Control at the level of substrate supply—an alternative in the regulation of phenylpropanoid accumulation in plant cells

Margna, Udo

doi:10.1016/s0031-9422(00)94321-8

Cited by 191 publications

(121 citation statements)

References 73 publications

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“…Close relationships between the contents of TP and FAA were found for five out of the seven submersed macrophytes but only two out of the eight floating-leaved and emergent macrophytes, indicating that FAA are more effective in regulating TP production of the submersed macrophytes than of the floating-leaved and emergent macrophytes. It has been suggested that synthesis of TP could be regulated by the availability of the amino acid phenylalanine rather than by the plant's carbohydrate status (Margna 1977, Lambers 1993. In the present study, we assumed FAA content as an indicator for phenylalanine contents in the plant's tissue (Gebauer et al 1998).…”

Section: Resultsmentioning

confidence: 99%

Relationships among the Contents of Total Phenolics, Soluble Carbohydrate, and Free Amino Acids of 15 Aquatic Macrophytes

Cao

Xie

et al. 2008

Journal of Freshwater Ecology

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In order to examine how carbon and nitrogen status of a macrophyte may affect its total phenolics (TP) production, the contents of free amino acids (FAA), soluble carbohydrate (SC) and TP were examined in leaves of seven submersed, four floating-leaved, and four emergent macrophytes. The floating-leaved and emergent macrophytes had much higher contents of SC and TP than the submersed macrophytes. The contents of FAA were not significantly different among the submersed, floating-leaved, and emergent macrophytes. Correlations among the contents of FAA, SC, and TP indicated that the production of TP was more dependent on the SC content than on the FAA content.

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Section: Resultsmentioning

confidence: 99%

Relationships among the Contents of Total Phenolics, Soluble Carbohydrate, and Free Amino Acids of 15 Aquatic Macrophytes

Cao

Xie

et al. 2008

Journal of Freshwater Ecology

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“…However, phenolic biosynthesis seems to be independent from the pool size of phenylalanine [17,18]. The results with variant cell lines of tobacco do not support the idea of a control at the level of sub strate supply as postulated by Margna [19]. W hether further work with variant cell lines may give clues about regulatory connections between prim ary and secondary metabolism remains to see [2 0 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of α-Aminooxy-β-phenylpropionic Acid on Phenylalanine Metabolism in p-Fluorophenylalanine Sensitive and Resistant Tobacco Cells

Berlin

Vollmer

1979

Zeitschrift Für Naturforschung C

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Amino acid analog resistant cell lines norm ally have an increased pool size o f the corresponding na tural amino acid due to a lessened feedback control in the biosynthetic pathway [1]. A tobacco cell line resistant to /7-fluorophenylalanine (PFP), however, did not fit into this frame [2-5], The m ain reason for the resistance was ascribed to a decreased uptake of all L-amino acids [5]. Some alterations in the m etab olism of phenylalanine may contribute to acquiring resistance, too. Phenylalanine am m onia lyase (PAL) activity of resistant cells was found to be 1 0 times the activity o f sensitive cells [3]. This resulted in 6 -1 0 times higher levels o f phenolic com pounds [4], of which more than 85% were identified as caffeoyl and feruloyl putrescine (unpublished). The pool sizes of all amino acids were found to be 3 -5 times lower in the resistant strain (unpublished). The decreased pool size o f phenylalanine in the resistant line did not fit with earlier observations [2 ] that chorismate mutase activity was less sensitive to feedback inhibi tion by phenylalanine and tyrosine.To get more insight into the regulation o f phenyl alanine biosynthesis in cultured tobacco cells, we tried to eliminate the deam ination o f phenylalanine. Materials and Methods Plant material

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“…N fertilization of particular plant species has been shown to cause a decrease in the production of polyphenols (Bryant et al, 1987). Margna (1977) noted that nutrient shortage could result in increasing activity of enzymes such as phenylalanine ammonialyase or increasing the supply of precursors of polyphenol synthesis. When nitrogen is in short supply, the phenylalanine could then be directly deaminated to reclaim its nitrogen for other purposes such as for conversion to more complex phenolics (Gershenzon, 1983).…”

Section: Effect Of Varying N Supply On Quality Of the Crop Residuesmentioning

confidence: 99%

N Mineralization from Residues of Crops Grown with Varying Supply of 15N Concentrations

Sholihah¹,

Prijono²,

Utami³

et al. 2012

JAS

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A laboratory study was conducted to evaluate the effects of varying 15 N concentrations on crop residue quality (rice straw=RS and soybean=SY) and N mineralization. Two crops (rice and soybean) were grown in a glass-house under four 15 N concentrations, i.e., 0 mM (N0), 0.625 mM (N1), 2.5 mM (N2) , and 10 mM (N3) supplied as CO( 15 NH 2 ) 2 , in 30 cm diameter plastic pots containing 5 kg of quartz sand. Eight weeks after planting the above-ground biomass was pruned and oven dried at 60 o C for 48 hours and analyzed for polyphenol, lignin, N, C, C/N, organic matter and % 15 N-abundance. Each of the eight crop residues produced from this experiment was then incorporated into 10 g of soil in a 50 ml plastic bottle. Mineralization of N from the residues was measured over a 14-week period under controlled non-leaching conditions.The results showed that increasing N concentration in the nutrient solution (0 to 10 mM) increased total N but decreased C, lignin and polyphenol content in the crop residues. The results suggested that N supply may increase the quality of the crop residues, as indicated by decreasing of C/N, lignin/N, polyphenol/N ratios. SY residue released N about 2x faster than RS residue, and the amount N released increased with increasing supply of the N concentration. At the 10 mM N supply, RS and SY residues released respectively 3734,857 mg kg -1 and 4352.34 mg kg -1 cumulative amount of mineral N with the mineralization rate about 7x faster than without 15 N in the solution. Differences in the %N mineralized were determined by the quality of the crop residues. Regression analyses showed that the N, lignin and polyphenol contents were the residues quality factors which could be used to predict N mineralization of the crop residues, and the relationship was best described by a linear regression.

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Control at the level of substrate supply—an alternative in the regulation of phenylpropanoid accumulation in plant cells

Cited by 191 publications

References 73 publications

Relationships among the Contents of Total Phenolics, Soluble Carbohydrate, and Free Amino Acids of 15 Aquatic Macrophytes

Relationships among the Contents of Total Phenolics, Soluble Carbohydrate, and Free Amino Acids of 15 Aquatic Macrophytes

Effects of α-Aminooxy-β-phenylpropionic Acid on Phenylalanine Metabolism in p-Fluorophenylalanine Sensitive and Resistant Tobacco Cells

N Mineralization from Residues of Crops Grown with Varying Supply of 15N Concentrations

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