Plant Defenses
Mostrando 1-12 de 78 artigos, teses e dissertações.
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1. Preference of Neoseiulus californicus (Acari: Phytoseiidae) for volatiles of Bt maize induced by multiple herbivory
ABSTRACT Plant indirect induced defenses against herbivores are characterized by the production of plant volatiles that to attract natural enemies. The objective of this study was to evaluate whether the attack of the two-spotted spider mite Tetranychus urticae or the multiple herbivory of T. urticae together with the fall armyworm Spodoptera frugiperda are
Rev. Bras. entomol.. Publicado em: 13/01/2020
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2. Antiherbivory defense mechanisms along an environmental gradient in restinga
ABSTRACT Plant-herbivore interactions have directed the evolution of defense mechanisms in plants, which can vary intraspecifically according to environmental quality. This study evaluated variation in the production of antiherbivory defenses in plant species distributed along an environmental gradient of restinga. The study was performed in Parque Estadual
Acta Bot. Bras.. Publicado em: 21/09/2017
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3. Benzoxazinoids: Reactivity and Modes of Action of a Versatile Class of Plant Chemical Defenses
In order to protect themselves from biotic stresses, including enemies and competitors, many plants recruit defensive secondary metabolites. Compounds containing a 2-hydroxy-2H-1,4-benzoxazin-3(4H)-one skeleton and their derivatives, collectively known as benzoxazinoids, are common secondary metabolites in many grasses, including important cereal crops such
J. Braz. Chem. Soc.. Publicado em: 2016-08
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4. In vitro and in vivo evaluation of efficacy and safety of photoprotective formulations containing antioxidant extracts
ABSTRACT Chronic exposure to solar radiation could contribute to premature skin aging and skin cancer. Skin presents its own antioxidant defense, however when defenses are out of balance, reactive oxygen species could damage biological structures. In the present work, an oil-in-water photoprotective emulsion was developed and Bauhinia microstachya var. massa
Rev. bras. farmacogn.. Publicado em: 2016-04
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5. Noctuidae-induced plant volatiles: current situation and prospects
Noctuids are phytophagous lepidopterans with some species causing significant damage to agriculture. The host plants, in turn, have developed defense mechanisms to cope with them, for instance chemical defenses. In this study we review the literature on plant volatiles induced by noctuids, and discuss the methodologies used to induce the production of volati
Quím. Nova. Publicado em: 2014
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6. Fluctuating asymmetry of and herbivory on Poincianella pyramidalis (Tul.) L.P. Queiroz (Fabaceae) in pasture and secondary tropical dry forest
Plants subjected to stressful environments tend to be more asymmetric with reduced defenses and are therefore more vulnerable to herbivory. This study investigates the relationship between herbivory and fluctuating asymmetry (FA) in Poincianella pyramidalis in two contrasting habitat types in the Brazilian caatinga (shrublands). We tested the following hypot
Acta Bot. Bras.. Publicado em: 2013-03
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7. Indução e redução de defesas em plantas de tomate por ácaros fitófagos: efeitos de ataques sequenciais e simultâneos / Induction and reduction of tomato plant defenses by spider mites: effects of sequential and simultaneous attacks
Neste estudo foi investigado o efeito das defesas induzidas diretas de plantas de tomate sobre parâmetros biológicos do ácaro vermelho Tetranychus evansi Baker &Pritchard (Acari: Tetranychidae) e do ácaro rajado Tetranychus urticae Koch (Acari: Tetranychidae), pelo fato desses ácaros serem pragas na cultura do tomateiro. No primeiro capítulo foram dete
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/02/2012
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8. Evaluation of larvicidal activity of the methanolic extracts of Piper alatabaccum branches and P. tuberculatum leaves and compounds isolated against Anopheles darlingi
Piper is a notable genus among Piperaceae due to their secondary metabolites such as lignans, amides, esters and long chain fatty acids used as anti-herbivore defenses with comparable effects of pyrethroids, that holds a promise in insect control, including malaria vectors such as Anopheles darlingi, the main vector in the North of Brazil. Methanolic extract
Rev. bras. farmacogn.. Publicado em: 03/04/2012
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9. Plant responses to stresses: role of ascorbate peroxidase in the antioxidant protection
When plants are exposed to stressful environmental conditions, the production of Reactive Oxygen Species (ROS) increases and can cause significant damage to the cells. Antioxidant defenses, which can detoxify ROS, are present in plants. A major hydrogen peroxide detoxifying system in plant cells is the ascorbate-glutathione cycle, in which, ascorbate peroxid
Genet. Mol. Biol.. Publicado em: 2012
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10. Expressão gênica diferencial de genótipos de citros em resposta à infecção do vírus da leprose (CiLV-C) / Differential gene expression of citrus genotypes in response to Citrus leprosis C (CiLV_C) infection
O Citrus leprosis virus C (CiLV-C) é o agente causal da leprose dos citros, uma doença incomum transmitida pelo ácaro Brevipalpus phoenicis. Uma vez que o CiLV-C permanece confinado em lesões localizadas nas folhas, ramos e frutos sem causar infecção sistêmica, o vetor precisa se alimentar nestas lesões para adquirir o vírus. O objetivo deste trabal
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/08/2011
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11. Characterization of the dry bean polygalacturonase-inhibiting protein (PGIP) gene family during Sclerotinia sclerotiorum (Sclerotiniaceae) infection.
Polygalacturonase-inhibiting proteins are leucine-rich repeat proteins that inhibit fungal endopolygalacturonases. The interaction of polygalacturonase-inhibiting protein with endopolygalacturonases limits the destructive potential of endopolygalacturonases and may trigger plant defense responses induced by oligogalacturonides. We examined the expression of
Genetics and Molecular Research. Publicado em: 2011
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12. Interações ecológicas em Malpighiaceae no cerrado: compartilhamento de guildas de herbívoros e variações nos resultados da interação formiga-planta / Ecological interactions in Malpighiaceae in the Cerrado: sharing of guilds from herbivores and variations in the results of ant-plant interaction
Ecological interactions represent essential tools for a better understanding of natural communities, having in animal-plant relationships important models for study. For that, become needful phenological analyses of plants, capable of demonstrating the flowering strategies and with it the ways of temporal organization of resources available for herbivores. T
Publicado em: 2010