Solar Ultraviolet-B Radiation and Insect Herbivory Trigger Partially Overlapping Phenolic Responses in Nicotiana attenuata and Nicotiana longiflora

Izaguirre, Miriam M.; Mazza, Carmen; Svatoš, Aleš; Baldwin, Ian Thomas; Ballaré, Carlos L.

doi:10.1093/aob/mcl226

Cited by 148 publications

(149 citation statements)

References 59 publications

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“…Tais substâncias são frequentes em xerófitas e provavelmente reduzem a passagem de luz através das células epidérmicas, protegendo contra o excesso de radiação solar (IZAGUIRRE et al, 2007) que pode ter efeitos deletérios sobre as plantas como danos por radiação ultravioleta, estresse induzido por aquecimento das folhas e fotoinibição resultante da exposição a níveis altos de luz que danificam o sistema fotossintético (JORDAN; DILLON;WESTON., 2005). A falta de água causa perda de turgor nas células-guarda, o fechamento dos estômatos e, por sua vez, diminui o dióxido de carbono disponível limitando a fotossíntese; isto aumenta o estresse oxidativo e pode induzir o acúmulo de compostos fenólicos (CLOSE;MCARTUR, 2002).…”

Section: Resultsunclassified

Adaptações anatômicas em folhas de marmeleiro e velame da caatinga brasileira

Barros¹,

Soares²

2013

Rev. Ciênc. Agron.

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Adaptações anatômicas em folhas de marmeleiro e velame da caatinga brasileira 1Anatomical adaptations in leaves of the quince and velame of the Brazilian caatinga Ileane Oliveira Barros 2 e Arlete Aparecida Soares 3 * RESUMO -A disponibilidade de água é o principal fator limitante para as espécies vegetais em ambientes áridos e semiáridos. Nessas plantas, uma combinação de características contribui para a economia hídrica, entre elas as anatômicas. Assim, estudos em folhas de marmeleiro (Croton blanchetianus) e velame (Croton heliotropiifolius), duas espécies comuns na caatinga e de importância apícola, foram realizados para verificar as características anatômicas adaptativas relacionadas à maior eficiência na utilização de água. As folhas de ambas as espécies possuem indumento denso, parede das células basais dos tricomas impregnadas com lipídios e compostos fenólicos nas células epidérmicas e parenquimáticas. Em plantas de ambientes áridos, os tricomas podem ajudar a reduzir o aquecimento e a transpiração foliar e também impedir o fluxo apoplástico da água devido à presença de lipídios nas paredes das células basais. Estas características anatômicas podem atuar na economia hídrica e ser, desta maneira, consideradas adaptações às condições de semiaridez da caatinga. Palavras-chave:Marmeleiro. Croton. Plantas e água. Plantas da caatinga.ABSTRACT -Water availability is the main limiting factor for plants in arid and semi-arid environments. In these plants, a combination of characteristics contributes to water economy, among them being anatomical features. Thus, studies in leaves of the quince (Croton blanchetianus) and the velame (Croton heliotropiifolius), two common species in the caatinga and of importance in beekeeping, were performed to verify adaptive anatomical characteristics which are related to a greater efficiency in water usage. The leaves of both species have a dense indumentum, the basal-cell walls of the trichomes are impregnated with lipids, and phenolic compounds are found in the epidermal and parenchymal cells. In plants from arid environments, the trichomes can help reduce heating and leaf transpiration and also prevent the apoplastic flow of water due to the presence of lipids in the walls of the basal cells. These anatomical features may act on the water economy, and can thus be considered as adaptations to the semi-arid conditions of the caatinga.

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Section: Resultsunclassified

Adaptações anatômicas em folhas de marmeleiro e velame da caatinga brasileira

Barros¹,

Soares²

2013

Rev. Ciênc. Agron.

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“…The involvement in the stress response of chlorogenic acid has been reported, with its concentration increasing in lettuce upon wounding, and in tobacco upon both UV-B irradiation and insect feeding (Cantos et al 2001;Izaguirre et al 2007). In globe artichoke, we have recently shown that exposure to UV-C consistently increases the level of the major dicaffeoylquinic acid isomer, while the exogenous application of either methyl jasmonate or salicylic acid has no such effect (Moglia et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Isolation and mapping of a C3′H gene (CYP98A49) from globe artichoke, and its expression upon UV-C stress

et al. 2009

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Globe artichoke represents a natural source of phenolic compounds with dicaffeoylquinic acids along with their biosynthetic precursor chlorogenic acid (5-caffeoylquinic acid) as the predominant molecules. We report the isolation and characterization of a full-length cDNA and promoter of a globe artichoke p-coumaroyl ester 3 0 -hydroxylase (CYP98A49), which is involved in both chlorogenic acid and lignin biosynthesis. Phylogenetic analyses demonstrated that this gene belongs to the CYP98 family. CYP98A49 was also heterologously expressed in yeast, in order to perform an enzymatic assay with pcoumaroylshikimate and p-coumaroylquinate as substrates. Real Time quantitative PCR analysis revealed that CYP98A49 expression is induced upon exposure to UV-C radiation. A single nucleotide polymorphism in the CYP98A49 gene sequence of two globe artichoke varieties used for genetic mapping allowed the localization of this gene to linkage group 10 within the previously developed maps.

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“…These are synthesized by the phenylpropanoid pathway (Ververidis et al, 2007) and impart pigmentation to flowers (Tanaka et al, 2008), provide protection against damage by UV radiation (Izaguirre et al, 2007) and insects (Thoison et al, 2004;Diaz Napal et al, 2009), as well as act as signaling molecules (Kobayashi et al, 2004). About 20% of the carbon fixed in photosynthesis is directed into this pathway, which produces the majority of phenolic compounds found in nature.…”

mentioning

confidence: 99%

Modulation of Transcriptome and Metabolome of Tobacco by Arabidopsis Transcription Factor, AtMYB12, Leads to Insect Resistance

et al. 2010

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Flavonoids synthesized by the phenylpropanoid pathway participate in myriad physiological and biochemical processes in plants. Due to the diversity of secondary transformations and the complexity of the regulation of branched pathways, single gene strategies have not been very successful in enhancing the accumulation of targeted molecules. We have expressed an Arabidopsis (Arabidopsis thaliana) transcription factor, AtMYB12, in tobacco (Nicotiana tabacum), which resulted in enhanced expression of genes involved in the phenylpropanoid pathway, leading to severalfold higher accumulation of flavonols. Global gene expression and limited metabolite profiling of leaves in the transgenic lines of tobacco revealed that AtMYB12 regulated a number of pathways, leading to flux availability for the phenylpropanoid pathway in general and flavonol biosynthesis in particular. The tobacco transgenic lines developed resistance against the insect pests Spodoptera litura and Helicoverpa armigera due to enhanced accumulation of rutin. Suppression of flavonol biosynthesis by artificial microRNA reversed insect resistance of the AtMYB12-expressing tobacco plants. Our study suggests that AtMYB12 can be strategically used for developing safer insect pest-resistant transgenic plants.

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Solar Ultraviolet-B Radiation and Insect Herbivory Trigger Partially Overlapping Phenolic Responses in Nicotiana attenuata and Nicotiana longiflora

Abstract: The results suggest that the anti-herbivory effect induced by UV-B may be mediated at least in part by the accumulation of phenylpropanoid derivatives that are similar to those induced by the plant in response to insect herbivory.

Cited by 148 publications

References 59 publications

Adaptações anatômicas em folhas de marmeleiro e velame da caatinga brasileira

Adaptações anatômicas em folhas de marmeleiro e velame da caatinga brasileira

Isolation and mapping of a C3′H gene (CYP98A49) from globe artichoke, and its expression upon UV-C stress

Modulation of Transcriptome and Metabolome of Tobacco by Arabidopsis Transcription Factor, AtMYB12, Leads to Insect Resistance

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