Abstract:Rumo a uma classificação filogenética de Lychnophorinae (Asteraceae: Vernonieae) Uma hipótese filogenética das Vernonieae Americanas, baseada em uma matriz morfológica e em três regiões moleculares (ITS, ndhF,, revela a existência de quatro linhagens principais neste grupo. Três desses linhagens correspondem, com alguns ajustes, às subtribos Chrestinae, Lychnophorinae e Vernoniinae. A última linhagem é principalmente composta de Lepidaploinae e Elephantopinae. Para uma circunscrição de Lychnophorinae monofilét… Show more
“…After the lignification of the fibre cell walls, there was the further production of vesicles, having an electron-dense amorphous content that was restricted to the periphery of the vesicle, which were secreted primarily at the junction of the fibres with the hypodermis. Another argument against a role for the hypodermis in the secretion of phytomelanin is that the presence of this pigment is not associated with the hypodermis in the roots and rhizomes of some species of the Centaurea tribe (Cardueae; Fritz and Saukel, 2011) and the fruits of Bishopalea, Heterocoma, Sipolisia and Xerxes (Vernonieae; Loeuille, 2011). These observations reinforce the notion that the fibres are responsible for the secretion of phytomelanin in P. diffusa.…”
Section: Is the Hypodermis Responsible For Phytomelanin Secretion In mentioning
confidence: 72%
“…Beyond the PCC, the presence of phytomelanin was confirmed in fruits of subtribe Sipolisiinae (Vernonieae; Loeuille, 2011). It is believed that the adaptive value of phytomelanin is related to the protection of the fruit against predation (Johnson and Beard, 1977).…”
“…After the lignification of the fibre cell walls, there was the further production of vesicles, having an electron-dense amorphous content that was restricted to the periphery of the vesicle, which were secreted primarily at the junction of the fibres with the hypodermis. Another argument against a role for the hypodermis in the secretion of phytomelanin is that the presence of this pigment is not associated with the hypodermis in the roots and rhizomes of some species of the Centaurea tribe (Cardueae; Fritz and Saukel, 2011) and the fruits of Bishopalea, Heterocoma, Sipolisia and Xerxes (Vernonieae; Loeuille, 2011). These observations reinforce the notion that the fibres are responsible for the secretion of phytomelanin in P. diffusa.…”
Section: Is the Hypodermis Responsible For Phytomelanin Secretion In mentioning
confidence: 72%
“…Beyond the PCC, the presence of phytomelanin was confirmed in fruits of subtribe Sipolisiinae (Vernonieae; Loeuille, 2011). It is believed that the adaptive value of phytomelanin is related to the protection of the fruit against predation (Johnson and Beard, 1977).…”
ABSTRACT(Pollen morphology of the genus Eremanthus Less. (Vernonieae, Asteraceae)). In order to evaluate the signifi cance of the pollen morphology for generic and infrageneric taxonomy of the genus Eremanthus (Vernonieae, Asteraceae), and to provide additional data for its phylogenetic reconstruction, the pollen of 20 of the 23 species of the genus was examined using light and scanning electron microscopy. Acetolysed pollen grains were measured, described, and illustrated using light microscopy, while non-acetolysed pollen grains were analyzed using scanning electron microscopy. Pollen grains of these species are isopolar, oblate-spheroidal in most of the species, more rarely prolate spheroidal or suboblate, subtriangular amb, tricolporate and subechinolophate. Th e variation among quantitative characters does not correlate with the macromorphological subdivision of the genus or with the generic or specifi c limits.
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