Atividade alelopática dos lixiviados de Asemeia extraaxillaris (Polygalaceae) sobre o crescimento de Ipomoea cordifolia

Abstract

RESUMO:O objetivo desse trabalho foi avaliar a atividade alelopática dos lixiviados das raízes e folhas secas de Asemeia extraaxillaris sobre o crescimento de corda de viola Ipomoea cordifolia em casa de vegetação, para avaliação dos efeitos sobre o estresse oxidativo. Nos bioensaios foram utilizadas três concentrações (0,25 -5,00 e 10,00 g) e um controle, com quatro repetições de 10 plantas, cultivadas em solo durante 30 dias. Os lixiviados possuem ação alelopática e o maior efeito foi verificado para o pó das raizes. O efeito inibitório foi dose-dependente e o aumento do estresse oxidativo foi observado pelos níveis da catalase, peroxidase, superóxido dismutase, glutationa redutase, peroxidação lipídica e síntese de formazan. Concluiu-se que A. extraaxillaris possui substâncias capazes de afetar a emergência, o crescimento e o estresse oxidativo de I. cordifolia.Palavras chave: estresse oxidativo, lixiviação, fitoherbicida, mentol-do-campo, corda-de-viola.ABSTRACT: Allelopathic activity of leachates from Asemeia extraaxillaris (Polygalaceae) on the growth of Ipomoea cordifolia. The purpose of this article is to assess the allelopathic activity of leachates from the roots and dried leaves of Asemeia extraaxillaris on the germination and growth of corda de viola (Ipomoea cordifolia) in a greenhouse, and evaluate its effect on oxidative stress. For the bioassays, three concentrations (0.25, 5.00, and 10.00 g) and one control were used, with four replications of 10 plants, cultivated in soil for 30 days. The leachates exhibited allelopathic action, and the greatest effect was found in the root powder. The inhibitory effect was dose-dependent and the increase in oxidative stress was observed by the levels of catalase, peroxidase, superoxide dismutase, glutathione reductase, lipid peroxidation, and formazan synthesis. It was affirmed that A. extraaxillaris contains substances capable of affecting seedling emergence, growth, and oxidative stress in I. cordifolia.

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“…Likewise, Araújo et al (2010) reported that crotalaria extract also delayed the germination of I. grandifolia. Additionally, Silva et al (2016) reported that leachate from A. extraaxillaris delayed the emergence of I. cordifolia.…”

“…Studies have shown that the aqueous extract of the leaves of Eucalyptus grandis W. Hill ex Maiden promote the inhibition and reduction of the germination of I. purpurea seeds (Silva et al, 2015b). Silva et al (2016) described the antagonism of leachate from Asemeia extraaxillaris (Chodat) J.F.B. Pastore & J.R. Abbott on the growth of I. cordifolia.…”

Allelopathic Potential of Aqueous Extract of Leaf and Root Sesame on Sicklepod and Brachiaria Seeds

“…Allelopathic sesame (Sesamum indicum L.) extracts demonstrated an efficient action in the development of black prick seedlings and reduced the germination percentage of this weed from 80% to 28% in relation to the control (PEREIRA, 2007). Although research has shown the effectiveness of using allelopathic substances on weeds (SILVA et al, 2016;ESPINOSA et al, 2019;RIBEIRO et al, 2019), there are few literary references on the use of plant extracts to control sicklepod, requiring further research in this area (SOUZA FILHO et al, 2003).Thus, this study aimed to verify the aqueous extracts allelopathic potential of sesame leaves and roots (Sesamum indicum L.) in germination and development of sicklepod (Senna occidentalis L.) and brachiaria (Urochloa brizantha) seedlings.…”

Germination of five weed species of Convolvulaceae family under the effect of temperature

“…These species have successive fluxes of germination, concentrated on the spring and summer months, possibly due to dormancy that is considered a fundamental strategy for seed survival in soils for long periods of time (PAZUCH et al, 2015;SILVA et al, 2016). Thus, one of the major limita-1 Syngenta Proteção de Cultivos, Gerente de Desenvolvimento de Produtos.…”