Evolução de Cereus hildmannianus (Cactaceae) no Sul do Brasil.

Silva, Gislaine Angélica Rodrigues

doi:10.11606/t.17.2013.tde-12062013-155615

Cited by 3 publications

(3 citation statements)

References 50 publications

(78 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There seems to be a uniform anatomical pattern in the organization of the vascular system in the androecial structures of the Cactaceae. Similar anatomical features as those described in this study, i.e., tepals with several small collateral bundles and stamens with more amount of vascular tissue made of xylem as phloem, have also been observed in terrestrial and epiphytic lineages, of the Cactaceae, specifically in species of Cereus (Silva 2020), Opuntia (Fuentes-Peres et al 2009), Epiphyllum phyllanthus (Almeida et al 2010), Hatiora, and Rhipsalis (Almeida et al unpub.). Likewise, the tepals in Opuntia display several vascular bundles derived from a central group that differs in size from the remaining bundles (Rosas-Reinhold et al 2021); thereby, the central bundle is larger than the others and comparable to vascular bundles in leaves.…”

Section: Vasculature In Stamens and Tepaloid Staminodesupporting

confidence: 85%

Synchrotron micro-computed tomography unveils the three-dimensional structure and origin of staminodes in the Plains Prickly Pear Cactus Opuntia polyacantha Haw. (Cactaceae)

et al. 2023

View full text Add to dashboard Cite

Floral appendages display an array of shapes and sizes. Among these organs, staminodes are morphologically diverse structures that have lost the ability to produce pollen, but in some instances, they produce fertile pollen grains. In the family Cactaceae staminodes are uncommon and range from simple linear to flat to spatulate structures, but studies describing their structural attributes are scanty. This study highlights the advantages of synchrotron radiation for sample preparation and as a research tool for plant biology. It describes the internal morphology of floral parts, particularly stamen, tepal, and staminode in the Plains Prickly Pear Cactus, Opuntia polyacantha, using synchrotron radiation micro-computed tomography (SR-μCT). It also shows the different anatomical features in reconstructed three-dimensional imaging of reproductive parts and discuss the advantages of the segmentation method to detect and characterize the configuration and intricate patterns of vascular networks and associated structures of tepal and androecial parts applying SR-μCT. This powerful technology led to substantial improvements in terms of resolution allowing a more comprehensive understanding of the anatomical organization underlying the vasculature of floral parts and inception of staminodes in O. polyacantha. Tepal and androecial parts have uniseriate epidermis enclosing loose mesophyll with mucilage secretory ducts, lumen, and scattered vascular bundles. Cryptic underlying structural attributes provide evidence of a vascularized pseudo-anther conjoint with tepals. The undefined contours of staminodial appendages (pseudo-anther) amalgamated to the tepals' blurred boundaries suggest that staminodes originate from tepals, a developmental pattern supporting the fading border model of floral organ identity for angiosperms.

show abstract

Section: Vasculature In Stamens and Tepaloid Staminodesupporting

confidence: 85%

Synchrotron micro-computed tomography unveils the three-dimensional structure and origin of staminodes in the Plains Prickly Pear Cactus Opuntia polyacantha Haw. (Cactaceae)

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Tomando-se ambas as análises realizadas com o gene COI, poder-se-ia supor que o centro de dispersão e o extensivo fluxo gênico sugerido por outros autores Mateus & Sene 2007;Mateus et al, 2013) entre as populações de D. antonietae se dê pela região oeste da sua distribuição. As modelagens ecológicas do período LGM da distribuição de D. antoneitae e de C. hildmaniannus (Silva, 2013) contribuem para esta hipótese. Modelagens ecológicas de 20 e 6 mil anos antes do presente indicam que as florestas secas estavam deslocadas para o brasileiro e pelos países vizinhos (Werneck, 2011;Prado & Gribbs, 1993).…”

Section: Discussionunclassified

Estrutura populacional e filogeografia de <i>Drosophila antonietae</i> Tidon & Sene

Koser¹

View full text Add to dashboard Cite

Drosophila antoneitae is a cactophilic species, ovipositing primarily in the host cacti Cereus hildmaniannus. Both species are found in drained soils or rocky outcrops in the Missiones region-one of the Seasonally Dry Tropical Forest (SDTF) nucleis, and in south Brazilian coast. The Missiones nuclei comprises the basin of the Paraná-Paraguai Rivers and it is a possible area of climatic stability during the Quaternary oscillations. To evaluate the current distribution of the genetic diversity of D. antoneitae and its association with landscape modifications, the following analyses were performed: populational structure, establishment of phylogeographic hypotheses and demographic events, neutrality tests and paleoecological niche modeling. The mitochondrial gene COI and the nuclear gene period were analyzed. The gene period had low genetic diversity and an homogeneity on the distribution of genetic variability. For gene COI analysis we found a high polymorphism and genetic structure among populations, forming three groups: one in Santa Catarina and Rio Grande do Sul, another in Paraná and São Paulo and the third in the midwestern Brazil. The midwestern population is probably the oldest one, coinciding with the most climatically stable area of this study. This group forms a network of separate haplotypes, due to a high structuring and isolation, probably with Paraná River acting as major barrier for gene flow. We suggest that the possible center of dispersion of the remaining populations of D. antonietae is located in southeastern Brazil, and there were several migration events to other regions of its distribution. There is evidence of shared polymorphism due to recent diversification of populations. Both gene clusters exhibit signs of population expansion, especially in border areas at the Missiones nuclei, where the climate seems less stable. The demographic expansion period is recent and coincides with the major expansion of dry vegetation, which can also play a critical role in structuring populations.

show abstract

“…Do ponto de vista ecológico-adaptativo, a diferenciação populacional pode ser influenciada pela composição química dos cactos utilizados e pela expressão gênica de genes relacionados aos processos de desintoxicação de compostos secundários MATZKIN, 2008MATZKIN, , 2012. Em termos históricos, é possível que eventos subsequentes e recorrentes, porém não sincrônicos, de expansão e retração das formações vegetais abertas (árido/semi-árido), durante paleoeventos climáticos alteraram a distribuição de populações de cactos (BONATELLI et al, 2014;TAYLOR;ZAPPI, 2004) e, consequentemente, influenciando as populações de Drosophila (FRANCO;MANFRIN, 2013;MORALES, 2005;MORAES et al, 2009;SANTOS, 2011 O "cluster" Drosophila buzzatii é considerado um grupo monofilético, sugerido pela análise de marcadores cromossômicos (RUIZ; WASSERMAN, 1993), genes nucleares (FRANCO et al, 2010;SANTOS et al, 2009) FRANCO et al, 2008;SILVA;SENE, 1991…”

Section: -Espécies Cactófilas De Drosophilaunclassified

História evolutiva de Drosophila serido ("cluster" Drosophila buzzatii)

Lavagnini-Pizzo¹

View full text Add to dashboard Cite

Dedico esta Tese a pessoas muito especiais, cujo apoio e incentivo foram fundamentais nesta jornada: Meus amados pais, Marli Carmona Lavagnini e Antonio Carlos Lavagnini, que SEMPRE acreditaram nos meus sonhos, Ao meu companheiro, José Henrique Pizzo, por todo apoio e compreensão, À minha orientadora Profa. Dra. Maura Helena Manfrin, por ter me proporcionado tanto aprendizado junto ao Laboratório de Genética Evolutiva. 6 AGRADECIMENTOS À Profa. Dra. Maura Helena Manfrin por toda dedicação e apoio direcionados à minha formação como bióloga e pesquisadora. É incomensurável o quanto aprendi durante estes quatros anos de convivência e trabalho. Ao Prof. Dr. Fábio de Melo Sene por ter compartilhado seus conhecimentos e experiências com relação às moscas, os cactos e o trabalho de campo.

show abstract

Evolução de Cereus hildmannianus (Cactaceae) no Sul do Brasil.

Cited by 3 publications

References 50 publications

Synchrotron micro-computed tomography unveils the three-dimensional structure and origin of staminodes in the Plains Prickly Pear Cactus Opuntia polyacantha Haw. (Cactaceae)

Synchrotron micro-computed tomography unveils the three-dimensional structure and origin of staminodes in the Plains Prickly Pear Cactus Opuntia polyacantha Haw. (Cactaceae)

Estrutura populacional e filogeografia de <i>Drosophila antonietae</i> Tidon & Sene

História evolutiva de Drosophila serido ("cluster" Drosophila buzzatii)

Contact Info

Product

Resources

About