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  1. Article: Updated synopsis of Acalypha (Euphorbiaceae, Acalyphoideae) from Brazil

    Cardiel, José M. / de Sousa, Ana Angelica Cordeiro / Cordeiro, Inês / Caruzo, Maria Beatriz Rossi / da Silva, Otávio Luis Marques / Muñoz-Rodríguez, Pablo / López, Alba / Montero-Muñoz, Iris

    Plant systematics and evolution. 2022 Aug., v. 308, no. 4

    2022  

    Abstract: A critical taxonomic and nomenclatural review of the Brazilian species of Acalypha (Euphorbiaceae, Acalyphoideae) is presented. As a result, 40 species (44 taxa including six subspecies) are accepted, 37 of them native (17 endemic) and three introduced; ... ...

    Abstract A critical taxonomic and nomenclatural review of the Brazilian species of Acalypha (Euphorbiaceae, Acalyphoideae) is presented. As a result, 40 species (44 taxa including six subspecies) are accepted, 37 of them native (17 endemic) and three introduced; also, 132 names are considered synonyms, 28 of them for the first time. Two new combinations are proposed: Acalypha brasiliensis subsp. asterotricha and A. brasiliensis subsp. psilophylla, previously considered varieties of A. brasiliensis. Information about types is provided for all the valid names, and 54 lectotypes and one neotype are designated. Identification keys and detailed distribution maps of all the native taxa are also provided.
    Keywords Acalypha ; evolution ; lectotypes ; neotypes ; plant taxonomy ; Brazil
    Language English
    Dates of publication 2022-08
    Size p. 24.
    Publishing place Springer Vienna
    Document type Article
    ZDB-ID 1463027-8
    ISSN 1615-6110 ; 0378-2697
    ISSN (online) 1615-6110
    ISSN 0378-2697
    DOI 10.1007/s00606-022-01816-0
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Pollen morphology of Croton of the New World and pollen evolution of tribe Crotoneae (Euphorbiaceae)

    de Souza, Lidian Ribeiro / da Silva, Otávio Luis Marques / dos Santos, Francisco de Assis Ribeiro / Carneiro-Torres, Daniela Santos

    Review of palaeobotany and palynology. 2020 Oct., v. 281

    2020  

    Abstract: Croton has ca. 1200 species and a pantropical distribution, representing the second largest genus in Euphorbiaceae. In this work, we aim to characterize morphologically the pollen grains of 105 species of Croton, besides other representatives of tribe ... ...

    Abstract Croton has ca. 1200 species and a pantropical distribution, representing the second largest genus in Euphorbiaceae. In this work, we aim to characterize morphologically the pollen grains of 105 species of Croton, besides other representatives of tribe Crotoneae, to provide palynological data sustaining its current delimitation and classification and understand how pollen grains evolved in the tribe. Floral buds were obtained from specimens and then acetolyzed, measured and described under light and scanning electronic microscopy. Pollen grains analyzed are medium to large, spherical, apolar, inaperturate and have the sexine thicker than the nexine. The Croton pattern is composed of pila or spine as ornamentation subunits, whose surface may be psilate, plicate or striate. Data on type, disposition, and distribution of sexine elements in the lumen of the rosettes are important to distinguish species. The spine Croton pattern has a single origin in Croton and is derived from the pilum type. Our study corroborates the stenopalynous status of Crotoneae since palynological features are highly conserved in the tribe. On the other hand, we point to the potential of the configuration of ornamentation units associated with the diameter of pollen grains to understand pollen evolution in the tribe.
    Keywords Croton ; evolution ; nexine ; paleobotany ; palynology ; pollen ; pollen morphology ; sexine
    Language English
    Dates of publication 2020-10
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ISSN 0034-6667
    DOI 10.1016/j.revpalbo.2020.104279
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Allelopathic activity and chemical constituents of extracts from roots of Euphorbia heterophylla L

    da Silva, Ueveton Pimentel / Furlani, Gabriela Milane / Demuner, Antônio Jacinto / da Silva, Otávio Luis Marques / Varejão, Eduardo Vinícius Vieira

    Natural product research. 2019 Sept. 17, v. 33, no. 18

    2019  

    Abstract: Euphorbia heterophylla L. is regarded as a major weed worldwide. Its high aggressiveness in agricultural environment prompted us to investigate the allelopatic activity and chemical constitution of extracts from roots of this plant. Hexane extract showed ...

    Abstract Euphorbia heterophylla L. is regarded as a major weed worldwide. Its high aggressiveness in agricultural environment prompted us to investigate the allelopatic activity and chemical constitution of extracts from roots of this plant. Hexane extract showed low phytotoxic activity. Methanol extract at 2.0 mg mL−1 inhibited 100% of germination, root and shoot growth of the indicator plants Sorghum bicolor and Lactuca sativa. β-sitosterol, stigmasterol, and esters of lupeol, germanicol, taraxasterol, pseudotaraxasterol, α-amyrin and β-amyrin were isolated from the hexane extract and their structures elucidated on the basis of MS and 1H, 13C and DEPT-135 NMR data. GC-MS analysis of the derivatized methanol extract allowed for identifying a series of allelopathic organic acids potentially involved in allelopathic interactions of E. heterophylla. This is the first study on the allelopathic activity of extracts and identification of metabolites from roots of E. heterophylla.
    Keywords Euphorbia heterophylla ; Lactuca sativa ; Sorghum bicolor ; allelopathy ; beta-sitosterol ; chemical composition ; esters ; gas chromatography-mass spectrometry ; germination ; hexane ; indicator species ; lupeol ; metabolites ; methanol ; nuclear magnetic resonance spectroscopy ; organic acids and salts ; phytotoxicity ; roots ; shoots ; stigmasterol ; weeds
    Language English
    Dates of publication 2019-0917
    Size p. 2681-2684.
    Publishing place Taylor & Francis
    Document type Article
    ZDB-ID 2185747-7
    ISSN 1478-6427 ; 1478-6419
    ISSN (online) 1478-6427
    ISSN 1478-6419
    DOI 10.1080/14786419.2018.1460829
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  4. Article ; Online: Allelopathic activity and chemical constituents of extracts from roots of

    da Silva, Ueveton Pimentel / Furlani, Gabriela Milane / Demuner, Antônio Jacinto / da Silva, Otávio Luis Marques / Varejão, Eduardo Vinícius Vieira

    Natural product research

    2018  Volume 33, Issue 18, Page(s) 2681–2684

    Abstract: Euphorbia ... ...

    Abstract Euphorbia heterophylla
    MeSH term(s) Allelopathy ; Euphorbia/chemistry ; Gas Chromatography-Mass Spectrometry ; Germination/drug effects ; Hexanes/chemistry ; Lactuca/drug effects ; Lactuca/growth & development ; Magnetic Resonance Spectroscopy ; Methanol/chemistry ; Molecular Structure ; Oleanolic Acid/analogs & derivatives ; Oleanolic Acid/analysis ; Pheromones/chemistry ; Pheromones/pharmacology ; Plant Extracts/chemistry ; Plant Extracts/pharmacology ; Plant Roots/chemistry ; Plant Roots/drug effects ; Plant Roots/growth & development ; Sorghum/drug effects ; Sorghum/growth & development ; Sterols/analysis ; Sterols/chemistry ; Triterpenes/analysis ; Triterpenes/chemistry
    Chemical Substances Hexanes ; Pheromones ; Plant Extracts ; Sterols ; Triterpenes ; taraxasterol (64SK2ERN9P) ; Oleanolic Acid (6SMK8R7TGJ) ; beta-amyrin (KM8353IPSO) ; Methanol (Y4S76JWI15)
    Language English
    Publishing date 2018-04-09
    Publishing country England
    Document type Journal Article ; Video-Audio Media
    ZDB-ID 2185747-7
    ISSN 1478-6427 ; 1478-6419
    ISSN (online) 1478-6427
    ISSN 1478-6419
    DOI 10.1080/14786419.2018.1460829
    Database MEDical Literature Analysis and Retrieval System OnLINE

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