Phytotoxic
Mostrando 25-36 de 109 artigos, teses e dissertações.
-
25. Phytotoxicity of organic extracts of Turnera ulmifolia L. and Turnera diffusa Willd. ex Schult. in cucumber seeds
We evaluated the phytotoxic effects that the hexane, ethyl acetate and methanol extracts from leaves and branches of the species Turnera ulmifolia L. and Turnera diffusa Willd. ex Schult. (Turneraceae), at concentrations of 1.25, 2.50, 3.75 and 5.00 mg ml-1, have on seed germination and seedling development in cucumber (Cucumis sativus L.). None of the extra
Acta Bot. Bras.. Publicado em: 2013-09
-
26. Synthesis and phytotoxic activity of 1,2,3-triazole derivatives
Uma série de treze derivados triazólicos contendo grupos benzila-halogenados foi sintetizada utilizando-se como etapa chave a cicloadição azida-alcino catalisada por Cu(I) (CuAAC), transformação comumente descrita como reação click. A atividade biológica destes compostos foi avaliada, e verificou-se que estes compostos interferem na germinação e n
J. Braz. Chem. Soc.. Publicado em: 2013-06
-
27. Phytotoxic activity of crude aqueous extracts and fractions of young leaves of Sapindus saponaria L. (Sapindaceae)
The aim of this study was to evaluate the phytotoxic potential of aqueous extract of young leaves of Sapindus saponaria L. (soapberry) on the diaspore germination and seedling growth Lactuca sativa L. (lettuce) and Allium cepa L. (onion), as well as to determine, by bioassay-guided fractioning, whether the fractionated extracts of those leaves are phytotoxic
Acta Bot. Bras.. Publicado em: 2013-03
-
28. Chemical characterization by GC-MS and phytotoxic potential of non-polar and polar fractions of seeds of Dioteryx odorata (Aubl.) Willd. from Venezuelan regions
Dipteryx odorata (Aubl.) Willd. is a tall arboreal species native to Central and Northern South America. This paper describes the chemical characterization and phytotoxic potential of polar and non-polar extracts from D. odorata seeds. Structural determinations were accomplished by chemical derivatization and analyzed by GC/MS. The chemical composition of th
Quím. Nova. Publicado em: 2013
-
29. Phytotoxic effects of metabolites from Alternaria euphorbiicola against its host plant Euphorbia heterophylla
A bioassay-guided fractionation of culture filtrates of the fungus Alternaria euphorbiicola, a pathogen of the weed Euphorbia heterophylla, led to the isolation of anhydromevalonolactone (1), tyrosol (2), (R)-( - )-mevalonolactone (3), and cycloglycylproline (4). When tested on the punctured leaves of the host plant, these compounds produced bleached lesions
Quím. Nova. Publicado em: 2013
-
30. Changes in the accumulation of shikimic acid in mycorrhized Capsicum annuum L. grown with application of glyphosate and phosphorus
When glyphosate is added to the soil, it is absorbed by roots and transported by xylem causing growth inhibition in plants. Mycorrhiza is the beneficial association between roots of most plants and soil fungi. The methylphosphonic group of the glyphosate could compete with inorganic phosphates for sorption sites in the soil. The aim of this work was to study
Theor. Exp. Plant Physiol.. Publicado em: 2013
-
31. DESEMPENHO DE UMA SEMEADORA-ADUBADORA E MÉTODOS DE APLICAÇÃO DE INSETICIDAS NO SULCO EM PLANTIO DIRETO / PERFORMANCE OF A PLANTER AND EFFICIENCY OF INSECTICIDES APPLIED IN THE GROOVE OF SEEDING TILLAGE
No-tillage was only possible with the development of machines to work on specific seeding soils with straw on the surface, equipped with a plow blade and to facilitate the deposition of seed in the soil depths in uniform and with reduced tillage in furrow, in conditions conducive to germination / seedling emergence and root growth good for the crop. However,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/03/2011
-
32. Síntese e avaliação da atividade fitotóxica de compostos heteroaromáticos análogos aos nostoclídeos / Synthesis and phytotoxic activity evaluation of heteroaromatic nostoclide analogues
Os nostoclídeos I e II foram isolados de uma alga verde-azul Nostoc sp, presente no líquen Peltigera canina. Estes compostos são estruturalmente semelhantes à cianobacterina que possui atividade fitotóxica, inibindo o transporte de elétrons no fotossistema II da fotossíntese. Alguns compostos análogos aos nostoclídeos também possuem atividade fitot
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/02/2011
-
33. Data collection and advanced statistical analysis in phytotoxic activity of aerial parts exudates of Salvia spp
In order to define the phytotoxic potential of Salvia species a database was developed for fast and efficient data collection in screening studies of the inhibitory activity of Salvia exudates on the germination of Papaver rhoeas L. and Avena sativa L.. The structure of the database is associated with the use of algorithms for calculating the usual germinati
Revista Brasileira de Farmacognosia. Publicado em: 12/08/2011
-
34. Actividad fitotóxica de un extracto N-Hexano obtenido de la corteza de Drimys Winteri sobre cuatro especies de malezas
The objective of this research was to determine the phytotoxic effect of the n-hexane extract obtained from the bark of Drimys winteri on germination and growth of Convolvulus arvensis, Setaria pumila, Daucus carota and Cichorium intybus. The phytotoxic effects of the extract on the germination of weeds were determined by bioassays in Petri dishes, adding th
Planta Daninha. Publicado em: 2011-06
-
35. Disponibilidade de micronutrientes em classes dominantes de solos do Trópico Úmido brasileiro. II. Manganês.
1984
Belém. Publicado em: 2011
-
36. Hyptis fruticosa Salzm. ex Benth. (Lamiaceae): caracterização botânica, química, avaliações ecofisiológicas e atividades farmacológicas. / Hyptis fruticosa Salzm. ex Benth. (Lamiaceae): characterization botany, chemistry, ecophysiological assessments and pharmacological activities.
Hyptis fruticosa Salzm. ex Benth. (Alecrim do campo) is an aromatic plant widely used in folk medicine due to its therapeutic properties. Therefore the aim of this work was to undertake botanical, chemical, ecophysiological, and pharmacological studies. The botanical investigations observed and analyzed information about morphological, physiological, and env
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/09/2010