22 documents found, page 1 of 3
Diversidade da Composição Química dos Óleos Essenciais de Eugenia–Myrtaceae: um...
Silveira, Raisa Maria; Carvalho, Ana Fontenele Urano; Bünger, Mariana de Oliveira; Costa, Itayguara Ribeiro daMyrtaceae is a pantropical family with approximately 132 genera and 5.760 species. In the family, essential oilsare widely produced by their representatives, to the point that the presence of their secretory structures are used in taxonomic identification.This is the case of the species of Eugenia, the largest neotropical genusof Myrtaceae, comprising more than 1000 species.The aim of the present work was to ca...
Effects of topography and climate on Neotropical mountain forests structure in ...
Diogo, Ivan Jeferson Sampaio; Santos, Karin dos; Costa, Itayguara Ribeiro da; Santos, Flavio Antonio Maës dosQuestion: We aimed to analyze how the topography, temperature and rainfall influence the floristic distribution in three different topographic areas and their surrounding vegetation. We addressed three main questions: (i) How is the distribution of species among the topographic areas? (ii) Which abiotic variable is driving this distribution? and (iii) What is the difference among the mountain forests and betwee...
Investigating the floral and reproductive biology of the endangered microendemi...
Teixeira, Valber Dias; Verola, Christiano Franco; Costa, Itayguara Ribeiro da; Zappi, Daniela C.; Costa, Grênivel Mota da; Silva, Suelma RibeiroThe Cactaceae are known to be amongst the most endangered plant families of the world due to reduction of their habitats and activities of collectors. As the species of the family are dependent on animals to perform cross pollination, and hence seed production, their population performance may be further negatively affected by interrupted biotic interactions. For efficient conservation of rare species, knowledg...
Clade-specific responses regulate phenological patterns in Neotropical Myrtaceae
Staggemeier, Vanessa G.; Diniz-Filho, José Alexandre F.; Zipparro, Valesca B.; Gressler, Eliana; Castro, Everaldo Rodrigo de; Mazine, FiorellaUnderstanding plant reproduction from an eco-phylogenetic perspective is essential because it allows us to predict how phenology could change in response to climatic changes. Unfortunately, reproductive patterns have been poorly explored in contemporary phylogenetic context until now. Closely related species are expected to reproduce in a similar ecological niche if phylogeny constrains the time of flowering an...
Caracterização agronômica de Ocimum gratissimum L (alfavaca-cravo) e Ocimum sp ...
Guerra, Maria Elane de Carvalho; Medeiros Filho, Sebastião; Costa, Itayguara Ribeiro da; Freitas, João Batista Santiago; Oliveira, Alexandre Bosco dePlant growth can be monitored over time, through the determination of variables such as dry matter and leaf area, as it is related to the increase in dry matter from the conversion of simple inorganic substances into organic substances, through the process of photosynthesis . From the evaluation of the growth data, techniques for managing the species can be developed, or the causes of variation between plants t...
DNA methylation patterns and karyotype analysis of off-type and normal phenotyp...
Cristofolini, Caroline; Vieira, Leila do Nascimento; Fraga, Hugo Pacheco de Freitas; Costa, Itayguara Ribeiro da; Guerra, Miguel Pedro; Pescador, RoseteAcca sellowiana is a native species to the southern region of Brazil, with secondary dispersion in Uruguay northeast. The potentially economic interest of this species motivated many fundamental and applied researches, such as micropropagation protocols development, including somatic embryogenesis (SE). Previous studies have reported the high frequency of off-type somatic embryos in A. sellowiana SE and low con...
Polyploidy and polyembryony in Anemopaegma (Bignonieae, Bignoniaceae)
Firetti-Leggieri, Fabiana; Lohmann, Lúcia G.; Alcantara, Suzana; Costa, Itayguara Ribeiro da; Semir, JoãoPolyploidy is a key process in plant evolution, with the asexual formation of embryos representing a way through which polyploids can escape sterility. The association between polyploidy and polyembryony is known to occur in Bignoniaceae. In this study, we investigate polyembryony in four polyploid species of Anemopaegma: A. acutifolium, A. arvense, A. glaucum and A. scabriusculum as well as in one diploid spec...
Evolution of exceptional species richness among lineages of fleshy-fruited Myrt...
Biffin, Ed; Lucas, Eve J.; Craven, Lyn A.; Costa, Itayguara Ribeiro da; Harrington, Mark G.; Crisp, Michael D.Background and Aims The angiosperm family Myrtaceae comprises 17 tribes with more than half of the estimated 5500 species being referred to the fleshy-fruited and predominantly rainforest associated Syzygieae and Myrteae. Previous studies suggest that fleshy fruits have evolved separately in these lineages, whereas generally shifts in fruit morphology have been variously implicated in diversification rate shift...
Nuclear genome size variation in fleshy-fruited Neotropical Myrtaceae
Costa, Itayguara Ribeiro da; Dornelas, Marcelo Carnier; Forni-Martins, Eliana ReginaIn Myrtaceae, reports regarding the nuclear DNA content are scarce. The aim of this study is to present genome size data for fleshy-fruited Myrteae, and to test their relation with chromosome number and ploidy, the available data for cytoevolutionary studies in Myrtaceae. Thirty species out of ten genera were investigated for chromosome number and genome size using flow cytometry. Twenty-eight species were dipl...
Karyotype analysis in South American species of Myrtaceae
Costa, Itayguara Ribeiro da; Forni-Martins, Eliana R.In Myrtaceae (Myrteae), the diploid chromosome number 2n = 2x = 22 is the most common, although variations of ploidy level occur, with some triploid (2n = 3x = 33) and tetraploid (2n = 4x = 44) records. Karyotype details in this group are scarce because the chromosomes are small (< 2 mm). In this work, we carried out a karyotypic analysis of 15 species of Myrtaceae grouped in different subtribes and genera. Mea...