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Sylvie Derridj - One of the best experts on this subject based on the ideXlab platform.

  • Species-specific composition of free amino acids on the leaf surface of fourSenecio species
    Journal of Chemical Ecology, 1996
    Co-Authors: Leo L. Soldaat, Jean-pierre Boutin, Sylvie Derridj
    Abstract:

    The specificity of the chemical composition of the leaf surface of four Senecio species was studied in order to understand the host selection of Tyria jacobaeae , a monophagous moth that has Senecio jacobaea as its principal host plant. Pyrrolizidine alkaloids characteristic for Senecio species were not detected in water and sulfuric acid extracts of the leaf surface of Senecio jacobaea . Water extracts of the leaf surfaces of S. jacobaea, S. vulgaris, S. viscosus , and S. sylvaticus contained low concentrations of free amino acids. The proportions of these amino acids were very different from those inside the leaf tissues. In a discriminant analysis, the four species could be completely separated on the basis of the relative proportions of amino acids on the leaf surface.

  • Species-specific composition of free amino acids on the leaf surface of four Senecio species
    Journal of Chemical Ecology, 1996
    Co-Authors: Leo L. Soldaat, Jean-pierre Boutin, Sylvie Derridj
    Abstract:

    The specificity of the chemical composition of the leaf surface of four Senecio species was studied in order to understand the host selection of Tyria jacobaeae, a monophagous moth that has Senecio jacobaea as its principal host plant. Pyrrolizidine alkaloids characteristic for Senecio species were not detected in water and sulfuric acid extracts of the leaf surface of Senecio jacobaea. Water extracts of the leaf surfaces of S. jacobaea, S. vulgaris, S. viscosus, and S. sylvaticus contained low concentrations of free amino acids. The proportions of these amino acids were very different from those inside the leaf tissues. In a discriminant analysis, the four species could be completely separated on the basis of the relative proportions of amino acids on the leaf surface.

Leo L. Soldaat - One of the best experts on this subject based on the ideXlab platform.

  • Species-specific composition of free amino acids on the leaf surface of fourSenecio species
    Journal of Chemical Ecology, 1996
    Co-Authors: Leo L. Soldaat, Jean-pierre Boutin, Sylvie Derridj
    Abstract:

    The specificity of the chemical composition of the leaf surface of four Senecio species was studied in order to understand the host selection of Tyria jacobaeae , a monophagous moth that has Senecio jacobaea as its principal host plant. Pyrrolizidine alkaloids characteristic for Senecio species were not detected in water and sulfuric acid extracts of the leaf surface of Senecio jacobaea . Water extracts of the leaf surfaces of S. jacobaea, S. vulgaris, S. viscosus , and S. sylvaticus contained low concentrations of free amino acids. The proportions of these amino acids were very different from those inside the leaf tissues. In a discriminant analysis, the four species could be completely separated on the basis of the relative proportions of amino acids on the leaf surface.

  • Species-specific composition of free amino acids on the leaf surface of four Senecio species
    Journal of Chemical Ecology, 1996
    Co-Authors: Leo L. Soldaat, Jean-pierre Boutin, Sylvie Derridj
    Abstract:

    The specificity of the chemical composition of the leaf surface of four Senecio species was studied in order to understand the host selection of Tyria jacobaeae, a monophagous moth that has Senecio jacobaea as its principal host plant. Pyrrolizidine alkaloids characteristic for Senecio species were not detected in water and sulfuric acid extracts of the leaf surface of Senecio jacobaea. Water extracts of the leaf surfaces of S. jacobaea, S. vulgaris, S. viscosus, and S. sylvaticus contained low concentrations of free amino acids. The proportions of these amino acids were very different from those inside the leaf tissues. In a discriminant analysis, the four species could be completely separated on the basis of the relative proportions of amino acids on the leaf surface.

Susana E. Freire - One of the best experts on this subject based on the ideXlab platform.

  • Synopsis of Senecio series Culcitium (Asteraceae: Senecioneae, Senecioninae) in the Andean region of South America.
    Phytotaxa, 2018
    Co-Authors: Luciana Salomón, Petr Sklenář, Susana E. Freire
    Abstract:

    Based on a detailed study of morphology and a critical analysis of species limits, we present a synopsis of Senecio ser. Culcitium from Andean South America. In this synopsis, Senecio ser. Culcitium is circumscribed including Aetheolaena and Lasiocephalus , two genera which are nested within Senecio . Forty three species are recognized in S. ser. Culcitium that are either rosette or scapiform herbs or subshrubs (sometimes scandent) bearing usually entire leaves, discoid and nodding capitula usually with conspicuous calycular bracts, penicillate style arms with or without a tuft of long hairs, and microechinate pollen. The new combination Senecio hyoseridis is proposed. The following names are proposed as synonyms: Senecio comosus var. debilis and S. comosus var. blancus with S. comosus ; Senecio cuencanus var. tomentella with S. cuencanus ; Senecio decolor , S. iscoensis and S. rosanus with Senecio antisanae , Senecio eliseae with S. rhizomatus ; Senecio hypsobates var. parvulus with S. hypsobates ; Senecio mochensis with S. pindilicensis ; Senecio modestus with S. candollei ; Senecio neeanus and S. haenkeanus with S. nivalis ; Senecio quitensis with S. superandinus ; Senecio santanderensis with S. cocuyanus ; Senecio yacuanquensis with S. otophorus ; Senecio zoellneri with S. keshua . Ten species previously placed in Senecio ser. Culcitium , i.e., S. aspleniifolius , S. candidans , S. comosus , S. diemii, S. gilliesii , S. jarae , S. julianus , S. magellanicus S. martinensis and S. stylotrichus , are excluded. Two of them, Senecio gilliesii and S. candidans are placed within Senecio ser. Hualtatini mainly by their herbaceous habit, stems usually leafy up to the apex, and erect capitula. Senecio jarae and S. aspleniifolius are placed in a new series based on the previously described Senecio sect. Repentes because of their solitary erect capitula and entire or deeply lobed leaves. Lectotypes are designated for 13 names. Additionally, 11 new illustrations, distribution maps, and identification keys are presented.

  • Senecio subser. Polyphylli, a New Name for Senecio subsect. Radiati (Asteraceae, Senecioneae) from Southern South America
    Novon: A Journal for Botanical Nomenclature, 2017
    Co-Authors: Daniel A. Giuliano, Marcelo Paulo Hernández, Susana E. Freire
    Abstract:

    Senecio L. subsect. Radiati Cabrera, an illegitimate name, is replaced with the name Senecio subser. Polyphylli Giuliano, M. P. Hernandez & S. E. Freire, nom. nov.; the epithet of the replacement name refers to the type species of this subsection, S. polyphyllus Kunze ex DC. The epithet Radiati was previously published by Bentham to designate a series of Senecio.

  • MICROMORPHOLOGICAL CHARACTERS SUPPORTING THE REMOVAL OF Senecio SERIES OTOPTERI FROM Senecio (ASTERACEAE, SenecioNEAE)
    2015
    Co-Authors: Adriana Riva, Raúl Pozner, Susana E. Freire
    Abstract:

    Recent molecular studies suggest that Senecio otites belonging to Senecio sect. Senecio ser. Otopteri should be removed from Senecio so that this large and taxonomically complicated genus would be monophyletic. In order to evaluate the taxonomic position of Senecio otites and the placement of series Otopteri, 13 species belonging to Senecio sect. Senecio ser. Otopteri, including S. otites, were examined for micro-morphological characters of the style branches (stigmatic surface, style-arm apices) and anthers (filament collar, anther bases, anther appendages). Three states of these micromorphological characters were present in nearly all species of Senecio sect. Senecio ser. Otopteri: 1) the style-arms are apically convex or subconvex, papillate, and surrounded by a crown of hairs of different lengths; 2) the stigmatic surfaces have a cleft configuration (banded to cleft in S. attenuatus); and 3) the anthers are auriculate. These results provide new morphological support for the placement of Senecio otites in Senecio sect. Senecio ser. Otopteri and the future removal of that series from Senecio proper.

  • New typifications and synonyms in Senecio ser. Culcitium and related taxa (Asteraceae, Senecioneae)
    Phytotaxa, 2014
    Co-Authors: Luciana Salomón, Susana E. Freire
    Abstract:

    Seven lectotypes and three neotypes are designated for ten names applicable to species of Senecio sect. Senecio ser. Culcitium . Our results show that Senecio culcitenellus and S. vaginifolius are conspecific with S. magellanicus , while S. roripifolius is considered a synonym of S. aspleniifolius.

  • Senecio pseudodepressus (Asteraceae, Senecioneae), a New Species from San Juan Province, Argentina
    Systematic Botany, 2013
    Co-Authors: Luciana Salomón, Susana E. Freire
    Abstract:

    Abstract Senecio pseudodepressus, a new species from the Province of San Juan, Argentina, is described and illustrated. Senecio pseudodepressus is morphologically similar to Senecio depressus, but it is distinguished by having mostly 3–8-dentate leaves, pedunculate capitula and pubescent achenes. The new species is assigned to Senecio section Senecio series Chilenses subseries Candidi by its subshrubby habit, tomentose indumentum and solitary discoid capitula. A key to distinguish species of Senecio subser. Candidi with dentate leaves and large involucres is provided. The differences between Senecio pseudodepressus and its related taxa are also discussed.

Jean-pierre Boutin - One of the best experts on this subject based on the ideXlab platform.

  • Species-specific composition of free amino acids on the leaf surface of fourSenecio species
    Journal of Chemical Ecology, 1996
    Co-Authors: Leo L. Soldaat, Jean-pierre Boutin, Sylvie Derridj
    Abstract:

    The specificity of the chemical composition of the leaf surface of four Senecio species was studied in order to understand the host selection of Tyria jacobaeae , a monophagous moth that has Senecio jacobaea as its principal host plant. Pyrrolizidine alkaloids characteristic for Senecio species were not detected in water and sulfuric acid extracts of the leaf surface of Senecio jacobaea . Water extracts of the leaf surfaces of S. jacobaea, S. vulgaris, S. viscosus , and S. sylvaticus contained low concentrations of free amino acids. The proportions of these amino acids were very different from those inside the leaf tissues. In a discriminant analysis, the four species could be completely separated on the basis of the relative proportions of amino acids on the leaf surface.

  • Species-specific composition of free amino acids on the leaf surface of four Senecio species
    Journal of Chemical Ecology, 1996
    Co-Authors: Leo L. Soldaat, Jean-pierre Boutin, Sylvie Derridj
    Abstract:

    The specificity of the chemical composition of the leaf surface of four Senecio species was studied in order to understand the host selection of Tyria jacobaeae, a monophagous moth that has Senecio jacobaea as its principal host plant. Pyrrolizidine alkaloids characteristic for Senecio species were not detected in water and sulfuric acid extracts of the leaf surface of Senecio jacobaea. Water extracts of the leaf surfaces of S. jacobaea, S. vulgaris, S. viscosus, and S. sylvaticus contained low concentrations of free amino acids. The proportions of these amino acids were very different from those inside the leaf tissues. In a discriminant analysis, the four species could be completely separated on the basis of the relative proportions of amino acids on the leaf surface.

Ahmet Aksoy - One of the best experts on this subject based on the ideXlab platform.

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