Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.100.244 [Categoria DeCS]
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[PMID]:28700644
[Au] Autor:Moretti ML; Alárcon-Reverte R; Pearce S; Morran S; Hanson BD
[Ad] Endereço:Department of Plant Sciences, University of California, Davis, California, United States of America.
[Ti] Título:Transcription of putative tonoplast transporters in response to glyphosate and paraquat stress in Conyza bonariensis and Conyza canadensis and selection of reference genes for qRT-PCR.
[So] Source:PLoS One;12(7):e0180794, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Herbicide resistance is a challenge for modern agriculture further complicated by cases of resistance to multiple herbicides. Conyza bonariensis and Conyza canadensis are invasive weeds of field crops, orchards, and non-cropped areas in many parts of the world. In California, USA, Conyza populations resistant to the herbicides glyphosate and paraquat have recently been described. Although the mechanism conferring resistance to glyphosate and paraquat in these species was not elucidated, reduced translocation of these herbicides was observed under experimental conditions in both species. Glyphosate and paraquat resistance associated with reduced translocation are hypothesized to be a result of sequestration of herbicides into the vacuole, with the possible involvement of over-expression of genes encoding tonoplast transporters of ABC-transporter families in cases of glyphosate resistance or cationic amino acid transporters (CAT) in cases of paraquat resistance. However, gene expression in response to herbicide treatment has not been studied in glyphosate and paraquat resistant populations. In the current study, we evaluated the transcript levels of genes possibly involved in resistance using real-time PCR. First, we evaluated eight candidate reference genes following herbicide treatment and selected three genes that exhibited stable expression profiles; ACTIN, HEAT-SHOCK-PROTEIN-70, and CYCLOPHILIN. The reference genes identified here can be used for further studies related to plant-herbicide interactions. We used these reference genes to assay the transcript levels of EPSPS, ABC transporters, and CAT in response to herbicide treatment in susceptible and resistant Conyza spp. lines. No transcription changes were observed in EPSPS or CAT genes after glyphosate or paraquat treatment, suggesting that these genes are not involved in the resistance mechanism. Transcription of the two ABC transporter genes increased following glyphosate treatment in all Conyza spp. lines. Transcription of ABC transporters also increased after paraquat treatment in all three lines of C. bonariensis. However, in C. canadensis, paraquat treatment increased transcription of only one ABC transporter gene in the susceptible line. The increase in transcription of ABC transporters after herbicide treatment is likely a stress response based on similar response observed across all Conyza lines regardless of resistance or sensitivity to glyphosate or paraquat, thus these genes do not appear to be directly involved in the mechanism of resistance in Conyza spp.
[Mh] Termos MeSH primário: Conyza/efeitos dos fármacos
Conyza/metabolismo
Glicina/análogos & derivados
Paraquat/farmacologia
[Mh] Termos MeSH secundário: Actinas/genética
Actinas/metabolismo
Sistemas de Transporte de Aminoácidos Básicos/genética
Sistemas de Transporte de Aminoácidos Básicos/metabolismo
Conyza/genética
Ciclofilinas/genética
Ciclofilinas/metabolismo
Glicina/farmacologia
Proteínas de Choque Térmico HSP70/genética
Proteínas de Choque Térmico HSP70/metabolismo
Proteínas de Plantas/genética
Proteínas de Plantas/metabolismo
Reação em Cadeia da Polimerase em Tempo Real
Reação em Cadeia da Polimerase Via Transcriptase Reversa
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Actins); 0 (Amino Acid Transport Systems, Basic); 0 (HSP70 Heat-Shock Proteins); 0 (Plant Proteins); 4632WW1X5A (glyphosate); EC 5.2.1.- (Cyclophilins); PLG39H7695 (Paraquat); TE7660XO1C (Glycine)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170925
[Lr] Data última revisão:
170925
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170713
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0180794


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[PMID]:27979664
[Au] Autor:Ma L; Liu H; Qin P; Hu C; Man S; Li Y; Liu Z; Liu Z; Diao A
[Ad] Endereço:Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, School of Biotechnology, Tianjin University of Science & Technology, Tianjin, 300457, China; Tianjin Key Laboratory of Industry Microbiology, School of Biotechnology, Tianjin University of Science & Technology, Ti
[Ti] Título:Saponin fraction isolated from Conyza blinii H.Lév. demonstrates strong anti-cancer activity that is due to its NF-κB inhibition.
[So] Source:Biochem Biophys Res Commun;483(1):779-785, 2017 Jan 29.
[Is] ISSN:1090-2104
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:CBS (Conyza blinii saponin) is the total triterpenoidal saponins of Conyza blinii H.Lév which is a type of traditional Chinese medicine (TCM). We have discovered that CBS has a profound cytostatic activity against a range of solid tumour cells in a time- and dose-dependent manner. We also confirm that the cytostatic activity of CBS originates from its apoptosis induction effect. Additionally, we use immunoblot to find out that the apoptosis induction effect of CBS is attributable to the activation of mitochondrial pathway. Mechanistic study demonstrates that CBS is an effective NF-κB inhibitor. It inhibits p65 nuclear translocation and NF-κB downstream gene expression, including XIAP, survivin, Bcl-xL, COX-2, cyclin D1, MMP-2, MMP-9 in HeLa cells. Tumour xenografted animal models verify the anti-cancer efficacy in vivo. Tumour growth is significantly repressed in two CBS-treated groups compared with the controls (P < 0.001). CBS treatment (i.g.) leads to a 48.5% and 57.0% reduction in terms of tumour weight for the 10 and 20 mg/kg dosed groups respectively. Also no apparent observable adverse effects can be seen. These results suggest that CBS obliterate tumour, at least in part due to its NF-κB inhibition, which creates potential for CBS to be developed as a practical cancer treatment.
[Mh] Termos MeSH primário: Antineoplásicos/farmacologia
Conyza/química
Medicamentos de Ervas Chinesas/farmacologia
NF-kappa B/antagonistas & inibidores
Saponinas/farmacologia
[Mh] Termos MeSH secundário: Antineoplásicos/química
Antineoplásicos/isolamento & purificação
Linhagem Celular Tumoral
Fracionamento Químico
Medicamentos de Ervas Chinesas/química
Medicamentos de Ervas Chinesas/isolamento & purificação
Seres Humanos
Medicina Tradicional Chinesa
NF-kappa B/metabolismo
Transporte Proteico/efeitos dos fármacos
Saponinas/química
Saponinas/isolamento & purificação
Ensaios Antitumorais Modelo de Xenoenxerto
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antineoplastic Agents); 0 (Drugs, Chinese Herbal); 0 (NF-kappa B); 0 (Saponins)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170529
[Lr] Data última revisão:
170529
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161217
[St] Status:MEDLINE


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[PMID]:27098558
[Au] Autor:Kleinman Z; Rubin B
[Ad] Endereço:Robert H Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Rehovot, Israel.
[Ti] Título:Non-target-site glyphosate resistance in Conyza bonariensis is based on modified subcellular distribution of the herbicide.
[So] Source:Pest Manag Sci;73(1):246-253, 2017 Jan.
[Is] ISSN:1526-4998
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Conyza spp. were the first broadleaf weeds reported to have evolved glyphosate resistance. Several mechanisms have been proposed for glyphosate resistance. In an effort to elucidate the mechanism of this resistance in Conyza bonariensis, possible target-site and non-target-site mechanisms were investigated in glyphosate-resistant (GR) C. bonariensis biotypes. RESULTS: Using differential glyphosate applications and analyses of shikimate accumulation, we followed the herbicide effect in different plant organs and monitored the herbicide's apparent mobility. We found high shikimate levels in the roots and young leaves of glyphosate-sensitive (GS) plants, regardless of the site of application, whereas in GR plants, shikimate accumulated mainly in treated young leaves. C-glyphosate studies, however, revealed the expected source-to-sink translocation pattern in both GS and GR plants. Sequencing of the appropriate EPSPS DNA fragments of GR and GS plants revealed no alteration at the Pro106 position. CONCLUSION: These data support the hypothesis that the glyphosate resistance of our C. bonariensis GR biotypes is associated with altered subcellular distribution of glyphosate, which keeps the herbicide sequestered away from the EPSPS target site in the chloroplast. © 2016 Society of Chemical Industry.
[Mh] Termos MeSH primário: 3-Fosfoshikimato 1-Carboxiviniltransferase/fisiologia
Conyza/efeitos dos fármacos
Glicina/análogos & derivados
Resistência a Herbicidas/genética
Herbicidas/farmacologia
[Mh] Termos MeSH secundário: 3-Fosfoshikimato 1-Carboxiviniltransferase/genética
3-Fosfoshikimato 1-Carboxiviniltransferase/metabolismo
Conyza/genética
Glicina/metabolismo
Glicina/farmacologia
Herbicidas/metabolismo
Análise de Sequência de Proteína
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Herbicides); 4632WW1X5A (glyphosate); EC 2.5.1.19 (3-Phosphoshikimate 1-Carboxyvinyltransferase); TE7660XO1C (Glycine)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170306
[Lr] Data última revisão:
170306
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160422
[St] Status:MEDLINE
[do] DOI:10.1002/ps.4293


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[PMID]:27798798
[Au] Autor:Bajwa AA; Sadia S; Ali HH; Jabran K; Peerzada AM; Chauhan BS
[Ad] Endereço:School of Agriculture and Food Sciences, The University of Queensland, Gatton, QLD, 4343, Australia. a.bajwa@uq.qdu.au.
[Ti] Título:Biology and management of two important Conyza weeds: a global review.
[So] Source:Environ Sci Pollut Res Int;23(24):24694-24710, 2016 Dec.
[Is] ISSN:1614-7499
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Weed management is one of the prime concerns for sustainable crop production. Conyza bonariensis and Conyza canadensis are two of the most problematic, noxious, invasive and widespread weeds in modern-day agriculture. The biology, ecology and interference of C. bonariensis and C. canadensis have been reviewed here to highlight pragmatic management options. Both these species share a unique set of biological features, which enables them to invade and adapt a wide range of environmental conditions. Distinct reproductive biology and an efficient seed dispersal mechanism help these species to spread rapidly. Ability to interfere strongly and to host crop pests makes these two species worst weeds of cropping systems. These weed species cause 28-68 % yield loss in important field crops such as soybean and cotton every year. These weeds are more prevalent in no-till systems and, thus, becoming a major issue in conservation agriculture. Cultural practices such as crop rotations, seed rate manipulation, mulching, inter-row tillage and narrow row spacing may provide an effective control of these species. However, such methods are not feasible and applicable under all types of conditions. Different herbicides also provide a varying degree of control depending on crop, agronomic practices, herbicide dose, application time and season. However, both these species have evolved resistance against multiple herbicides, including glyphosate and paraquat. The use of alternative herbicides and integrated management strategies may provide better control of herbicide-resistant C. bonariensis and C. canadensis. Management plans based on the eco-biological interactions of these species may prove sustainable in the future.
[Mh] Termos MeSH primário: Conyza/efeitos dos fármacos
Conyza/fisiologia
Herbicidas/farmacologia
Plantas Daninhas/efeitos dos fármacos
Controle de Plantas Daninhas/métodos
[Mh] Termos MeSH secundário: Resistência a Herbicidas
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Herbicides)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:171121
[Lr] Data última revisão:
171121
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161101
[St] Status:MEDLINE
[do] DOI:10.1007/s11356-016-7794-7


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[PMID]:27768529
[Au] Autor:Contiero RL; Biffe DF; Constantin J; de Oliveira RS; Braz GB; Lucio FR; Schleier JJ
[Ad] Endereço:a Agronomy Department , Universidade Estadual de Maringá , Maringá, Paraná , Brazil.
[Ti] Título:Effects of nozzle types and 2,4-D formulations on spray deposition.
[So] Source:J Environ Sci Health B;51(12):888-893, 2016 Dec.
[Is] ISSN:1532-4109
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The objective of this study was to evaluate the effects of nozzle types and 2,4-D formulations on spray deposition on different targets. Two field experiments were carried out in a completely randomized design, and treatments were arranged in a factorial scheme. Species in experiment 1 were Sumatran fleabane (Conyza sumatrensis) and Brazil pusley (Richardia brasiliensis) and in experiment 2 were soybeans (Glycine max) and Benghal dayflower (Commelina benghalensis). For both experiments, the first factor corresponded to spray nozzles with different settings (AD 110.015 - 61 and 105 L ha ; AD 015-D - 75 and 146 L ha ; XR 110.0202 - 200 L ha ; and ADIA-D 110.02 - 208 L ha ) and the second factor consisted of two formulations of 2,4-D (amine and choline). The formulation of 2,4-D choline has contained Colex-D™ Technology. Similar or higher spray deposition was observed on the leaves and artificial targets when using 2,4-D choline as compared to the 2,4-D amine formulation, and these differences in deposition were more evident for nozzles applying lower spray volumes. Deposition was more affected by nozzle type when amine formulation was used, compared to choline formulation.
[Mh] Termos MeSH primário: Ácido 2,4-Diclorofenoxiacético/administração & dosagem
Agricultura/instrumentação
Agricultura/métodos
[Mh] Termos MeSH secundário: Brasil
Commelina
Conyza/efeitos dos fármacos
Dimetilaminas/administração & dosagem
Desenho de Equipamento
Plantas Daninhas/efeitos dos fármacos
Distribuição Aleatória
Feijão de Soja
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Dimethylamines); 2008-39-1 (2,4-D amine); 2577AQ9262 (2,4-Dichlorophenoxyacetic Acid)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161022
[St] Status:MEDLINE


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[PMID]:27567718
[Au] Autor:Duarte LL; Santos FM; Barreto RW
[Ad] Endereço:Departamento de Fitopatologia, Universidade Federal de Viçosa, Minas Gerais 36571-900, Brazil.
[Ti] Título:Mycobiota of the weed Conyza canadensis (Asteraceae) in Brazil.
[So] Source:Fungal Biol;120(9):1118-34, 2016 Sep.
[Is] ISSN:1878-6146
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Conyza canadensis is a noxious and notably problematic weed in Brazil whose control is greatly challenging due to the appearance, in the last years, of herbicide resistant populations. An investigation regarding the associated pathogenic fungi of this plant was conducted in Brazil aimed at starting a biological control program to help mitigate its economic impact. Ten fungal species were yielded and described: two ascomycetes (Leptosphaerulina conyzicola sp. nov. and Wentiomyces melioloides), five hyphomycete asexual morphs (Alternaria tenuissima, Cercospora conyzicola sp. nov., Cercosporella virgaureae, and Fusarium fujikuroi), two coelomycete asexual morphs (Phoma conyzaphthora sp. nov., Septoria erigerontis), one rust fungus (Aecidium conyzicola sp. nov.), and one oomycete (Basidiophora entospora). Four among the fungi that were collected represent new taxa, and the others represented either new host-records of known fungal species or new geographic records or both, except for C. virgaureae that had already been recorded on C. canadensis in Brazil. None of the discovered species have any potential to be used as a mycoherbicide or to be introduced somewhere else, nevertheless, the knowledge about this mycobiota will help guide the selection of potential biocontrol agents to be introduced in Brazil.
[Mh] Termos MeSH primário: Biodiversidade
Conyza/microbiologia
Fungos/classificação
Fungos/isolamento & purificação
Filogenia
Plantas Daninhas/microbiologia
[Mh] Termos MeSH secundário: Brasil
Análise por Conglomerados
DNA Fúngico/química
DNA Fúngico/genética
DNA Ribossômico/química
DNA Ribossômico/genética
DNA Espaçador Ribossômico/química
DNA Espaçador Ribossômico/genética
Complexo IV da Cadeia de Transporte de Elétrons/genética
Genes de RNAr
Fator 2 de Elongação de Peptídeos/genética
RNA Fúngico/genética
RNA Ribossômico/genética
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Fungal); 0 (DNA, Ribosomal); 0 (DNA, Ribosomal Spacer); 0 (Peptide Elongation Factor 2); 0 (RNA, Fungal); 0 (RNA, Ribosomal); 0 (RNA, ribosomal, 26S); EC 1.9.3.1 (Electron Transport Complex IV)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170913
[Lr] Data última revisão:
170913
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160829
[St] Status:MEDLINE


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[PMID]:27104532
[Au] Autor:Tani E; Chachalis D; Travlos IS; Bilalis D
[Ad] Endereço:Laboratory of Plant Breeding, Department of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece. etani@aua.gr.
[Ti] Título:Environmental Conditions Influence Induction of Key ABC-Transporter Genes Affecting Glyphosate Resistance Mechanism in Conyza canadensis.
[So] Source:Int J Mol Sci;17(4), 2016 Apr 20.
[Is] ISSN:1422-0067
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Conyza canadensis has been reported to be the most frequent weed species that evolved resistance to glyphosate in various parts of the world. The objective of the present study was to investigate the effect of environmental conditions (temperature and light) on the expression levels of the EPSPS gene and two major ABC-transporter genes (M10 and M11) on glyphosate susceptible (GS) and glyphosate resistant (GR) horseweed populations, collected from several regions across Greece. Real-time PCR was conducted to determine the expression level of the aforementioned genes when glyphosate was applied at normal (1×; 533 g·a.e.·ha(-1)) and high rates (4×, 8×), measured at an early one day after treatment (DAT) and a later stage (four DAT) of expression. Plants were exposed to light or dark conditions, at three temperature regimes (8, 25, 35 °C). GR plants were made sensitive when exposed to 8 °C with light; those sensitized plants behaved biochemically (shikimate accumulation) and molecularly (expression of EPSPS and ABC-genes) like the GS plants. Results from the current study show the direct link between the environmental conditions and the induction level of the above key genes that likely affect the efficiency of the proposed mechanism of glyphosate resistance.
[Mh] Termos MeSH primário: Transportadores de Cassetes de Ligação de ATP/genética
Conyza/genética
Regulação da Expressão Gênica de Plantas
Glicina/análogos & derivados
Resistência a Herbicidas/genética
Proteínas de Plantas/genética
[Mh] Termos MeSH secundário: Transportadores de Cassetes de Ligação de ATP/metabolismo
Meio Ambiente
Glicina/toxicidade
Grécia
Proteínas de Plantas/metabolismo
Reação em Cadeia da Polimerase em Tempo Real
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Plant Proteins); 4632WW1X5A (glyphosate); TE7660XO1C (Glycine)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160423
[St] Status:MEDLINE


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[PMID]:26733305
[Au] Autor:Li Y; Zhou C; Huang M; Luo J; Hou X; Wu P; Ma X
[Ad] Endereço:College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, China. yingtinghong@163.com.
[Ti] Título:Lead tolerance mechanism in Conyza canadensis: subcellular distribution, ultrastructure, antioxidative defense system, and phytochelatins.
[So] Source:J Plant Res;129(2):251-62, 2016 Mar.
[Is] ISSN:1618-0860
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:We used hydroponic experiments to examine the effects of different concentrations of lead (Pb) on the performance of the Pb-tolerable plant Conyza canadensis. In these experiments, most of the Pb was accumulated in the roots; there was very little Pb accumulated in stems and leaves. C. canadensis is able to take up significant amounts of Pb whilst greatly restricting its transportation to specific parts of the aboveground biomass. High Pb concentrations inhibited plant growth, increased membrane permeability, elevated antioxidant enzyme activity in roots, and caused a significant increase in root H2O2 and malondialdehyde content. Analysis of Pb content at the subcellular level showed that most Pb was associated with the cell wall fraction, followed by the nucleus-rich fraction, and with a minority present in the mitochondrial and soluble fractions. Furthermore, transmission electron microscopy and energy dispersive X-ray analysis of root cells revealed that the cell wall and intercellular space in C. canadensis roots are the main locations of Pb accumulation. Additionally, high Pb concentrations adversely affected the cellular structure of C. canadensis roots. The increased enzyme activity suggests that the antioxidant system may play an important role in eliminating or alleviating Pb toxicity in C. canadensis roots. However, the levels of non-protein sulfhydryl compounds, glutathione, and phytochelatin did not significantly change in either the roots or leaves under Pb-contaminated treatments. Our results provide strong evidence that cell walls restrict Pb uptake into the root and act as an important barrier protecting root cells, while demonstrating that antioxidant enzyme levels are correlated with Pb exposure. These findings demonstrate the roles played by these detoxification mechanisms in supporting Pb tolerance in C. canadensis.
[Mh] Termos MeSH primário: Antioxidantes/metabolismo
Conyza/fisiologia
Chumbo
[Mh] Termos MeSH secundário: Biomassa
Parede Celular/metabolismo
Conyza/efeitos dos fármacos
Conyza/ultraestrutura
Peróxido de Hidrogênio/metabolismo
Hidroponia
Chumbo/metabolismo
Chumbo/toxicidade
Malondialdeído/metabolismo
Especificidade de Órgãos
Estresse Oxidativo
Fitoquelatinas/metabolismo
Folhas de Planta/efeitos dos fármacos
Folhas de Planta/fisiologia
Folhas de Planta/ultraestrutura
Raízes de Plantas/efeitos dos fármacos
Raízes de Plantas/fisiologia
Raízes de Plantas/ultraestrutura
Caules de Planta/efeitos dos fármacos
Caules de Planta/fisiologia
Caules de Planta/ultraestrutura
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Antioxidants); 2P299V784P (Lead); 4Y8F71G49Q (Malondialdehyde); 98726-08-0 (Phytochelatins); BBX060AN9V (Hydrogen Peroxide)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:171014
[Lr] Data última revisão:
171014
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160107
[St] Status:MEDLINE
[do] DOI:10.1007/s10265-015-0776-x


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[PMID]:26646239
[Au] Autor:Alcántara de la Cruz R; Barro F; Domínguez-Valenzuela JA; De Prado R
[Ad] Endereço:Department of Agricultural Chemistry and Edaphology, University of Cordoba, E-14071, Cordoba, Spain. Electronic address: g12alalr@uco.es.
[Ti] Título:Physiological, morphological and biochemical studies of glyphosate tolerance in Mexican Cologania (Cologania broussonetii (Balb.) DC.).
[So] Source:Plant Physiol Biochem;98:72-80, 2016 Jan.
[Is] ISSN:1873-2690
[Cp] País de publicação:France
[La] Idioma:eng
[Ab] Resumo:In recent years, glyphosate-tolerant legumes have been used as cover crops for weed management in tropical areas of Mexico. Mexican cologania (Cologania broussonetii (Balb.) DC.) is an innate glyphosate-tolerant legume with a potential as a cover crop in temperate areas of the country. In this work, glyphosate tolerance was characterized in two Mexican cologania (a treated (T) and an untreated (UT)) populations as being representatives of the species, compared in turn to a glyphosate-susceptible hairy fleabane (S) (Conyza bonariensis (L.) Cronq.) population. Experiments revealed that T and UT Mexican cologania populations had a higher tolerance index (TI), and a lower shikimic acid accumulation and foliar retention than the hairy fleabane S population. Absorption and translocation, leaf morphology and metabolism studies were only carried out in the Mexican cologania T population and the hairy fleabane S population. The latter absorbed 37% more (14)C-glyphosate compared to the Mexican cologania T at 96 h after treatment (HAT). Mexican cologania T translocated less herbicide from the treated leaf to the remainder of the plant than hairy fleabane S. The Mexican cologania T presented a greater epicuticular wax coverage percentage than the hairy fleabane S. This morphological characteristic contributed to the low glyphosate absorption observed in the Mexican cologania. In addition, the Mexican cologania T metabolized glyphosate mainly into AMPA, formaldehyde and sarcosine. These results indicate that the high glyphosate tolerance observed in Mexican cologania is mainly due to the poor penetration and translocation of glyphosate into the active site, and the high glyphosate degradation into non-toxic substances.
[Mh] Termos MeSH primário: Conyza/fisiologia
Fabaceae/fisiologia
Glicina/análogos & derivados
Resistência a Herbicidas
Herbicidas/farmacologia
[Mh] Termos MeSH secundário: Transporte Biológico
Conyza/anatomia & histologia
Conyza/efeitos dos fármacos
Relação Dose-Resposta a Droga
Fabaceae/anatomia & histologia
Fabaceae/efeitos dos fármacos
Glicina/química
Glicina/metabolismo
Glicina/farmacologia
Herbicidas/química
Herbicidas/metabolismo
Folhas de Planta/anatomia & histologia
Folhas de Planta/efeitos dos fármacos
Folhas de Planta/fisiologia
Ácido Chiquímico/metabolismo
Tricomas
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Herbicides); 29MS2WI2NU (Shikimic Acid); 4632WW1X5A (glyphosate); TE7660XO1C (Glycine)
[Em] Mês de entrada:1609
[Cu] Atualização por classe:161020
[Lr] Data última revisão:
161020
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151210
[St] Status:MEDLINE


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[PMID]:26573966
[Au] Autor:Kleinman Z; Ben-Ami G; Rubin B
[Ad] Endereço:Robert H Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Rehovot, Israel.
[Ti] Título:From sensitivity to resistance - factors affecting the response of Conyza spp. to glyphosate.
[So] Source:Pest Manag Sci;72(9):1681-8, 2016 Sep.
[Is] ISSN:1526-4998
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Conyza bonariensis and C. canadensis are troublesome weeds, particularly in fields with minimum tillage, on roadsides and in perennial crops. The distribution of these difficult-to-control species is further increased by the spread of glyphosate-resistant populations. A preliminary investigation has demonstrated the existence of various degrees of glyphosate tolerance/resistance in these populations, underscoring the need to examine the relationship between glyphosate efficacy and plant growth conditions. RESULTS: In populations exposed to glyphosate at different temperatures, glyphosate tolerance increased linearly as the temperature was increased, whereas when grown under the same temperatures, they largely responded similarly to the herbicide. Furthermore, the sensitivity of plants to glyphosate decreased significantly with plant age and increased following temporal exposure to shading. Dose-response studies confirmed the glyphosate resistance of four C. bonariensis populations that were 8-30 times more resistant to glyphosate than the most glyphosate-sensitive population. These populations retained their characteristic glyphosate resistance even under unfavourable growth conditions. CONCLUSION: These findings indicate that the effect of glyphosate on both Conyza species is strongly linked to growing conditions. This has great importance for our understanding of glyphosate resistance and for control of these weeds in agricultural systems. © 2015 Society of Chemical Industry.
[Mh] Termos MeSH primário: Glicina/análogos & derivados
Resistência a Herbicidas
Herbicidas/farmacologia
Plantas Daninhas/efeitos dos fármacos
[Mh] Termos MeSH secundário: Conyza/efeitos dos fármacos
Conyza/crescimento & desenvolvimento
Glicina/farmacologia
Israel
Plantas Daninhas/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Herbicides); 4632WW1X5A (glyphosate); TE7660XO1C (Glycine)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170406
[Lr] Data última revisão:
170406
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151118
[St] Status:MEDLINE
[do] DOI:10.1002/ps.4187



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