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Showing papers in "Phytochemistry in 1981"


Journal ArticleDOI
TL;DR: In this paper, the authors present a mathematical model to predict the overall isotope discrimination in terms of diffusion, interconversion, incorporation, and respiration in C 3, C 4 and crassulacean acid metabolism (CAM) photosynthetic pathways.

2,065 citations


Journal ArticleDOI
TL;DR: A new type of higher plant alkaloid, 1,6,7,8-tetrahydroxyoctahydroindolizine, designated castanospermine, has been isolated from the toxic seeds of the Australian legume Castanospermum australe.

349 citations


Journal ArticleDOI
TL;DR: Evaluation of data reveals a correlation in most cases between the occurrence of flavonoid aglycones, the presence of secretory structures and the production of other lipophilic plant products.

319 citations


Journal ArticleDOI
TL;DR: In this article, two phytoalexins were isolated as chromatographically homogeneous amorphous solids from UV-irradiated, dark-grown rice coleoptiles.

182 citations


Journal ArticleDOI
TL;DR: In this article, the chemical shift for C-9 in a range of substituted compounds is shown to be numerically related to the stereochemistry at C-8, which allows the determination of the configuration at this centre for most types of substitution patterns by calculation of the C- 9 shift using increments for each substituent.

173 citations


Journal ArticleDOI
TL;DR: Most flavonoids, including a number of dihydrochalcones related to phloretin, showed strong deterrency at concentrations well within the range often found in plants, and flavanone and flavone glycosides showed weak feeding deterrency relative to their corresponding aglycones.

152 citations


Journal ArticleDOI
TL;DR: The mucilage isolated from Opuntia is shown to contain arabinose, galactose, Galacturonic acid, rhamnose and xylose It has a uronic acid content of ca 10% and a MW of 43 × 106.

146 citations


Journal ArticleDOI
TL;DR: It is proposed that the distribution of aphids on leaves of different ages is regulated by the hydroxamic acid content, which is always higher in the younger leaves.

130 citations


Journal ArticleDOI
TL;DR: In this article, 14 depsipeptides have been isolated from the culture medium of a strain of Metarhizium anisopliae and five of them were identified as known destruxins A, B, C, D and desmethyldestruxin B.

129 citations


Journal ArticleDOI
TL;DR: This resistance to degradation shown by the cutin derived acids (α,ω-dibasic, ω-hydroxy and long-chain monobasic acids) relative to the cellular and wax derived lipids may allow these cutin components to be used as quantitative markers of A. marina in mangrove associated sediments.

127 citations


Journal ArticleDOI
TL;DR: The evidence that light appears to be involved in ureide assimilation in green tissues suggests that different regulatory mechanisms may exist in plants compared with micro-organisms.

Journal ArticleDOI
TL;DR: The seed globulins of Lupinus albus were extracted and 12 ditterent proteins were separated: four of them correspond to vicilins and two to legumin.

Journal ArticleDOI
TL;DR: Haematococcus pluvialis cultivated in a N-deficient medium produced astaxanthin (1 % of total carotenoids), the monoester (76 %) and diester (7 %) of astaxantin, β,β-carotene (1%)), an adonirubin ester (3 %), (3R,3′R,6′R)-lutein (7%), violaxanthins (2%), and neoxanthin(1%) as mentioned in this paper.

Journal ArticleDOI
TL;DR: The exceptional colour stability near neutrality of the Zebrina anthocyanin is related both to a high value of the acidity constant and to the total absence of formation of the colourless pseudobase and chalcone.

Journal ArticleDOI
TL;DR: Evidence of 3′: 5′-cyclic nucleotide phosphodiesterases in higher plants, together with adenylate cyclase, a specific cyclic AMP binding protein, and calmodulin means that plants possess all the necessary components for a functional cyclicAMP-regulated system.

Journal ArticleDOI
TL;DR: In this paper, mass spectral data on 105 pentacyclic triterpenoids have been collated and analysed from which it has been possible to identify base peaks which are characteristic of specific stereoskeletons.

Journal ArticleDOI
TL;DR: In this paper, the authors show that the presence of a 3-hydroxyl group in the flavonoid molecule has little effect on the complex-forming ability and the nature of the sugar substituent has no influence on the reaction.

Journal ArticleDOI
TL;DR: Pratorinine is a new phenanthridone alkaloid and anhydrolycorin-7-one was known before only as a synthetic compound and the physiological significance of hippadine is appraised.

Journal ArticleDOI
TL;DR: The polyamines spermidine and spermine inhibited ethylene production induced by the application of 1-aminocyclopropane-1-carboxylic acid and they also reduced the endogenous content of this amino acid in the treated tissues.

Journal ArticleDOI
TL;DR: From the rhizomes of Alpinia speciosa, a new dihydrochalcone, diHydroflavokawin B, has been isolated together with six known phenolic compounds and the chemotaxonomic significance of these findings is discussed briefly.

Journal ArticleDOI
TL;DR: Evidence is presented which shows that NH 3 assimilation in Chlamydomonas occurs exclusively via the glutamate synthase cycle in illuminated and darkened cells and those in which the internal level of NH 3 is elevated, indicating that glutamate dehydrogenase probably plays a catabolic rather than anabolic role in the N nutrition of the alga.

Journal ArticleDOI
TL;DR: Several new 4α-methyl sterols with unusual unsaturation in the Δ 8(14) or Δ 14 -positions, such as 4α,24 S -dimethyl-5α-cholest-8 (14)-en-3β-ol, 4αmethyl-24ξ-ethyl-methyl-5 α-choline-8(14)-EN-3 β-ol and 14-dehydrodinosterol, have been isolated from extracts of the cultured marine dinoflagellates Amphidinium carterae

Journal ArticleDOI
TL;DR: The complete amino acid sequence of one of the major wheat protein iso-inhibitors of α-amylase was determined from analysis of fragments and peptides derived from the protein by cleavage with cyanogen bromide and by digestion with trypsin, chymotrypsin , thermolysin and the Staphylococcus aureus V8 protease.

Journal ArticleDOI
TL;DR: In this article, potato cells were fractionated by successive extractions with water at 80°, 0.2 M (NH 4 ) 2 C 2 O 4 at 80, 1 M and 4 M KOH, to leave a residue of α-cellulose.

Journal ArticleDOI
TL;DR: In this article, the IR studies of four proanthocyanidin dimers and all four 4-(2′,4′,6′-trihydroxyphenyl) derivatives of the flavan monomer units of ProanthOCYCLIDIN were carried out.

Journal ArticleDOI
TL;DR: Bioassay directed fractionation of the waxy fractions derived from the fruit of Amorpha fruticosa resulted in the isolation of amorfrutin A and B, active new antimicrobial agents, which were found to be new bibenzyl metabolites.

Journal ArticleDOI
TL;DR: This is the first report of 2-allosylglucose as a disaccharide unit of flavonoid, and the related isoscutellarein glycoside is also present.

Journal ArticleDOI
TL;DR: The wood of Alnus japonica has been shown to contain a number of biarylheptanoids as well as other phenolics, including secoisolariciresinol diferulate, which may have biosynthetic significance.

Journal ArticleDOI
TL;DR: Isoformononetin, glyceollins I, II and 2-isopentenyl-3,6a,9-trihydroxypterocarpan (glyceocarpin) accumulated in soybean leaves after treatment with aqueous sodium iodoacetate or a cell suspension of the bacterium, Pseudomonas pisi.

Journal ArticleDOI
TL;DR: Three phytoalexins were isolated from groundnut seeds which had been sliced and incubated for 48 hours at 25† as mentioned in this paper, and two were novel isoprenylated stilbene derivatives.