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'Phytoalexin' in keywords
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1Author    JohnL. InghamRequires cookie*
 Title    Trifolium hybridum and other Trifolium Species  
  Reference    (Z. Naturforsch. 31c, 331 [1976]; received January 14 1976) 
  Published    1976 
  Keywords    Leguminosae, Trijolium, Isoflavan, Pterocarpan, Phytoalexin 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0331_n.pdf 
 Identifier    ZNC-1976-31c-0331_n 
 Volume    31 
2Author    JohnL. InghamRequires cookie*
 Title    Induced Isoflavonoids from Fungus-Infected Stems of Pigeon Pea ( Cajanus cajan)  
 Abstract    Four antifungal isoflavones [7-hydroxy-4'-methoxy-(l) ; 5,7,4'-trihydroxy-(2) ; 5,7,2',4'-tetra-hydroxy-(3) ; 5,2',4'-trihydroxy-7-methoxy-(4) ] and one isoflavanone [ (5,2'-dihydroxy-7,4'-dimeth-oxy-(7)] have been isolated from the fungus-infected stems of C ajanus cajan . A sixth compound has been provisionally identified as 5,2'-dihydroxy-7,4'-dimethoxyisoflavone (5). The structure of 5,2'-dihydroxy-7,4'-dimethoxyisoflavanone (cajanol) was confirmed by synthesis from ferreirin (S^^'-trihydroxy^'-methoxyisoflavanone). 
  Reference    (Z. Naturforsch. 31c, 504 [1976]; received August 9 1976) 
  Published    1976 
  Keywords    Leguminosae, Cajanus, Isoflavone, Isoflavanone, Phytoalexin 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0504.pdf 
 Identifier    ZNC-1976-31c-0504 
 Volume    31 
3Author    Ulrich Lappe, Wolfgang BarzRequires cookie*
 Title    Degradation of Pisatin by Fungi of the Genus F u sa riu m  
 Abstract    Fifteen strains of Fusarium previously shown to degrade flavonoids and isoflavonoids were investigated for pisatin degradation. Fusarium anguioides and Fusarium avenaceum converted the phytoalexin (1) to the nontoxic 3,6a-dihy-droxy-8,9-methylenedioxypterocarpan (2). 
  Reference    Z. Naturforsch. 33c, 301 (1978); received February 21 1978 
  Published    1978 
  Keywords    Phytoalexin, Pisatin, Fusarium, Degradation, Demethylation 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0301_n.pdf 
 Identifier    ZNC-1978-33c-0301_n 
 Volume    33 
4Author    JohnL. InghamRequires cookie*
 Title    Phytoalexin Production by Flowers of Garden Pea (P isu m sa tivu m )  
 Abstract    The isoflavonoid phytoalexin pisatin has been isolated from fungus-inoculated petals of 16 Pisum sativum cultivars. Pisatin was usually accompanied by trace quantities of maackiain. No other fungitoxic compounds were detected. 
  Reference    Z. Naturforsch. 34c, 296 (1979); received December 4 1978 
  Published    1979 
  Keywords    Leguminosae, Pisum, Isoflavonoids, Pterocarpans, Phytoalexin 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0296_n.pdf 
 Identifier    ZNC-1979-34c-0296_n 
 Volume    34 
5Author    A. Kio, K. Obayashi, K. Ohki, A. Kiyam, K. Azuyoshi, K. Aw AzuRequires cookie*
 Title    Partially N-Deacetylated Chitin Fragments are Strong Elicitors for (+)-Pisatin Induction in Epicotyls of Pea  
 Abstract    Chitosan derivatives classed into three groups according to their molecular size were exam­ ined for the relationships between degree of N -acetylation and phytoalexin (+)-pisatin-induc-ing activity in pea epicotyl assay. Partially N-deacetylated chitin with degree o f N-acetylation 56% (DAC 56%) was the most potent inducer o f (+)-pisatin am ong sparingly water-soluble polysaccharides including chitosan (degree o f N -acetylation 0%), DAC 32%, and chitin. Among the intermediate-sized molecules obtained from degradation of the chitosan and the DACs by N a N 0 2, the chitosan fragment was the most powerful elicitor for (+)-pisatin induc­ tion. The N a N 0 2-degraded DAC 56% exhibited a com parable activity to the N a N 0 2 -degrad-ed chitosan at low concentrations. The N a N 0 2-degraded fragments as well as the native poly­ mer induced a relatively high am ount of (+)-pisatin, while the acetone precipitate of chitosan oligomers from the HCl-catalyzed hydrolysate and their partially N-acetylated derivatives ex­ hibited a m oderate (+)-pisatin-inducing activity. These findings suggest the possibility that partially N-deacetylated chitin fragments could be one o f the most promising elicitors in the pea system. 
  Reference    Z. Naturforsch. 49c, 302—308 (1994); received January 14/February 24 1994 
  Published    1994 
  Keywords    Elicitor, Chitosan, Chitin Pea, Phytoalexin 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0302.pdf 
 Identifier    ZNC-1994-49c-0302 
 Volume    49 
6Author    JohnL. InghamRequires cookie*
 Abstract    Peroxide oxidation of cajanol ethyl ether afforded the B ring derived product, 2-methoxy-4-ethoxybenzoic acid. For­ mation of this compound means that the structure of cajanol, a major phytoalexin from Cajanus cajan, must be revised to 5,4'-dihydroxy-7,2'-dimethoxyisoflavanone. 
  Reference    Z. Naturforsch. 34c, 159 (1979); received September 5 1978 
  Published    1979 
  Keywords    Leguminosae, Cajanus, Phytoalexin, Isoflavanone, Structure Revision 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0159_n.pdf 
 Identifier    ZNC-1979-34c-0159_n 
 Volume    34 
7Author    PaulM. Dewick, M. Elanie, J. Steele, RichardA. Dixon, IanM W HiteheadRequires cookie*
 Title    Biosynthesis of Isoflavonoid Phytoalexins: Incorporation of Sodium |1,2-13C2] Acetate into Phaseollin and Kievitone  
 Abstract    13C-NMR analysis of the isoflavonoid phytoalexins phaseollin and kievitone produced by feeding sodium [l,2-13C2]acetate to wounded bean (Phaseolus vulgaris) cotyledons has demon­ strated the incorporation of intact acetate units into the aromatic A rings. Phaseollin shows a specific folding of the polyketide chain, whereas kievitone exhibits a randomisation of label in accordance with the intermediacy of a 2',4',6'-trihydroxylated chalcone during its formation. In neither case was sufficient label incorporated into analysis. 
  Reference    Z. Naturforsch. 37c, 363—368 (1982); received February 18 1982 
  Published    1982 
  Keywords    Biosynthesis, 13C-NMR, Phytoalexin, Phaseollin, Kievitone, Isoflavonoid 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0363.pdf 
 Identifier    ZNC-1982-37c-0363 
 Volume    37 
8Author    KenjiM. Onde, Mitsuo Takasugi, JennyA. Lewis, G.Roger FenwickRequires cookie*
 Title    Time-Course Studies of Phytoalexins and Glucosinolates in UV-Irradiated Turnip Tissue  
 Abstract    Sliced turnip root (Brassica campestris L. ssp rapa) was irradiated for a total o f 20 min with a 15 W germicidal lamp and the tissue incubated at 25 °C. The effects o f such treatment on indole phytoalexins (methoxybrassinin (I); brassinin (II); cyclobrassinin (III); spirobrassinin (IV) and glucosinolates were determined using high performance liquid chromatography procedures. Accumulation o f phytoalexins I-I I I was evident within 8 h o f irradiation, whilst form ation o f spirobrassinin was evident only after 24 h. M aximal levels o f III and IV (> 100 |ig g " 1 freeze dried tissue) were greater than those o f I and II (27 and 17 jag g ~ \ respec­ tively). The individual glucosinolate levels were affected in a complex manner; whilst most glu-coinolates decreased on storage, the levels o f indole glucosinolates, glucobrassicin (XI) and 1-methoxyglucobrassicin (XIII), increased until 5 to 6 days after irradiation and thereafter declined. Whilst structural features o f I-IV , XI and XIII suggest close biosynthetic relation­ ships between these classes o f biologically-active indoles, further studies are needed to estab­ lish this point unambiguously. 
  Reference    Z. Naturforsch. 46c, 189—193 (1991); received October 11 1990/February 4 1991 
  Published    1991 
  Keywords    G lucosinolate, Phytoalexin, Turnip, UV Irradiation 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0189.pdf 
 Identifier    ZNC-1991-46c-0189 
 Volume    46 
9Author    Kohki Akiyamaa, Kazuyoshi Kawazua, Akio KobayashibRequires cookie*
 Title    Partially N-Deacetylated Chitin Oligomers (Pentamer to Heptamer) are Potential Elicitors for (+)-Pisatin Induction in Pea Epicotyls  
 Abstract    Oligomers (dimer to heptamer) of chitosan and their partially/completely N-acetylated derivatives were examined for (+)-pisatin-inducing activities in pea epicotyl elicitor assay at concentrations ranging from 6.25 to 100 j.ig/ml. The structures of the oligomers were analyzed by 'H NM R and M A L D I TOF MS spectrometers. The chitosan oligomers from dimer to tetramer were inactive, while the pentamer exhibited a moderate activity at 100 |ig/ml. The hexamer showed a pronounced activity at 100 |ag/ml, whereas the oligomer had no activity at the higher concentrations. Although the chitosan heptamer induced a moderate amount of (+)-pisatin (ca. 60 j.ig/g fr. wt.) at 50 (.ig/ml, the oligomer did not elicit pisatin formation at 100 |ig/ml. The dimer to tetramer of both partially N-deacetylated chitin (DAC) and chitin were totally inactive. The DAC pentamers (d.a. 31%, 52%), DAC hexamers (d.a. 26%, 41%), and DAC heptamers (d.a. 26%, 36%) exhibited significant elicitor activities at lower concen­ trations (6.25-25 [.ig/ml) than the native chitosan oligomers. The chitin pentamer to heptamer had weak or no activity. Both glucosamine and N-acetylglucosamine were inactive in the assay. These facts suggest that the DAC pentamer to heptamer may act as elicitors for pisatin induction in pea-fungus interactions. 
  Reference    Z. Naturforsch. 50c, 391—397 (1995); received January 4/January 15 1995 
  Published    1995 
  Keywords    Elicitor, Chitosan, Chitin, Phytoalexin, Pisum sativum 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0391.pdf 
 Identifier    ZNC-1995-50c-0391 
 Volume    50 
10Author    Bruno Wolters, U. Do EilertRequires cookie*
 Title    Acridonepoxidgehalte in Kalluskulturen von Ruta graveolens und ihre Steigerung durch Mischkultur mit Pilzen.* Accumulation of Acridone-Epoxides in Callus C ultures o f Ruta graveolens Increased by Coculture with Not Host-Specific Fungi  
 Abstract    The classic attempt to find optimum culture conditions lead to hormonautotrophic cultures and to dark grown cultures. We made the new attempt to rise the yield o f rutacridone-epoxides by co­ culture with not hostspecific fungi. Conditions were chosen that only diffusible elicitors could in­ fluence callus tissue. 14 days of coculture mostly caused reduced acridone-epoxide content, growthrate and up to total disappearance of chlorophyll. Within 3 — 7 days o f coculture some fun­ gi induced a significant rise of acridone-epoxide content (up to 50-fold). Culture filtrates o f these fungi showed comparable effects. Our results proved the acridone-epoxides to be phytoalexins. The use o f fungal elicitors could be a new method to increase secondary product accumulation in tissue culture. 
  Reference    Z. Naturforsch. 37c, 575 (1982); received March 22 1982 
  Published    1982 
  Keywords    Acridone-Epoxide, Cell Culture, Coculture with Fungi, Phytoalexin, Ruta graveolens 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0575.pdf 
 Identifier    ZNC-1982-37c-0575 
 Volume    37