Daffodil Narcissus pseudonarcissus

In 1956, the alkaloid Methylpseudolycorine (101) isolated from the King Alfred daffodil (Narcissus pseudonarcissus L.) was oxidized to the pale yellow chloride with selenium dioxide (Scheme 36). Conversion into the betaine was accomplished by aqueous ammonia to give yellow prisms of the trihydrate of Criasbetaine (100) (56JA4145, 56JA4151). The UV absorption... 

Burkhardt, RK. et al.. Transgenic rice (Oryza sativa) endosperm expressing daffodil (Narcissus pseudonarcissus) phytoene synthase accumulates phytoene, a key intermediate of provitamin A biosynthesis. Plant J. 11, 1071, 1997. 

Extracted from the bulbs of the daffodil, Narcissus pseudonarcissus Patient/Family Education... 

Daffodil Narcissus pseudonarcissus CNS depression, miotic, coma, salivation, vomiting, death... 

Gude M, Hausen BM, Heitsch H, Konig WA (1988) An investigation of the irritant and allergenic properties of daffodils Narcissus pseudonarcissus L., Amaryllidaceae). Contact Dermatitis 19 1-10... 

Lycorine (69) was recognized as a potent emetic and a moderately toxic base from the time of its initial isolation from Narcissus pseudonarcissus E. (in about 1877) (48). Since that time its isolation from many other AmaryUidaceae, for example, Lpcom radiate Herb., has served to estabUsh it as the most cosmopohtan alkaloid of the family. TypicaUy, as much as 1% of the dry weight of daffodil bulbs may consist of lycorine (69), which has been reported to... 

A cell-free system from photosynthetically active species has to be developed that is able to produce substantial amounts of intermediates and desaturated carotenes. Noteworthy a recent report using isolated chromoplasts from daffodil flowers. Narcissus pseudonarcissus > and isopentenyl pyrophosphate as substrate noted increased levels of phytoene and geranylgeraniol vs. control in the presence of high concentration (50 j,M) of SAN 6706 (27). These cell-free assays should be investigated further with regard to possible different sensitivity against inhibitors because of the species used. 

In vitro, daffodil chromoplasts (Narcissus pseudonarcissus L.) synthesize... 

Chromoplasts from the daffodil flower (Narcissus pseudonarcissus) are well suited for in vitro investigations on the biosynthesis of tetraterpenoid carotenes. Soluble enzymes of the chromoplast stroma convert the hydrophilic substrate isopen-tenyl diphosphate (IPP) to the liphophilic and membrane associated phytoene, further carotenes are then formed by integrate membrane enzymes (Beyer et al. 1980). 

Daffodil chromoplasts (Narcissus pseudonarcissus L.) convert I I-phytoene in more desaturated and cyclic carotenes. Recently, we succeeded in the dissection in vitro of these membrane bound reactions into three independent segments, the desaturation of phytoene to -carotene, the desaturation of... 

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