosos de Mikania laevigata (Santos & Gonçalves, 2020), de Hancornia speciosa (Uhlmann et al, 2018). de Mimosa pudica (Santos et al, 2018) e de Persea americana (Oliveira et al, 2018).…”

Section: Avaliação Dos Bioensaiosunclassified

Atividade alelopática de Zingiber officinale Roscoe na germinação e desenvolvimento inicial de Bidens pilosa e Lactuca sativa L.

Cardoso

Rossi

Pedri

et al. 2022

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Metabólitos secundários atuam como mecanismos de defesa de espécies vegetais, na adaptação ao meio, nos processos de polinização e dispersão de sementes, sendo também estudados e explorados para a produção de fitoterápicos e, em um cenário contemporâneo, para produção de bioherbicidas ou biofertilizantes. Nesse contexto, este estudo objetivou avaliar o potencial alelopático de Zingiber officinale Roscoe sobre a germinação, emergência e desenvolvimento inicial de plântulas de Bidens pilosa e Lactuca sativa em dois ambientes distintos: câmara de germinação (CGer) e em casa de vegetação (CVeg). Foram testadas quatro concentrações (50, 100, 200 e 400 mg mL-1) de extrato aquoso obtido por decocção (EAD) de frações do rizoma de Z. officinale, utilizando água destilada como controle negativo (0 mg mL-1). Os bioensaios foram mantidos por um período de sete (CGer) e 11 dias (CVeg), sendo realizadas contagens diárias para detecção de interferências na germinação, emergência e desenvolvimento inicial das plântulas das espécies receptoras. Ambos os bioensaios apontaram efeito alelopático negativo do EAD de Z. officinale, sendo que a espécie L. sativa apresentou-se mais sensível aos aleloquímicos, tanto em CGer quanto em CVeg, apresentado IC50 de 194,76 e 93,31 mg mL-1, respectivamente. B. pilosa, por sua vez, sofreu efeito alelopático positivo sobre o CPA e CSR quando exposta à concentração 100 mg mL-1. Considerando os resultados obtidos, não se recomenda a utilização, como bioherbicida ou biofertilizante, de EAD de rizoma de Z. officinale, nas concentrações avaliadas, para as espécies B. pilosa e L. sativa, respectivamente.

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“…The delay in the germination period represents a competitive disadvantage for the individuals in the field, as they will be submitted to a longer period of exposure to pathogens, abiotic stress and predators. The prolongation in the germination time determines competitive losses with pre-established plants in growth, making them more susceptible (Uhlmann et al, 2018).…”

Section: Phytotoxicity Assaymentioning

confidence: 99%

Phytotoxic and cyto-genotoxic activity of essential oil from leaf residues of Eucalyptus urophylla and the hybrid E. urophylla x E. camaldulensis on Lactuca sativa and Sorghum bicolor

Alves

Henrique

Azevedo

et al. 2021

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The use of agrochemicals has influenced the increase in agricultural productivity. However, the concern about damage to the human health and to the environment, resulting from the indiscriminate use of pesticides, has increased worldwide. Alternative methods for controlling pests and diseases have been proposed to maintain productivity and quality of life. A possibility is to use compounds produced by the secondary metabolism of plants, such as the essential oils. Some of these substances perform inhibitory or stimulatory activity on the development of other organisms. Plants from the genus Eucalyptus have been investigated and were chosen to be studied in the present work, due to the traditional knowledge regarding the potential of the essential oils from some species, as well as, for the need to use residues from their production. Therefore, were determined the yield, identified the compounds from the essential oils of E. urophylla and the hybrid E. urophylla x E. camaldulensis, and evaluated their biological activity through bioassays, investigating the phyto-cyto-genotoxicity and mutagenicity using Lactuca sativa and Sorghum bicolor as model plants. The essential oil from the hybrid provided a higher yield. Eucalyptol was the major compound identified for both oils, representing more than 85% of the compounds present. Both E. urophylla and the hybrid showed phyto-cyto-genotoxic, mutagenic effects, and clastogenic and aneugenic mechanisms of action, promoting epigenetic changes in the meristematic cells of L. sativa. The results point out to the bioherbicidal potential of these essential oils.

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Efeitos alelopáticos de extratos vegetais de Hancornia speciosa, Gomes na germinação de Lactuca sativa L.

Cited by 5 publications

References 41 publications

The effect of tree-on-tree interactions and abiotic conditions on woody communities in Brazilian savannas

The effect of tree-on-tree interactions and abiotic conditions on woody communities in Brazilian savannas

Atividade alelopática de Zingiber officinale Roscoe na germinação e desenvolvimento inicial de Bidens pilosa e Lactuca sativa L.

Phytotoxic and cyto-genotoxic activity of essential oil from leaf residues of Eucalyptus urophylla and the hybrid E. urophylla x E. camaldulensis on Lactuca sativa and Sorghum bicolor

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