A Protein Competition Model of Phenolic Allocation

Jones, Clive G.; Hartley, Susan

doi:10.2307/3546567

Cited by 366 publications

(361 citation statements)

References 178 publications

(207 reference statements)

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“…In an EDU-treated soybean genotype, total phenolics content decreased (Rai et al, 2015); it was interpreted that a relative abundance of carbon in EDU-treated plants influenced the rate at which the substrate, i.e. phenylalanine is diverted to protein synthesis, as protein and phenolic allocation are inversely correlated (Jones and Hartley, 1999). In the present experiment, however, differences in phenolics between genotypes were not consistently related to ozone sensitivity of the genotypes and EDU had no significant effect; indeed mean phenolic values were higher in Eþ plants.…”

Section: Discussionmentioning

confidence: 99%

Assessing the effects of ambient ozone in China on snap bean genotypes by using ethylenediurea (EDU)

Yuan

Calatayud

Jiang

et al. 2015

Environmental Pollution

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Section: Discussionmentioning

confidence: 99%

Assessing the effects of ambient ozone in China on snap bean genotypes by using ethylenediurea (EDU)

Yuan

Calatayud

Jiang

et al. 2015

Environmental Pollution

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“…Nestes estudos, de modo geral, a produção de metabólitos secundários (exceto os nitrogenados) mostra uma correlação positiva com a proporção carbono/nutrientes (C/N), isto é, em solos pobres em nutrientes, paralelamente à menor taxa de crescimento, geralmente se verifica maior produção de metabólitos secundários, particularmente derivados fenólicos 79,94,129,130 . Contudo, estas hipóteses não foram totalmente comprovadas, existindo resultados controversos e tentativas de refinamento das hipóteses de balanço C/N 34,128,[130][131][132][133][134] .…”

Section: Macronutrientesunclassified

Plantas medicinais: fatores de influência no conteúdo de metabólitos secundários

Gobbo‐Neto¹,

Lopes²

2007

Quím. Nova

920

364

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. do Café, s/n, 14040-903 Ribeirão Preto -SP, BrasilRecebido em 7/7/05; aceito em 11/4/06; publicado na web em 31/10/06 MEDICINAL PLANTS: FACTORS OF INFLUENCE ON THE CONTENT OF SECONDARY METABOLITES. Since secondary metabolites represent a chemical interface between plants and surrounding environment, their syntheses are frequently affected by environmental conditions. Thus, variations in the total content and/or of the relative proportions of secondary metabolites in plants can take place. We review the main environmental factors that can streamline or alter the production or concentration of secondary metabolites in plants. How seasonality, circadian rhythm, developmental stage and age, temperature, water availability, UV radiation, soil nutrients, altitude, atmospheric composition and tissue damage influence secondary metabolism are discussed.Keywords: variations in secondary metabolites; medicinal plants; chemical ecology. INTRODUÇÃODesde o quarto século a.C. existem relatos de normas para a coleta de plantas medicinais. Os carrascos gregos, por ex., coletavam suas amostras do veneno cicuta (Conium maculatum) pela manhã, quando os níveis de coniina são maiores 1,2 . Variações temporais e espaciais no conteúdo total, bem como as proporções relativas de metabólitos secundários em plantas ocorrem em diferentes níveis (sazonais e diárias; intraplanta, inter-e intraespecífica) e, apesar da existência de um controle genético, a expressão pode sofrer modificações resultantes da interação de processos bioquímicos, fisiológicos, ecológicos e evolutivos 3-7 . De fato, os metabólitos secundários representam uma interface química entre as plantas e o ambiente circundante, portanto, sua síntese é freqüentemente afetada por condições ambientais 8 .Os principais fatores que podem coordenar ou alterar a taxa de produção de metabólitos secundários estão expostos a seguir. Deve ser enfatizado, porém, que os estudos sobre influência destes fatores na produção de metabólitos secundários geralmente têm se limitado a um grupo restrito de espécies, predominantemente ocorrentes em regiões temperadas, muitas das quais são comercialmente importantes e podem ter sofrido fortes pressões seletivas antrópicas visando certas características desejadas. Seu comportamento, portanto, nem sempre é representativo de plantas selvagens ou de outros tipos de habitat.Também deve ser ressaltado que, muitas vezes, as variações podem ser decorrentes do desenvolvimento foliar e/ou surgimento de novos órgãos concomitante a uma constância no conteúdo total de metabólitos secundários. Isto pode levar à menor concentração destes metabólitos por diluição, podendo, no entanto, resultar em maior quantidade total, devido ao aumento de biomassa 9,10 . Além disso, alguns dos fatores discutidos apresentam correlações entre si e não atuam isoladamente, podendo influir em conjunto no metabolismo secundário, como por ex.: desenvolvimento e sazonalidade; índice pluviométrico e sazonalidade; temperatura e altitude, entre outros. FATORES QUE INFLUENCIAM O CONTEÚDO DE M...

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“…There is a close connection between phenolics and proteins because phenylpropanoid-derived secondary metabolites are synthesized in the shikimate pathway and share a common precursor, phenylalanine, with protein synthesis. Phenolics serve many important functions in plants, such as structural support, herbivore defence and UV screening (Jones and Hartley 1999).…”

Section: Introductionmentioning

confidence: 99%

“…under nutrient limitation). (3) The protein competition model (PCM, Jones and Hartley 1999) states that since phenolics have a common precursor (phenylalanine, PHE) with proteins, there is a trade-off between protein and phenolic synthesis. When growth is not limited by nutrients, more PHE will be used for protein synthesis and, consequently, growth.…”

Section: Introductionmentioning

confidence: 99%

Phenolic content and growth of wetland macrophytes: Is the allocation to secondary compounds driven by nutrient availability?

Rejmánková

2015

Folia Geobot

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This study compares soluble phenolics and lignin content in two wetland macrophytes with contrasting life strategies grown under a varying nutrient supply in the field and in a greenhouse experiment. The differences are explained in terms of the protein competition model (PCM) hypothesis relating changes in secondary metabolites to changing nutrient limitation. The two study species, Eleocharis cellulosa (EC) and Typha domingensis (TD), are both widespread in tropical and subtropical freshwater and brackish marshes of the New World, and are often found in P-limited rather than Nlimited conditions. TD is a fast-growing competitor with large nutrient requirements. EC is a stress tolerator, quite well adapted to growth in nutrient-limiting environments. In both species, the concentration of phenolics was negatively correlated with increasing growth (due to increasing nutrient levels). This is in agreement with the PCM hypothesis, which predicts an increase in phenolic synthesis when protein synthesis (and consequently growth) is low due to limited resource availability. An interesting difference was found in the correlation between tissue nutrients and phenolics. TD from both the field and the greenhouse showed a negative correlation between tissue P and phenolics, while EC displayed a significant negative correlation between tissue N and phenolics. EC is adapted to low P, and increased tissue P content represents luxury consumption (uptake of P for storage) which is not reflected in increased growth and thus is not correlated with phenolics. These are the first steps in elucidating the relationship among nutrient availability, growth and phenolic content in two important primary producers of tropical and subtropical marshes.

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A Protein Competition Model of Phenolic Allocation

Cited by 366 publications

References 178 publications

Assessing the effects of ambient ozone in China on snap bean genotypes by using ethylenediurea (EDU)

Assessing the effects of ambient ozone in China on snap bean genotypes by using ethylenediurea (EDU)

Plantas medicinais: fatores de influência no conteúdo de metabólitos secundários

Phenolic content and growth of wetland macrophytes: Is the allocation to secondary compounds driven by nutrient availability?

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