Interplant communication: airborne methyl jasmonate induces synthesis of proteinase inhibitors in plant leaves.

Farmer, Edward E.; Ryan, Clarence A.

doi:10.1073/pnas.87.19.7713

Cited by 1,229 publications

(732 citation statements)

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“…Um dos produtos finais da Via das Lipoxigenases é o ácido jasmônico, sendo esse um sinalizador para a ativação de genes de defesa de plantas a insetos, os quais expressam para inibidores de proteases (FARMER e RYAN, 1992). Assim, foi realizada a determinação de inibidores de proteases, observando aumento na produção deles em relação ao controle, em todos os tempos analisados, tanto durante a presença do inseto na planta (12, 24, 48 e 72 horas) quanto após a sua remoção (6, 12, 24 e 48 horas) (TABELA 2).…”

Section: Resultsunclassified

“…Isso parece ocorrer pelo aumento da eficiência catalítica de lipoxigenases e, em seguida, pelo aumento da ação da hidroperóxido ciclase, levando à conversão dos hidroperóxidos formados em ácido 12-oxo-fitodienóico e, posteriormente, a ácido jasmônico. Este último é proposto interagir com um receptor de membrana, ativando a expressão de genes que expressam inibidores de proteases (FARMER e RYAN, 1992). Dessa forma, com esses resultados reforça-se a hipótese de que as isoenzimas lipoxigenases são enzimas-chave no mecanismo de resposta de plantas de soja contra herbívoros e que o acúmulo de inibidores de proteases esteja envolvido nesse mecanismo.…”

Section: Resultsunclassified

“…Já a hidroperóxido ciclase catalisa a formação de ácidos graxos cíclicos derivados do ácido 13-hidroperoxilinolênico, que são precursores da síntese de ácido jasmônico. Esse possui atividade de fitorregulador e está envolvido em processos de desenvolvimento, bem como na resposta da planta a insetos e patógenos, induzindo à síntese de genes que se expressam para inibidores de proteases (FARMER e RYAN, 1990, 1992.…”

Section: Introductionunclassified

“…A produção de inibidores de proteases constitui num dos um dos mecanismos de defesa de plantas contra invasão de pragas (FARMER e RYAN, 1990).…”

Section: Introductionunclassified

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Função bioquímica da via daslipoxigenases em plantas de soja submetidas ao ataque de mosca-branca (Bemisia argentifolii)

Silva

Oliveira²,

Brumano

et al. 2004

Ciênc. agrotec.

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RESUMONeste trabalho, avaliou-se a capacidade da planta de soja de uma cultivar comercial, IAC-100, e de um genótipo IAC-100 TN que apresenta ausência de lipoxigenases nas sementes de responderem ao ataque de mosca-branca (Bemisia argentifolii) pela via das Lipoxigenases. Foi realizada a caracterização cinética do pool de lipoxigenases. Os valores de K Mapp decresceram nas plantas atacadas, sugerindo uma alteração no pool de lipoxigenases foliares. Valores similares de K Mapp , entre os genótipos, indicam que a remoção de lipoxigenases de sementes não interferiram na expressão de lipoxigenases em folhas. Ocorreu aumento significativo na produção de inibidores de proteases. Com esses resultados, infere-se que a produção de inibidores de proteases está envolvida no mecanismo de defesa de soja ao ataque da mosca-branca.Termos para indexação: Soja, lipoxigenases, mosca branca, defesa de planta.ABSTRACT This work evaluated the capacity of the soybean plant, from a commercial cultivar IAC-100 and from a genotype IAC-100 TN, with absence of lipoxygenases in their seeds, to respond to the attack by whitefly (sucking insect) by lipoxygenases pathway. The kinetic characterization of the pool of lipoxygenases was determined. The K Mapp values decreased, suggesting a change in the pool of lipoxygenases in response to the attack by whitefly. The similar K Mapp values suggest that the removal of the lipoxygenases from the seeds does not change the expression of LOX in the leaves. There was a noticeable increase in protease inhibitors. These results suggest that the production of protease inhibitors are involved in the defense mechanism of soybean plant against whitefly injury. INTRODUÇÃOLipoxigenases (E.C. 1.13.11.12) catalisam a dioxigenação estereoespecífica de ácidos graxos poliinsturados contendo o sistema cis,cis-1,4-pentadieno com formação dos respectivos derivados hidroperóxidos, originando, assim, moléculas reativas com atividades fisiológicas pronunciadas (VICK e ZIMMERMAN, 1983).Duas principais vias para o metabolismo dos hidroperóxidos de ácidos graxos produzidos pelas lipoxigenases, chamadas de Via das Lipoxigenases, vêm sendo propostas para plantas superiores. Essa via envolve a ação de duas enzimas, ou seja, hidroperóxido liase e hidroperóxido ciclase. Após a ação da hidroperóxido liase, pode ocorrer a produção de aldeídos, os quais podem inibir o crescimento de fungos, insetos e protozoá-Rios (CROFT et al., 1993), podendo também agir como

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Section: Resultsunclassified

Section: Introductionunclassified

“…A produção de inibidores de proteases constitui num dos um dos mecanismos de defesa de plantas contra invasão de pragas (FARMER e RYAN, 1990).…”

Section: Introductionunclassified

See 2 more Smart Citations

Função bioquímica da via daslipoxigenases em plantas de soja submetidas ao ataque de mosca-branca (Bemisia argentifolii)

Silva

Oliveira²,

Brumano

et al. 2004

Ciênc. agrotec.

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“…It is clear that, at sufficiently high doses, several substances can immediately mobilize direct and indirect defences in perceiving plants [7,10,[25][26][27]. However, it is likely that, at lower more realistic dosages, the defences are not induced directly but instead the plants are induced to prepare themselves molecularly for future attack.…”

Section: Priming For Enhanced Plant Defence As An Additional Benefitmentioning

confidence: 99%

Exploiting scents of distress: the prospect of manipulating herbivore-induced plant odours to enhance the control of agricultural pests

Turlings

Ton

2006

Current Opinion in Plant Biology

229

176

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In response to feeding by arthropods, plants actively and systemically emit various volatile substances. It has been proposed that these herbivore-induced volatiles (HIPVs) can be exploited in agricultural pest control because they might repel herbivores and because they serve as attractants for the enemies of the herbivores. Indeed, recent studies with transgenic plants confirm that odour emissions can be manipulated in order to enhance the plants' attractiveness to beneficial arthropods. An additional advantage of manipulating HIPV emissions could be their effects on neighbouring plants, as a rapidly increasing number of studies show that exposure to HIPVs primes plants for augmented defence expression. Targeting the right volatiles for enhanced emission should lead to ecologically and economically sound ways of combating important pests. IntroductionPlant defences against herbivores are not limited to physical and chemical barriers that directly aim to harm their attackers, it is becoming increasingly evident that plants also employ strategies of indirect defence. One form of indirect defence in plants is to attract predators and parasitoids by signalling the presence of potential prey or hosts. This attraction of the third trophic level is one of the presumed functions of herbivore-induced plant volatiles (HIPVs), which are released more or less specifically in response to herbivore attack. The first evidence for tritrophic signalling [1,2] has generated a remarkable interest in this phenomenon from scientists from a broad range of disciplines. This interest has resulted in what can be considered the most interdisciplinary approach to any aspect of plant-arthropod interactions. A rapidly increasing number of behavioural, chemical and evolutionary ecologists, plant physiologists and crop scientists devote their research efforts to the understanding of the mechanisms, selective pressures and ecological consequences of the interactions. Moreover, there is increased interest in understanding the implications of induced plant signalling in the light of agricultural pest control, as has been outlined in previous reviews [3][4][5]. Here we focus, after a brief historical account, on the latest developments in this area. In addition, we address the recent studies that point to a priming effect in plants that are exposed to certain HIPVs, conferring an enhanced defensive capacity against future insect attack [6 ,7-11]. We conclude, with some reservations, that there is not only reason for optimism that manipulation of HIPVs emissions can indeed lead to enhanced repulsion of pests and attraction of their natural enemies but, moreover, that enhanced volatile information transfer between plants might, if exploited appropriately, improve the efficiency of the plant's direct and indirect defence strategies through priming [4,12]. Figures 1 and 2 summarize the various interactions in which HIPVs are implicated as we have studied them for maize plants. The role of HIPVs in indirect plant defencesPrice and colleagues [13] w...

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Induzierte und konstitutiv emittierte Pflanzendüfte: Mevalonat-unabhängige Biosynthese terpenoider Duftstoffe

et al. 1998

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Interplant communication: airborne methyl jasmonate induces synthesis of proteinase inhibitors in plant leaves.

Cited by 1,229 publications

References 31 publications

Função bioquímica da via daslipoxigenases em plantas de soja submetidas ao ataque de mosca-branca (Bemisia argentifolii)

Função bioquímica da via daslipoxigenases em plantas de soja submetidas ao ataque de mosca-branca (Bemisia argentifolii)

Exploiting scents of distress: the prospect of manipulating herbivore-induced plant odours to enhance the control of agricultural pests

Induzierte und konstitutiv emittierte Pflanzendüfte: Mevalonat-unabhängige Biosynthese terpenoider Duftstoffe

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