Influence of Nitrogen Nutrition on the Utilization of L-Phenylalanine for Building Flavonoids in Buckwheat Seedling Tissues

Margna, Udo; Margna, Evi; VainjÄrv, Thu

doi:10.1016/s0176-1617(89)80030-6

Cited by 53 publications

(36 citation statements)

References 11 publications

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“…Of special importance for the growth and stability of plants is the phenolic polymer lignin. Significantly enhanced levels of lignin were only observed in roots at low nitrogen supply (5 mM NH 4 NO 3 ), indicating an increased allocation of carbon into the biosynthesis of several phenylpropanoids at limited nitrogen availability as previously discussed (Margna, Margna & Vainjärv 1989;Sanchez et al 2000). However, elevated CO 2 did not result in an overall increase of lignin, which has earlier been reported from other studies (Poorter et al 1997;Penuelas & Estiarte 1998).…”

Section: Elevated Co 2 Leads To Altered Profiles Of Secondary Metabolsupporting

confidence: 78%

Growth at elevated CO₂ concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN and to increased resistance against infection with potato virus Y

Matros¹,

Amme²,

Kettig³

et al. 2005

Plant Cell & Environment

151

106

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The effect of elevated CO 2 concentrations on the levels of secondary metabolites was investigated in tobacco plants grown under two nitrogen supply (5 and 8 m M NH 4 NO 3 ) and CO 2 conditions (350 and 1000 p.p.m.) each. High CO 2 resulted in a dramatic increase of phenylpropanoids in the leaves, including the major carbon-rich compound chlorogenic acid (CGA) and the coumarins scopolin and scopoletin at both nitrogen fertilizations. This was accompanied by increased PAL activity in leaves and roots, which was even higher at the lower nitrogen supply. Hardly any change was observed for the structural phenolic polymer lignin and the sesquiterpenoid capsidiol. In contrast, elevated CO 2 led to clearly decreased levels of the main nitrogen-rich constituent nicotine at the lower N-supply (5 m M NH 4 NO 3 ) but not when plants were grown at the higher N-supply (8 m M NH 4 NO 3 ). Inoculation experiments with potato virus Y (PVY) were used to evaluate possible ecological consequences of elevated CO 2 . The titre of viral coat-protein was markedly reduced in leaves under these conditions at both nitrogen levels. Since PR-gene expression and free salicylic acid (SA) levels remained unchanged at elevated CO 2 , we suggest that the accumulation of phenylpropanoids, for example, the major compound CGA and the coumarins scopolin and scopoletin may result in an earlier confinement of the virus at high CO 2 . Based on our results two final conclusions emerge. First, elevated CO 2 leads to a shift in secondary metabolite composition that is dependent on the availability of nitrogen. Second, changes in the pool of secondary metabolites have important consequences for plant-pathogen interactions as shown for PVY as a test organism.

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Section: Elevated Co 2 Leads To Altered Profiles Of Secondary Metabolsupporting

confidence: 78%

Growth at elevated CO₂ concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN and to increased resistance against infection with potato virus Y

Matros¹,

Amme²,

Kettig³

et al. 2005

Plant Cell & Environment

151

106

View full text Add to dashboard Cite

show abstract

“…protein precursors. When the shikimic acid pathway was examined, both theoretically (Margna 1977) and experimentally (Margna et al 1989), nitrogen-induced inhibition of phenolic production occurred, and supported the idea of competition between phenolics and proteins for their common precursor, L-phenylalanine. Specifically, they found two mechanisms: nitrogen-induced inhibition of the precursor production in some tissues, and in other tissues, phenylalanine was redistributed within the pathway.…”

Section: Discussionmentioning

confidence: 75%

Terpenes and phenolics in response to nitrogen fertilization: A test of the carbon/nutrient balance hypothesis

Muzika

1993

Chemoecology

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Abstract. Nitrogen fertilization resulted in a linear increase in the growth of Abies grandis seedlings, but linear decrease in foliage concentrations of phenolic compounds. These data are consistent with the inverse relationship between growth and production of carbonbased secondary chemicals predicted by the carbon/nutrient balance (CNB) hypothesis. However, in contrast to predictions of the CNB hypothesis, nitrogen fertilization had no effect on foliage terpene concentrations. The results suggest that not all carbon-based chemicals respond in the same manner to environmental variation, and that the carbon/nutrient balance hypothesis does not adequately explain all patterns of environmentally-induced variation in secondary metabolism.

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“…Thus, there appeared to be a stimulation of phenolic secondary chemicals under conditions of high carbohydrates combined with limited nutrients and low growth. In incubated hypocotyls of buckwheat, the production of flavonoids was inversely related to the availability of exogenous nitrogen supplied (Margna et al 1989), suggesting that phenylalanine is diverted to phenolic synthesis when nitrogen supply does not stimulate protein synthesis. It appears that in plant tissue and cell culture, low nutrient availability is often necessary for production of phenolic compounds (see for example, Takeda 1988) which can then be stimulated by sucrose application (Gbolade & Lockwood 1990).…”

Section: Carbon/nutrient Effects On Plant Qualitymentioning

confidence: 99%

The influence of plant carbon dioxide and nutrient supply on susceptibility to insect herbivores

Lincoln

1993

Vegetatio

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The carbon/nutrient ratio of plants has been hypothesized to be a significant regulator of plant susceptibility of leaf-eating insects. As rising atmospheric carbon dioxide stimulates photosynthesis, host plant carbon supply is increased and the accompanying higher levels of carbohydrates, especially starch, apparently 'dilute' the protein content of the leaf. When host plant nitrogen supply is limited, plant responses include increased carbohydrate accumulation, reduced leaf protein content, but also increased carbon-based defensive chemicals. No change, however, has been observed in the concentration of leaf defensive allelochemicals with elevated carbon dioxide during host plant growth. Insect responses to carbon-fertilized leaves include increased consumption with little change in growth, or alternatively, little change in consumption with decreased growth, as well as enhanced leaf digestibility, reduced nitrogen use efficiency, and reduced fecundity. The effects of plant carbon and nutrient supply on herbivores appear to result, at least in part, from independent processes affecting secondary metabolism.

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Influence of Nitrogen Nutrition on the Utilization of L-Phenylalanine for Building Flavonoids in Buckwheat Seedling Tissues

Cited by 53 publications

References 11 publications

Growth at elevated CO₂ concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN and to increased resistance against infection with potato virus Y

Growth at elevated CO₂ concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN and to increased resistance against infection with potato virus Y

Terpenes and phenolics in response to nitrogen fertilization: A test of the carbon/nutrient balance hypothesis

The influence of plant carbon dioxide and nutrient supply on susceptibility to insect herbivores

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Influence of Nitrogen Nutrition on the Utilization of L-Phenylalanine for Building Flavonoids in Buckwheat Seedling Tissues

Cited by 53 publications

References 11 publications

Growth at elevated CO2 concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN and to increased resistance against infection with potato virus Y

Growth at elevated CO2 concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN and to increased resistance against infection with potato virus Y

Terpenes and phenolics in response to nitrogen fertilization: A test of the carbon/nutrient balance hypothesis

The influence of plant carbon dioxide and nutrient supply on susceptibility to insect herbivores

Contact Info

Product

Resources

About

Growth at elevated CO₂ concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN and to increased resistance against infection with potato virus Y

Growth at elevated CO₂ concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN and to increased resistance against infection with potato virus Y