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Pesquisa : B01.650.940.800.575.912.250.583.670.875 [Categoria DeCS]
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  1 / 120 MEDLINE  
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[PMID]:28902851
[Au] Autor:Fuller AW; Young P; Pierce BD; Kitson-Finuff J; Jain P; Schneider K; Lazar S; Taran O; Palmer AG; Lynn DG
[Ad] Endereço:Departments of Biology and Chemistry, Emory University, Atlanta, GA, United States of America.
[Ti] Título:Redox-mediated quorum sensing in plants.
[So] Source:PLoS One;12(9):e0182655, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The rhizosphere, the narrow zone of soil around plant roots, is a complex network of interactions between plants, bacteria, and a variety of other organisms. The absolute dependence on host-derived signals, or xenognosins, to regulate critical developmental checkpoints for host commitment in the obligate parasitic plants provides a window into the rhizosphere's chemical dynamics. These sessile intruders use H2O2 in a process known as semagenesis to chemically modify the mature root surfaces of proximal host plants and generate p-benzoquinones (BQs). The resulting redox-active signaling network regulates the spatial and temporal commitments necessary for host attachment. Recent evidence from non-parasites, including Arabidopsis thaliana, establishes that reactive oxygen species (ROS) production regulates similar redox circuits related to root recognition, broadening xenognosins' role beyond the parasites. Here we compare responses to the xenognosin dimethoxybenzoquinone (DMBQ) between the parasitic plant Striga asiatica and the non-parasitic A. thaliana. Exposure to DMBQ simulates the proximity of a mature root surface, stimulating an increase in cytoplasmic Ca2+ concentration in both plants, but leads to remarkably different phenotypic responses in the parasite and non-parasite. In S. asiatica, DMBQ induces development of the host attachment organ, the haustorium, and decreases ROS production at the root tip, while in A. thaliana, ROS production increases and further growth of the root tip is arrested. Obstruction of Ca2+ channels and the addition of antioxidants both lead to a decrease in the DMBQ response in both parasitic and non-parasitic plants. These results are consistent with Ca2+ regulating the activity of NADPH oxidases, which in turn sustain the autocatalytic production of ROS via an external quinone/hydroquinone redox cycle. Mechanistically, this chemistry is similar to black and white photography with the emerging dynamic reaction-diffusion network laying the foundation for the precise temporal and spatial control underlying rhizosphere architecture.
[Mh] Termos MeSH primário: Arabidopsis
Interações Hospedeiro-Parasita
Fenômenos Fisiológicos Vegetais
Percepção de Quorum/fisiologia
[Mh] Termos MeSH secundário: Arabidopsis/efeitos dos fármacos
Arabidopsis/crescimento & desenvolvimento
Arabidopsis/metabolismo
Arabidopsis/parasitologia
Benzoquinonas/farmacologia
Sinalização do Cálcio/efeitos dos fármacos
Interações Hospedeiro-Parasita/efeitos dos fármacos
Peróxido de Hidrogênio/metabolismo
Peróxido de Hidrogênio/farmacologia
Meristema/efeitos dos fármacos
Meristema/crescimento & desenvolvimento
Meristema/metabolismo
Meristema/parasitologia
Oxirredução
Raízes de Plantas/efeitos dos fármacos
Raízes de Plantas/crescimento & desenvolvimento
Raízes de Plantas/metabolismo
Raízes de Plantas/parasitologia
Espécies Reativas de Oxigênio/metabolismo
Striga/efeitos dos fármacos
Striga/crescimento & desenvolvimento
Striga/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Benzoquinones); 0 (Reactive Oxygen Species); BBX060AN9V (Hydrogen Peroxide)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170914
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0182655


  2 / 120 MEDLINE  
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[PMID]:28495334
[Au] Autor:Lumba S; Subha A; McCourt P
[Ad] Endereço:Cell and Systems Biology, University of Toronto and the Centre for the Analysis of Genome Evolution and Function, University of Toronto, Toronto, ON M5S 3B2, Canada.
[Ti] Título:Found in Translation: Applying Lessons from Model Systems to Strigolactone Signaling in Parasitic Plants.
[So] Source:Trends Biochem Sci;42(7):556-565, 2017 Jul.
[Is] ISSN:0968-0004
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Strigolactones (SLs) are small molecules that act as endogenous hormones to regulate plant development as well as exogenous cues that help parasitic plants to infect their hosts. Given that parasitic plants are experimentally challenging systems, researchers are using two approaches to understand how they respond to host-derived SLs. The first involves extrapolating information on SLs from model genetic systems to dissect their roles in parasitic plants. The second uses chemicals to probe SL signaling directly in the parasite Striga hermonthica. These approaches indicate that parasitic plants have co-opted a family of α/ß hydrolases to perceive SLs. The importance of this genetic and chemical information cannot be overstated since parasitic plant infestations are major obstacles to food security in the developing world.
[Mh] Termos MeSH primário: Lactonas/metabolismo
Modelos Biológicos
Plantas/parasitologia
Transdução de Sinais
Striga/metabolismo
[Mh] Termos MeSH secundário: Plantas/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Lactones)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171011
[Lr] Data última revisão:
171011
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170513
[St] Status:MEDLINE


  3 / 120 MEDLINE  
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[PMID]:28215609
[Au] Autor:Charnikhova TV; Gaus K; Lumbroso A; Sanders M; Vincken JP; De Mesmaeker A; Ruyter-Spira CP; Screpanti C; Bouwmeester HJ
[Ad] Endereço:Laboratory of Plant Physiology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands.
[Ti] Título:Zealactones. Novel natural strigolactones from maize.
[So] Source:Phytochemistry;137:123-131, 2017 May.
[Is] ISSN:1873-3700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In the root exudate and root extracts of maize hybrid cv NK Falkone seven putative strigolactones were detected using UPLC-TQ-MS-MS. All seven compounds displayed MS-MS-fragmentation common for strigolactones and particularly the presence of a fragment of m/z 97 Da, which may indicate the presence of the so-called D-ring, suggests they are strigolactones. The levels of all these putative strigolactones increased upon phosphate starvation and decreased upon fluridone (carotenoid biosynthesis inhibitor) treatment, both of which are a common response for strigolactones. All seven compounds were subsequently isolated with prep-HPLC-MS. They all exhibited Striga hermonthica seed germination inducing activity just as the synthetic strigolactone analog GR24. The structure of two of the seven compounds was elucidated by NMR spectroscopy as: methyl (2E,3E)-4-(3,3-dimethyl-5-oxo-2-(prop-1-en-2-yl)tetrahydrofuran-2-yl)-2-(((4-methyl-5-oxo-2,5-dihydrofuran-2-yl)oxy)methylene)but-3-enoate (two diastereomers 1a and 1b). Strigolactones (1a/b) are closely related to the methyl ester of carlactonoic acid (MeCLA) and heliolactone. However, they contain a unique 4,4-dimethyltetrahydrofuran-2-one motif as the "A-ring" instead of the classical (di)methylcyclohexene. Because these compounds were isolated from maize (Zea mays) we called them "zealactone 1a and 1b". The implications of this discovery for our view on strigolactones and their biosynthesis are discussed.
[Mh] Termos MeSH primário: 4-Butirolactona/análogos & derivados
Lactonas/química
Exsudatos de Plantas/química
Raízes de Plantas/química
Zea mays/química
[Mh] Termos MeSH secundário: 4-Butirolactona/química
4-Butirolactona/isolamento & purificação
Cromatografia Líquida de Alta Pressão
Germinação/efeitos dos fármacos
Lactonas/isolamento & purificação
Estrutura Molecular
Sementes/efeitos dos fármacos
Striga/efeitos dos fármacos
Espectrometria de Massas em Tandem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lactones); 0 (Plant Exudates); OL659KIY4X (4-Butyrolactone)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170407
[Lr] Data última revisão:
170407
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170221
[St] Status:MEDLINE


  4 / 120 MEDLINE  
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[PMID]:27611187
[Au] Autor:Mohemed N; Charnikhova T; Bakker EJ; van Ast A; Babiker AG; Bouwmeester HJ
[Ad] Endereço:Laboratory of Plant Physiology, Wageningen University, Wageningen, The Netherlands.
[Ti] Título:Evaluation of field resistance to Striga hermonthica (Del.) Benth. in Sorghum bicolor (L.) Moench. The relationship with strigolactones.
[So] Source:Pest Manag Sci;72(11):2082-2090, 2016 Nov.
[Is] ISSN:1526-4998
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Significant losses in sorghum biomass and grain yield occur in sub-Saharan Africa owing to infection by the root-parasitic weed Striga hermonthica (Del.) Benth. One strategy to avoid these losses is to adopt resistant crop varieties. For further delineation of the role of germination stimulants in resistance, we conducted a field experiment employing six sorghum genotypes, in eastern Sudan, and in parallel analysed the strigolactone levels in the root exudates of these genotypes under controlled conditions in Wageningen. RESULTS: The root exudates of these genotypes displayed large differences in strigolactone composition and Striga-germination-inducing activity. Korokollow, Fakimustahi and Wadfahel exuded the highest amounts of 5-deoxystrigol. Fakimustahi was by far the highest sorgomol producer, and Wadbaco and SRN39 produced the highest amount of orobanchol. The concentration of 5-deoxystrigol in the root exudate showed a significant positive correlation with in vitro Striga germination and was positively associated with Striga infection in the field experiments, whereas orobanchol was negatively associated with Striga infection in the field experiments. CONCLUSION: For the first time a close association is reported between strigolactone levels analysed under laboratory conditions and Striga infection in the field in sorghum genotypes. These genotypes may be used for further study of this resistance mechanism and for the introgression of the low germination trait in other sorghum varieties to breed for a strigolactone composition with low stimulant activity. The use of such improved varieties in combination with other Striga management tools could possibly alleviate the current Striga problem on the African continent. © 2016 Society of Chemical Industry.
[Mh] Termos MeSH primário: Lactonas/metabolismo
Reguladores de Crescimento de Planta/metabolismo
Plantas Daninhas/fisiologia
Sorghum/parasitologia
Striga/fisiologia
[Mh] Termos MeSH secundário: Antibiose
Países Baixos
Raízes de Plantas/metabolismo
Raízes de Plantas/parasitologia
Sorghum/genética
Sorghum/metabolismo
Sudão
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (5-deoxystrigol); 0 (Lactones); 0 (Plant Growth Regulators); 0 (orobanchol)
[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:160910
[St] Status:MEDLINE
[do] DOI:10.1002/ps.4426


  5 / 120 MEDLINE  
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[PMID]:27428512
[Au] Autor:Holbrook-Smith D; Toh S; Tsuchiya Y; McCourt P
[Ad] Endereço:Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada.
[Ti] Título:Small-molecule antagonists of germination of the parasitic plant Striga hermonthica.
[So] Source:Nat Chem Biol;12(9):724-9, 2016 Sep.
[Is] ISSN:1552-4469
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Striga spp. (witchweed) is an obligate parasitic plant that attaches to host roots to deplete them of nutrients. In Sub-Saharan Africa, the most destructive Striga species, Striga hermonthica, parasitizes major food crops affecting two-thirds of the arable land and over 100 million people. One potential weakness in the Striga infection process is the way it senses the presence of a host crop. Striga only germinates in the presence of the plant hormone strigolactone, which exudes from a host root. Hence small molecules that perturb strigolactone signaling may be useful tools for disrupting the Striga lifecycle. Here we developed a chemical screen to suppress strigolactone signaling in the model plant Arabidopsis. One compound, soporidine, specifically inhibited a S. hermonthica strigolactone receptor and inhibited the parasite's germination. This indicates that strigolactone-based screens using Arabidopsis are useful in identifying lead compounds to combat Striga infestations.
[Mh] Termos MeSH primário: Germinação/efeitos dos fármacos
Piperidinas/farmacologia
Receptores de Superfície Celular/antagonistas & inibidores
Bibliotecas de Moléculas Pequenas/farmacologia
Striga/efeitos dos fármacos
[Mh] Termos MeSH secundário: Arabidopsis/efeitos dos fármacos
Arabidopsis/metabolismo
Lactonas/farmacologia
Estrutura Molecular
Piperidinas/química
Reguladores de Crescimento de Planta/farmacologia
Receptores de Superfície Celular/metabolismo
Bibliotecas de Moléculas Pequenas/química
Striga/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lactones); 0 (Piperidines); 0 (Plant Growth Regulators); 0 (Receptors, Cell Surface); 0 (Small Molecule Libraries); 0 (soporidine)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170515
[Lr] Data última revisão:
170515
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160719
[St] Status:MEDLINE
[do] DOI:10.1038/nchembio.2129


  6 / 120 MEDLINE  
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[PMID]:27318656
[Au] Autor:Khosla A; Nelson DC
[Ad] Endereço:Department of Genetics, University of Georgia, Athens, GA 30602, USA.
[Ti] Título:Strigolactones, super hormones in the fight against Striga.
[So] Source:Curr Opin Plant Biol;33:57-63, 2016 Oct.
[Is] ISSN:1879-0356
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Strigolactones are plant hormones that control diverse aspects of plant growth, but are also exuded into soil as recruitment signals for arbuscular mycorrhizal fungi interactions. Highly damaging parasitic weeds in the Orobanchaceae family have coopted strigolactones as germination cues that indicate the presence of a host. Recent studies have established how strigolactones are actively transported within and out of plants. Key components of the strigolactone signaling system have been identified, including strigolactone receptors in angiosperms and parasites, as well as downstream targets that are polyubiquitinated and proteolyzed following strigolactone perception. The basis for protein-protein interactions among these signaling components has also been explored. We propose several strategies to translate current knowledge of strigolactone transport and signaling into parasite control methods.
[Mh] Termos MeSH primário: Gossypium/parasitologia
Lactonas/metabolismo
Reguladores de Crescimento de Planta/metabolismo
Striga/fisiologia
Controle de Plantas Daninhas
[Mh] Termos MeSH secundário: Plantas Daninhas/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Lactones); 0 (Plant Growth Regulators)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170920
[Lr] Data última revisão:
170920
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160620
[St] Status:MEDLINE


  7 / 120 MEDLINE  
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[PMID]:27267731
[Au] Autor:Fernández-Aparicio M; Masi M; Maddau L; Cimmino A; Evidente M; Rubiales D; Evidente A
[Ad] Endereço:UMR 1347 Agroécologie, INRA , BP 86510, F-21000 Dijon, France.
[Ti] Título:Induction of Haustorium Development by Sphaeropsidones in Radicles of the Parasitic Weeds Striga and Orobanche. A Structure-Activity Relationship Study.
[So] Source:J Agric Food Chem;64(25):5188-96, 2016 Jun 29.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Crop attack by parasitic weeds such as Striga and Orobanche occurs through developmental processes triggered by host chemodetection. Seeds of those weed species remain dormant in the soil until germination is triggered by host root exudates. The development of haustorium, a parasitic plant organ that invades the host to withdraw its nutrients, is also initiated in Orobanchaceae by host molecular cues. The induction of haustorium development by exogenous signals has previously been reported for Striga but not for Orobanche species. In this work, we demonstrate that sphaeropsidone and epi-sphaeropsidone, two phytotoxic cyclohexene oxides isolated from the fungus Diplodia cupressi, a causal agent of cypress canker, induce haustorium development in radicles of the parasitic weeds Striga hermonthica, Orobanche crenata, and Orobanche cumana. This is the first report of chemical stimulation of haustorium development in radicles of Orobanche in the absence of host. In addition, SAR studies were carried out by testing the haustorium-inducing activity of the natural cyclohexene oxides, seven already known and four new hemisynthetic derivatives, in O. cumana, O. crenata, and S. hermonthica, to find a molecular specificity model required for haustorium induction. The results suggested that the haustorium-inducing activity is due to the possibility to convert the natural sphaeropsidone and natural and hemisynthetic derivatives in the corresponding 3-methoxyquinone and that the stereochemistry at C-5 also seems to affect this activity.
[Mh] Termos MeSH primário: Diterpenos/química
Diterpenos/farmacologia
Orobanche/efeitos dos fármacos
Plantas Daninhas/efeitos dos fármacos
Striga/efeitos dos fármacos
[Mh] Termos MeSH secundário: Ascomicetos/química
Germinação/efeitos dos fármacos
Orobanche/crescimento & desenvolvimento
Plantas Daninhas/crescimento & desenvolvimento
Sementes/efeitos dos fármacos
Striga/crescimento & desenvolvimento
Relação Estrutura-Atividade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Diterpenes); 0 (sphaeropsidone)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170330
[Lr] Data última revisão:
170330
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160609
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.6b01910


  8 / 120 MEDLINE  
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[PMID]:26929041
[Au] Autor:Takahashi I; Fukui K; Asami T
[Ad] Endereço:Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.
[Ti] Título:Chemical modification of a phenoxyfuranone-type strigolactone mimic for selective effects on rice tillering or Striga hermonthica seed germination.
[So] Source:Pest Manag Sci;72(11):2048-2053, 2016 Nov.
[Is] ISSN:1526-4998
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: We previously reported that a series of phenoxyfuranone compounds, designated 'debranones', mimic strigolactone (SL) activity. 4-Bromodebranone (4BD) is a functionally selective SL mimic that reduces the number of shoot branches on rice more potently than GR24, a typical synthetic SL analogue, but does not induce seed germination in the root-parasitic plant Striga hermonthica. To enhance the selective activity of debranones in stimulating the seed germination of root-parasitic plants, we prepared several analogues of 4BD in which the chlorine atom was substituted with an H atom at the o-, m- or p-position on the phenyl ring (designated 2-, 3-, or 4-chlorodebranone, respectively) or had a bicyclic group instead of the phenyl ring. We evaluated the biological activities of the compounds with rice tillering assays and S. hermonthica seed germination assays. RESULTS: Both assays showed that the substituent position affected debranone efficiency, and among the monochlorodebranones, 2-chlorodebranone was more effective than the other two isomers in both assays. When the activities of the bicyclic debranones were compared in the same two assays, one was more active than GR24 in the rice tillering assay. This debranone also stimulated the germination of S. hermonthica seeds. Thus, some debranone derivatives induced the germination of S. hermonthica seeds, although their activities were still ∼1/20 that of GR24. CONCLUSION: These results strongly suggest that further and rigorous structure-activity relationship studies of the debranones will identify derivatives that more potently stimulate the suicidal germination of S. hermonthica seeds. © 2016 Society of Chemical Industry.
[Mh] Termos MeSH primário: Furanos/farmacologia
Oryza/efeitos dos fármacos
Reguladores de Crescimento de Planta/farmacologia
Striga/efeitos dos fármacos
[Mh] Termos MeSH secundário: Germinação/efeitos dos fármacos
Lactonas/farmacologia
Oryza/crescimento & desenvolvimento
Sementes/efeitos dos fármacos
Sementes/crescimento & desenvolvimento
Striga/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Furans); 0 (Lactones); 0 (Plant Growth Regulators)
[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:160302
[St] Status:MEDLINE
[do] DOI:10.1002/ps.4265


  9 / 120 MEDLINE  
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[PMID]:26732760
[Au] Autor:Adler EM
[Ad] Endereço:Science writer based in USA. sciencesignalingeditors@aaas.org.
[Ti] Título:2015: Signaling Breakthroughs of the Year.
[So] Source:Sci Signal;9(409):eg1, 2016 Jan 05.
[Is] ISSN:1937-9145
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:This year's signaling breakthroughs highlight insights into the pathogenesis or treatment of cancer, malaria, and neurodegenerative disorders; reveal molecular insights into cell death; and identify signals that could be leveraged to prevent plant parasitism or engineer bacteria as microbial fuel cells.
[Mh] Termos MeSH primário: Pesquisa Biomédica/métodos
Pesquisa Biomédica/normas
Transdução de Sinais
[Mh] Termos MeSH secundário: Antimaláricos/uso terapêutico
Artemisininas/uso terapêutico
Pesquisa Biomédica/tendências
Exossomos/fisiologia
Interações Hospedeiro-Patógeno
Seres Humanos
Malária Falciparum/tratamento farmacológico
Malária Falciparum/parasitologia
Malária Falciparum/fisiopatologia
Neoplasias/fisiopatologia
Neoplasias/terapia
Doenças das Plantas/microbiologia
Doenças das Plantas/prevenção & controle
Plantas Daninhas/fisiologia
Plantas/imunologia
Plantas/microbiologia
Plasmodium falciparum/efeitos dos fármacos
Plasmodium falciparum/fisiologia
Pseudomonas aeruginosa/imunologia
Pseudomonas aeruginosa/fisiologia
Striga/fisiologia
[Pt] Tipo de publicação:EDITORIAL
[Nm] Nome de substância:
0 (Antimalarials); 0 (Artemisinins)
[Em] Mês de entrada:1610
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160107
[St] Status:MEDLINE
[do] DOI:10.1126/scisignal.aad9795


  10 / 120 MEDLINE  
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[PMID]:26732430
[Au] Autor:Samejima H; Babiker AG; Takikawa H; Sasaki M; Sugimoto Y
[Ad] Endereço:Graduate School of Agricultural Science, Kobe University, Nada, Kobe, Japan.
[Ti] Título:Practicality of the suicidal germination approach for controlling Striga hermonthica.
[So] Source:Pest Manag Sci;72(11):2035-2042, 2016 Nov.
[Is] ISSN:1526-4998
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Purple witchweed (Striga hermonthica), Orobanchaceae, is an obligate root-parasitic weed of important cereal crops. The parasite is a copious seed producer, and a huge seed bank develops soon after the onset of the initial infestation. To germinate, a Striga seed requires a pretreatment in a moist warm environment and a subsequent exposure to an exogenous stimulant. One approach to reduce the seed bank is artificially to induce germination of the seeds in the absence of or away from the host roots. A newly developed germination stimulant for S. hermonthica, designated as T-010, was evaluated for efficacy in greenhouse and field experiments under artificial Striga infestation. RESULTS: T-010 displayed germination-inducing activity in soil. Formulated T-010 applied at 0.1, 1 and 10 kg ai ha to potted soil containing S. hermonthica seeds, previously conditioned by judicious irrigation, reduced Striga emergence by 94-100%. Results of a field trial showed that formulated T-010, at the same rates as for the pot experiment, delayed and reduced Striga emergence by 33% and increased sorghum shoot and head dry weight by 18.7-40.2% and 187-241% respectively. CONCLUSION: These findings demonstrated, for the first time, the technical feasibility of suicidal germination for controlling S. hermonthica. Optimising structure, formulation and application protocol of germination stimulants should be the main goal for further improvement of the technology. © 2016 Society of Chemical Industry.
[Mh] Termos MeSH primário: Carbamatos/farmacologia
Plantas Daninhas/efeitos dos fármacos
Striga/efeitos dos fármacos
Controle de Plantas Daninhas/métodos
[Mh] Termos MeSH secundário: Produtos Agrícolas/crescimento & desenvolvimento
Germinação/efeitos dos fármacos
Lactonas/química
Lactonas/farmacologia
Plantas Daninhas/crescimento & desenvolvimento
Sorghum/crescimento & desenvolvimento
Striga/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Carbamates); 0 (Lactones)
[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:160107
[St] Status:MEDLINE
[do] DOI:10.1002/ps.4215



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