Die Alkaloide

Mothes, K.; Romeike, A.

doi:10.1007/978-3-642-94733-9_39

Cited by 6 publications

(2 citation statements)

References 152 publications

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“…Careful examination of N. rustica scions on tomato stock revealed that traces of alkaloids were present. 43 When possible error arising from the alkaloid present in the scion at the time of the graft was eliminated by grafting young tobacco embryos onto tomato, a significant amount of nicotine was still found44 in the tobacco scion. While these experiments certainly were indicative of synthesis of nicotine in the shoot, criticisms were raised which prevented them from being accepted as conclusive proof.…”

Section: Discussionmentioning

confidence: 99%

The Biosynthesis of Nicotine in Nicotiana glutinosa from Carbon-14 Dioxide

Alworth¹,

Selms²,

Rapoport³

1964

J. Am. Chem. Soc.

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Section: Discussionmentioning

confidence: 99%

The Biosynthesis of Nicotine in Nicotiana glutinosa from Carbon-14 Dioxide

Alworth¹,

Selms²,

Rapoport³

1964

J. Am. Chem. Soc.

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“…At present, we assume that nicotine and related compounds, which are known to be transported through the xylem vessels of tobacco plants (2), are metabolized by The biosynthesis of the oligosaccharide part of the Digitalis glycosides is far from being elucidated, especially with regard to the formation of deoxy-sugars, like digitoxose.…”

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confidence: 99%

Uptake and Metabolism of Host Plant Alkaloids by ParasitizingCuscutaSpecies

Bäumel¹,

Witte²,

Proksch³

et al. 1992

Planta Med

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Parasitic plants of the genus Cuscuta (Cuscutaceae) including C. platyloba Progel and C. reflexci Roxb., which are usually alkaloid-free, are able to grow on a plethora of alkaloid-producing host plants such as Duboisia myoporoides R. Br. (Solanaceae), Lupinus albus (Fabaceae), and Nicotiana xanthi (Solanaceae). During parasitism alkaloids of the host plants are accumulated by the parasites as shown for the examples of L. albus and C. platyloba (1). The quinolizidine alkaloids of L. albus are passed on to the parasite through the "haustoria" which tap the xylem and phloem vessels of the host, as has been revealed by microscopical analysis of cross-sections of C. reflexa infesting L. albus. The highest concentrations of host plant alkaloids in the parasite are usually found in the haustorial region (up to l7mg/g dry weight, calculated as sparteine), the alkaloid pattern closely resembling that of the host. The concentrations of alkaloids decrease towards the shooting tip of the parasite (2mg/dry dw). Alkaloid esters such as 13-O-cinnamoyllupanine present in the host plant as well as in the haustorial region of the parasite likewise tend to decrease towards the shooting tip of Cuscuta which is characterized by 13-hydroxylupanine as sole detectable alkaloid. Similar results are obtained with D. myoporoides as host plant with regard to tropane alkaloids. Large concentrations of, e.g. scopolamine or hyoscyamine, are detected in parasitizing C. platyloba. However only traces of tobacco alkaloids including nornicotine and anabasine are detected in the parasite even though these compounds are the main alkaloids of D. myoporoides. C. reflexa and C. platyloba growing on N. xanthi likewise yielded only traces of nicotine and related compounds (20-4Opg/g dw) although these alkaloids are present in the host plant in appreciable quantities (up to 5 mg/g dw).At present, we assume that nicotine and related compounds, which are known to be transported through the xylem vessels of tobacco plants (2), are metabolized by Cuscuta species following uptake via the haustoria. Further studies aiming at determination of the fate of nicotine in Cuscuta species are now in progress.Financial support by the Deutsche Forschungsgemeinschaft is gratefully acknowledged.

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Introduction

Robinson¹

1968

The Biochemistry of Alkaloids

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Die Alkaloide

Cited by 6 publications

References 152 publications

The Biosynthesis of Nicotine in Nicotiana glutinosa from Carbon-14 Dioxide

The Biosynthesis of Nicotine in Nicotiana glutinosa from Carbon-14 Dioxide

Uptake and Metabolism of Host Plant Alkaloids by ParasitizingCuscutaSpecies

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