301 |
Phylogenetic relationships between morphologically similar barbus species, with reference to their taxonomy, distribution and conservationEngelbrecht, Johannes Schalk 07 September 2012 (has links)
Ph.D. / A genetic study of seven fish species within the chubby and goldie barb groups of minnows was done by means of starch-gel electrophoresis. These two groups of minnows are widely distributed within the temperate rivers of southern Africa. Because of little morphological differentiation between the species within these two groups of barbs, their taxonomy has not yet been settled. Subsequently, species within these two groups of minnows could not always be identified with certainty and caused some problems for conservation bodies concerning the distribution and status of the different species. To make a contribution towards the taxonomy and conservation of these fish species, 330 specimens of goldie and chubbyhead barbs were analysed to determine the genetic variation within and between 17 populations comprising seven species. The heterozygosity values obtained in the present study within populations is similar to the values obtained for fish in other studies (Nevo et al., 1984; Alves and Coelho, 1994). The highest heterozygosity values were observed in fish populations collected from the eastern Cape, which could possibly be an indication of a relationship between this specific habitat and genetic diversity. In contrast, relatively low heterozygosity values were observed in some populations, for example Barbus brevipinnis (Marite River) and B. gurney! (Mgeni River), which could possibly be attributed to a degraded habitat. This assumption is supported by the fact that these populations were infested with parasites, which is often an indication of stress.
|
302 |
A phylogenetic study of the family Combretaceae with emphasis on the genus Combretum in AfricaMaurin, Olivier 16 May 2011 (has links)
Ph.D. / The complexity of Combretaceae and lack of information on phylogenetic relationships within the family led me to explore relationships between and within genera of Combretaceae by means of combined analyses of plastid (rbcL, psaA-ycf3 spacer, and psbA-trnH spacer) and nuclear ribosomal ITS sequences for all but three of the 17 genera in Combretaceae. The current classification of the family into two subfamilies, Strephonematoideae and Combretoideae, is corroborated. Within Combretoideae, division into two tribes, Laguncularieae and Combreteae, is strongly supported. Within Combreteae subtribe Terminaliinae relationships between genera are largely unresolved. Terminalia is not supported as monophyletic, and two groups were identified, one containing mainly African species and another of mostly Asian species. Pteleopsis, Buchenavia and Anogeissus are embedded within Terminalia, and I suggest that all genera of Terminialiinae with the exception of Conocarpus should be included into an expanded Terminalia. Within subtribe Combretinae, a clade formed by the two monotypic genera Guiera and Calycopteris is sister to the rest of the subtribe. Within Combretinae, groupings are consistent with recent results based on morphological data. Combretum is currently divided into three subgenera: Apethalanthum, Cacoucia and Combretum. The two last were included in this study and supported as monophyletic. Meiostemon is sister to subgenus Combretum, and Quisqualis is embedded within subgenus Cacoucia. I recommend that subgenus Combretum should be expanded to include Meiostemon and subgenus Cacoucia to include Quisqualis. The sectional classification within Combretum proposed in earlier morphological studies is confirmed except for the exclusion of Combretum imberbe from section Hypocrateropsis into a separate and monotypic section and the inclusion of Combretum zeyheri (section Spathulipetala) within section Macrostigmatea. In order to accommodate Combretum imberbe a new section is suggested which is formally described in Maurin et al. (2010). The reinstatement of previously recognised sections Grandiflora and Trichopetala, both of which had been sunk into subgenus Cacoucia section Poivrea, is also suggested. In this study two new species from South Africa are presented: Combretum nwambiyana O.Maurin, M.Jordaan & A.E.van Wyk and Combretum stylesii Maurin, Jordaan & A.E.van Wyk. The formal description of these two new species will be done in regular journals. Divergence time estimates using a Bayesian MCMC approach implemented in BEAST suggested a crown date for Combretaceae around 82.6 mya with the two subtribes Combretinae and Terminaliinae splitting at the end of the Late Cretaceous during a period marked by a number of mass extinctions both in plants and animals. The Miocene and Pliocene are characterised by constant speciation with many clades within Combretaceae succesfully adapting to savanna vegetation and diversifying within it.
|
303 |
Diagnostic and phylogenetic character variation in the genus Canthon Hoffmannsegg and related genera (Coleoptera: Scarabaeidae: Scarabaeinae)Medina Uribe, C.A. (Claudia Alejandra) 29 March 2006 (has links)
Morphological variation was examined in 58 species of Canthon and 18 species of other genera of the subtribe Canthonina (Anisocanthon, Canthonella, Cryptocanthon, Deltochilum, Hansreia, Holocanthon, Malagoniella, Melam canthon, Scybalocanthon, and Sylvicanthon). A total of 667 specimens was used for examination of morphological characters. Variation in head structures such as clypeus, eyes, labium, gula, and epipharynx is described. Thoracic structures examined include the pronotum, prosternum, and posterior and medial tibiae. Other structures examined were the elytra, pygidium, and male genitalia, including the sclerites and bushes of the internal sac of the aedeagus. Secondary sexual features (shape of anterior tibial spur and shape of last abdominal segment) were also examined. The characteristics examined include diagnostic characters for the genus Canthon. This analysis revealed that Canthon is a very heterogeneous and artificial group, the limits of which are based on a combination of characters that is not exclusive to genus. Many characters that have been used in the diagnosis of Canthon are general characters that show wide variation within Canthon as well as in other genera of Canthonina. Only a few derived characters were exclusively shared by species of Canthon. However, several genera of Canthonina shared with Canthon some characters, mainly in structures such as the epipharynx and the internal sac of the aedeagus, (epipharynx with two well-defined lateral combs, internal sac with a complete ring-shaped sclerite, reduction in the postero-dorsal aperture of the eye, and reduction in the setae of the anterior margin of the mentum). Due to the fact that the external morphology shows great variation, it is important to consider the study of the other possible sources of characters to resolve the phylogenetic relationships among groups. / Dissertation (MSc (Entomology))--University of Pretoria, 2007. / Zoology and Entomology / unrestricted
|
304 |
The taxonomy, phylogeny and ecology of Botryosphaeriacceous fungi occurring on various woody hostsSlippers, Bernard 13 August 2008 (has links)
Please read the abstract in the section front of this document. / Thesis (PhD)--University of Pretoria, 2008. / Microbiology and Plant Pathology / Unrestricted
|
305 |
Phylogenetic reconstruction based on internal and external morphology of the genus Thoropa Cope, 1865 (Anura, Cycloramphidae) = Reconstrução filogenética com base em morfologia interna e externa do gênero Thoropa Cope, 1865 (Anura, Cycloramphidae) / Reconstrução filogenética com base em morfologia interna e externa do gênero Thoropa Cope, 1865 (Anura, Cycloramphidae)Nunes-de-Almeida, Carlos Henrique Luz, 1967- 04 October 2015 (has links)
Orientadores: Luis Felipe de Toledo Ramos Pereira, Renato Neves Feio / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-08-27T16:33:55Z (GMT). No. of bitstreams: 1
Nunes-de-Almeida_CarlosHenriqueLuz_M.pdf: 2724728 bytes, checksum: 32daa352df879ffab82840075e1dc3f6 (MD5)
Previous issue date: 2015 / Resumo: Os anfíbios da família Cycloramphidae são endêmicos da porção oriental do Brasil e alguns estão ameaçados ou em perigo de extinção. Apesar de ser uma família com poucos grupos taxonômicos, apenas três gêneros (Cycloramphus, Thoropa e Zachaenus), até o momento não há uma proposta filogenética para o gênero Thoropa que abranja todas as espécies. Então, propomos a reconstrução filogenética de Thoropa usando como grupo esterno, uma espécie do gênero Hylodes (Hylodidae), duas do gênero Cycloramphus e uma espécie do gênero Zachaenus. Definimos 86 caracteres baseados em osteologia, ecologia e morfologia externa de adultos e larvas. Neste contexto realizamos a descrição da forma larval de Cycloramphus rhyakonastes, a qual foi utilizada como grupo esterno. A filogenia proposta é baseada em critérios de máxima parcimônia. Como duas das árvores resultantes indicam parafilia, propomos aqui um novo gênero para as espécies de menor porte, separando-as das espécies maiores / Abstract: The phylogenetic resolution of Neotropical amphibians increased considerably in recent decades, providing great understanding of the relationships of higher taxa, such as the relationships between families and genera. After such improvement, amphibian systemticians are now focusing their efforts on lower taxa, such as the relationships within congeneric species. Under such context we did a phylogenetic reconstruction of the genus Thoropa, for which no comprehensive phylogeny is available. We examined all species of the genus including two species with extinct populations and possible new species. We adopted the criteria of maximum parsimony to analyze 86 characters based on osteology, external morphology, behavior, bioacoustics, and tadpole external morphology of at least one specimen per species. As the resulting topology of Thoropa tree indicates a possible case of paraphyly, we propose a new genus, assuring the monophyly of Thoropa in all possible scenarios / Mestrado / Biodiversidade Animal / Mestre em Biologia Animal
|
306 |
Relações filogenéticas no gênero Acestrorhynchus (Teleostei, Characiformes), com base na análise de genes nucleares e mitocondriais / Phylogenetic relationships among Acestrorhynchus (Teleostei, Characiformes) inferred from analysis of nuclear and mitochondrial sequence dataVania Quibao Pretti 20 February 2008 (has links)
O gênero Acestrorhynchus encontra-se amplamente distribuído na América do Sul, estando presente nas bacias do Paraná-Paraguai, Uruguai, no rio São Francisco, nos rios costeiros das Guianas, e nas bacias dos rios Amazonas e Orinoco, sendo as duas últimas, o local onde se encontra a maior diversidade desses peixes. Na ausência de estudos mais detalhados sobre as relações filogenéticas entre as espécies de Acestrorhynchus, as 14 espécies reconhecidas têm sido agrupadas com base no seu padrão de coloração. O primeiro trabalho focalizando as relações filogenéticas das espécies de Acestrorhynchus, foi desenvolvido recentemente e estabelece as relações de parentesco de 13 espécies do gênero com base na análise de 104 características osteológicas e de morfologia externa. No presente estudo, 2139 pares da região 16S e da ATPase, ambos do genoma mitocondrial, juntamente o primeiro íntron da proteína ribossomal S7 do genoma nuclear, foram analisados para as espécies A. microlepis, A. falcatus, A. heterolepis, A pantaneiro, A. falcirostris, A. altus, A. minimus, A. grandoculis, A. britskii, A. lacustris e A. nasutus. Os gêneros Roeboides, Rhaphiodon e Gephyrocharax foram utilizados como grupo externo. A análise de máxima parcimônia, com busca heurística e adição aleatória de seqüências com o algoritmo TBR resultou na obtenção de uma árvore mais parcimoniosa com 2.551 passos. Os índices de consistência e retenção foram, respectivamente, 0,633 e 0,533. Os resultados obtidos através da análise dos dados moleculares corroboram, assim como os resultados morfológicos, o monofiletismo dos agrupamentos propostos com base nos padrões de coloração. / Fishes of the Neotropical characiform genus Acestrorhynchus Eigenmann, comprise freshwater species widely distributed throughout South American rivers, being found in the Paraná, Paraguai, Uruguai, São Francisco and of Guyana rivers. However it is in the Amazonas and Orinoco river basins where the highest diversity of this group of fishes is present. In the absence of more detailed phylogenetic studies the 14 recognized species are grouped on the basis of their color patterns. The first specific study about the phylogenetic relationships of Acestrorhynchus species, was recently developed and it established the relationships of 13 species of the genus, based in the analysis of 104 osteological and external morphological characters. In the present study, simultaneous analysis of 2139 aligned base pairs from the mitochondrial 16S and ATPase and the nuclear first intron of the S7 ribosomal protein were analyzed for the species A. microlepis, A. falcatus, A. heterolepis, A pantaneiro, A. falcirostris, A. altus, A. minimus, A. grandoculis, A. britskii, A. lacustris e A. nasutus. The genera Roeboides, Rhaphiodon and Gephyrocharax were included in the analysis as outgroups. Maximum parsimony analysis, and heuristic searches with random taxon addition replicates and TBR branch swapping were performed resulting in one most parsimonious tree with 2,551 steps in length. The consistence index and retention index were 0,633 and 0,533, respectively. The results revealed with molecular data as well as the ones obtained with morphological characters corroborate, the monophyly of the genus and the grouping proposed based in the color pattern.
|
307 |
Sistemática molecular de Oxypetalum R.Br. (Apocynaceae, Asclepiadoideae) / Molecular Systematics of Oxypetalum (Apocynaceae, Asclepiadoideae)Maria Ana Farinaccio 12 March 2008 (has links)
A subfamíla Asclepiadoideae,uma das maiores de Apocynaceae, é principalmente tropical e subtropical, com centro de diversidade na América do Sul. Oxypetalum é o maior género neotropical da subfamília e engloba ca. de 120 espécies, a maioria encontrada no Brasil. O gênero é reconhecido pela combinação de caracteres que incluem ginostégio rostrado e polinários com caudículos horizontais, providos de uma membrana reticulada com dentes laterais. Oxypetalum é incluído na subtribo Oxypetalinae, uma das melhor definidas em Asclepiadoideae. Poucos estudos filogenéticos incluíram o gênero e os resultados desses trabalhos foram pouco conclusivos, pois os Oxypetalum emergiram em politomia e a delimitação e monofiletismo do gênero não foram estabelecidos. Neste estudo, 86 táxons foram analisados, com o objetivo principal de averiguar o monofiletismo de Oxypetalum e estabelecer relações de parentesco entre as espécies. As análises filogenéticas foram conduzidas com os espaçadores intergênicos ITS (nrDNA), trnH-psbA, trnC-ycf6 e trnD-trnT (cpDNA), combinados com uma matriz morfológica. Os resultados demonstraram que Oxypetalum não é um grupo monofilético uma vez que Schistogyne emerge entre as espécies de Oxypetalum. O clado que inclui os dois gêneros tem bom suporte estatístico (84% de bootstrap) e é sustentado pelas sinapomorfias lacínias lanceoladas, retináculo bem desenvolvido, aproximadamente do tamanho dos polínios ou maiores, e presença de dentes nos caudículos, embora nem todas as espécies compartilhem de todas elas. A sinonimização de Schistogyne em Oxypetalum torna este último monofilético. O monofiletismo e o posicionamento de Oxypetalum entre as Oxypetalinae foram estabelecidos, assim como a presença de seis clados com alto suporte estatístico. No entanto as relações entre estes clados não estão determinadas. Diante desse panorama, quatro propostas de agrupamentos sistemáticos informais em Oxypetalum são apresentadas. / The subfamily Asclepiadoideae, one of the largest in the Apocynaceae, is mainly tropical and subtropical, with a diversity center in South America. Oxypetalum is the largest Neotropical genus of the subfamily and comprises ca. 120 species, most of which can be found in Brazil. The genus is recognized by a combination of characters, including a rostrate gynostegium and pollinaria with horizontal caudicles containing a reticulate membrane with lateral teeth. Oxypetalum is included in the subtribe Oxypetalinae, one of the best-defined in Asclepiadoideae. Few phylogenetic studies have included this genus, and the results of those studies were little conclusive, since Oxypetalum representatives emerged in polytomy and the delimitation and monophyletic character of the genus have not been established. In this study, 86 taxa were analyzed, with the main objective of investigating the monophyletic nature of Oxypetalum and establishing phylogenetic relationships between the species. The phylogenetic analyses were conducted with intergenic spacers ITS (nrDNA), trnH-psbA, trnC-ycf6, and trnD-trnT (cpDNA), in combination with a morphological matrix. The results demonstrated that Oxypetalum is not a monophyletic group, since Schistogyne emerges among the Oxypetalum species. The clade that includes both genera has good statistical support (84% bootstrap), based on synapomorphies such as lanceolate laciniae, well-developed corpusculum, approximately the size of the pollinia or larger, and the presence of teeth on the caudicles, although not all species share all these. The synonymization of Schistogyne into Oxypetalum makes the latter a monophyletic genus. The subfamily Asclepiadoideae is one of the largest in Apocynaceae. It is mainly tropical and subtropical, with a diversity center in South America. A recent study has demonstrated that Oxypetalum, the largest Neotropical genus in the subfamily, is not a monophyletic group, since Schistogyne emerges among Oxypetalum species. Thus, the synonymization of Schistogyne into Oxypetalum makes the latter group monophyletic. The traditional classifications of Oxypetalum are artificial, and the taxa are not clearly delimited. These classifications are not corroborated by recent phylogenies. In these phylogenies, the monophyletic nature and position of Oxypetalum among the Oxypetalinae were established, as well as the presence of six clades with strong statistical support. Nevertheless, the relations between these clades have not been determined. Because of this scenario, four proposals of informal systematic groups are presented for Oxypetalum.
|
308 |
Towards a phylogenetic classification of Lychnophorinae (Asteraceae: Vernonieae) / Rumo a uma classificação filogenética de Lychnophorinae (Asteraceae: Vernonieae)Benoit Francis Patrice Loeuille 11 July 2011 (has links)
A phylogenetic hypotesis of American Vernonieae based on three molecular regions (ITS, ndhF, rpl32-trnL) and on a morphological dataset reveals the existence of four main lineages in the group. Three of these lineages correspond, with a few adjustments, to subtribes Chrestinae, Lychnophorinae and Vernoniiae. The last lineage is mainly composed of Lepidaploinae and Elephantopinae. In order to keep the Lychnophorinae monophyletic, two small subtribes (Centratherinae, Sipolisiinae) and three monotypic genera (Albertinia, Blanchetia and Gorceixia) must be to transferred to Lychnophorinae, which has the presence of heliangolide in aerial parts as a synapomorphy. Our results show that syncephaly probably appeared independently three of four times in the course of evolution of American Vernonieae. Special features of these aggregation of heads in each lineage suggest that the formation of syncephalia is related to different biological functions: attractive in Chrestinae, disseminative in Rolandrinae or protective in Lychnophorinae. A phylogenetic analysis of Lychnophorinae was further performed based on a morphological dataset and on four molecular regions (ETS, ITS, ndhF, rpl32-trnL), in order to delimit monophyletic genera in Lychnophorinae, and to achieve a better understanding fo the relationships between the genera of the subtribe. The richest genus of the subtribe, Lychnophora, with 32 describe species, emerged as polyphyletic, involving three main lineages not closely related. Most clades obtained are associated with some existing generic concept and can be defined by a simple combination of morphological characters. Albertinia, Blanchetia and Gorceixia are the most basal lineages, whereas Eremanthus and Lychnophora stricto sensu emerged as the most derived clade, which contains half of the species of the subtribe. However, relationships between the remaining clades persist partially unresolved. Aiming to compare the influence of a hierarchical representation of homology hypotheses on phylogenetic inference, two morphological datasets of American Vernonieae and Lychnophorinae (Asteraceae) have been analyzed using parsimony and three-item analysis. The results widely diverged not only in terms of topology but also in the number of homologies recovered. The three-item analysis appears to retrieve a higher information content fron the original datasets. The already acknowledged high level of homoplasy in Vernonieae morphological data is here confirmed and most of the clades are not supported by synapomorphies. Based on the results of the phylogenetic analyses performed, a new classification of the subtribe Lychnophorinae is here proposed. The subtribes Centratherinae and Sipolisiinae are reduced to synonymy of Lychnophorinae and three genera (Albertinia, Blanchetia, Gorceixia) are transferred to the subtribe. As now circumscribed, Lychnophorinae comprises 18 genera and 104 species distributed mostly in the cerrado, domain of the Brazilian Central Plateau, Oiospermum is synonymized under Centratherum, and Irwinia under Blanchetia. Because Lychnophora as currently circumscribed was shown to be polyphyletic, it is here dismantled into three monophyletic genera: Lychnophora s.s., Lychnocephalus and a new genus described herein, Lychnophorella. 17 new combinations are proposed as well as 10 new synonymies. The descriptions of eight new species of Lychnophorinae are presented: Eremanthus brevifolius, Heterocoma gracilis, H. Robinsoniana, Minasia ramose, Paralychnophora glaziouana, Piptolepis campestris, P. monticola and P. schultziana. The synopsis provides the taxonomic status, data on nomenclatural types, geographical distribution, and taxonomic notes for each species. / Uma hipótese filogenética das Vernonieae Americanas, baseada em uma matriz morfológica e em três regiões moleculares (ITS, ndhF, rpl32-trnL), revela a existência de quatro linhagens principais neste grupo. Três dessas 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 monofilética, devem ser aqui incluídos duas pequenas subtribos (Centratherinae, Sipolisiinae) e três gêneros monotípicos (Albertinia, Blanchetia e Gorceixia), tendo como sinapomorfia a presença de heliangolidos nas partes aéreas. Nossos resultados mostram que a sincefalia provavelmente surgiu três ou quatro vezes ao longo da evolução das Vernonieae Americanas. As características especiais dessas agregações de capítulos em cada linhagem sugerem que a formação da sincefalia deve estar relacionada a diferente funções biológicas: atração nas Chrestinae, dispersão nas Rolandrinae ou proteção nas Lychnophorinae. A análise filogenética das Lychnophorinae foi realizada baseada numa matriz morfológica e quatro regiões moleculares (ETS, ITS, ndhF, rpl32-trnL), a fim de delimitar gêneros monofiléticos na subtribo, e alcançar uma melhor compreensão das relações entre seus gêneros. O gênero mais rico da subtribo, Lychnophora, com 32 espécies descritas, emergiu como polifilético, envolvendo três principais linhagens não estreitamente relacionadas. A maioria dos clados obtidos estão associados a conceitos de gêneros já existentes e podem ser definidos por uma combinação simples de caracteres morfológicos. Albertinia, Blanchetia e Gorceixia são as linhagens mais basais, enquanto Eremanthus e Lychnophora stricto sensu emergiram como o clado mais derivado, que contém metade das espécies da subtribo. Porém, as relações entre os demais clados persistem apenas parcialmente resolvidas. Com o objetivo de comparar a influência de uma representação hierárquica de hipóteses de homologia em inferência filogenética, uma matriz morfológica das Vernonieae Americanas e uma das Lychnophorinae (Asteraceae) foram ambas analisadas usando a parcimônia e análise de três itens. Os resultados divergiram muito não só em termos de topologia, mas também no número de homologias recuperadas. A análise de três itens parece recuperar um maior conteúdo de informação das matrizes originais. O nível elevado de homoplasia já reconhecido em dados morfológicos de Vernonieae foi aqui confirmado e a maioria dos clados não são sustentados por sinapomorfias. Baseada nos resultados das análises filogenéticas realizadas, propõe-se aqui uma nova classificação da subtribo Lychnophorinae, e uma sinopse é apresentada. As subtribos Centratherinae e Sipolisiinae são reduzidas a sinonímia de Lychnophorinae e três gêneros (Albertinia, Blanchetia, Gorceixia) são transferidos para a subtribo. Como agora circunscrita, Lychnophorinae compreende 18 gêneros e 104 espécies distribuídas principalmente no domínio do cerrado do Planalto Central Brasileiro. Propõe-se a sinonimização de Oiospermum sob Centratherum, e de Irwinia sob Blanchetia. Devido ao fato de Lychnophora, como atualmente circunscrito ter-se mostrado polifilético, suas espécies tiveram que ser rearranjadas em três gêneros monofiléticos: Lychnophora s.s., Lychnocephalus e um novo gênero agora descrito, Lychnophorella. 17 novas combinações são propostas bem como 10 novas sinonímias. As descrições de oito novas espécies de Lychnophorinae são apresentadas: Eremanthus brevifolius, Heterocoma gracilis, H. robinsoniana, Minasia ramosa, Paralychnophora glaziouana, Piptolepis campestris, P. monticola e P. schultziana. A sinopse inclui os dados fundamentais de todas as espécies de Lychnophorinae: status taxonômico, dados sobre os tipos nomeclaturais, distribuição geográfica e habitat, além de notas taxonômicas.
|
309 |
Sporobolomyces koalae como um novo agente de controle biológico /Estevam, Deborah Maria de Paula. January 2019 (has links)
Orientador: Katia Cristina Kupper / Coorientador: Maurício Ventura Mazzi / Fernando Russo Costa do Bomfim / Rita de Cássia Panizzi / Resumo: Dentre as doenças de pós-colheita que ocorrem em citros, encontra-se a podridão azeda, causada por Geotrichum citri-aurantii, que afeta frutos de todas as espécies e cultivares em países produtores da cultura. Para as condições de Brasil, não existem fungicidas registrados para o controle desse patógeno. Na busca de uma alternativa de manejo, esse trabalho visa dar continuidade aos estudos da levedura Sporobolomyces koalae, que em pesquisas anteriores mostrou potencial para o controle da doença, tendo como objetivos específicos: (i) a análise filogenética para confirmação da espécie do isolado ACBL-42 (Sporobolomyces koalae); (ii) verificar o efeito de diferentes meios de cultivo na produção de células da levedura; (iii) determinar a curva de crescimento de S. koalae; (iv) verificar o efeito de fontes nutricionais no cultivo da levedura para a atividade antagônica; (v) verificar mecanismos de ação da levedura que possam estar envolvidos no controle de G. citri-aurantii, e, finalmente, (vi) dar início a estudos de biossegurança do antagonista, visando a produção futura de um bioproduto. A partir dos resultados apresentados neste estudo, foi possível concluir que a região ITS foi suficiente para confirmar a espécie, porém a utilização das duas regiões (ITS e D1/D2) para a construção de uma árvore multilocus aumentou a precisão quanto a distinção entre os isolados da mesma espécie; o melhor meio de cultura para o crescimento de S. koalae foi o Sabouraud, que quando suplementado ... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Among the post-harvest diseases that occur in citrus, there is the sour rot, caused by Geotrichum citri-aurantii, which affects fruits of all species in crop-producing countries. There are no fungicides registered for control in Brazil. This work aims to continue the studies of the yeast Sporobolomyces koalae, which in previous studies showed potential to control the disease, having as specific objectives: (i) phylogenetic analysis for confirmation of species for ACBL-42 (Sporobolomyces koalae); (ii) verify the effect of different culture media on production of yeast cells; (iii) determine growth curve of S. koalae; (iv) verify the effect of nutritional sources in the culture media for the antagonistic activity; (v) verify mechanisms of action that may be involved in the control of G. citri-aurantii, (vi) to initiate the biosafety studies of the antagonist, aiming a future production of a bio-product. From the results presented in this study, it was possible to conclude that the ITS region was sufficient to confirm species, but the use of two regions (ITS and D1/D2) for the construction of a multilocus tree increased the precision regarding the distinction among isolates of the same species; the best culture medium for S. koalae was Sabouraud, which when supplemented with 1% sucrose or 0.05mM copper sulfate, was able to favor biofilm production and antagonism; there is no production of siderophores and, finally, S. koalae does not present proinflammatory effects in tests of c... (Complete abstract click electronic access below) / Mestre
|
310 |
Phylogeny and taxonomic reexamination of the genus Dioscorea (Dioscoreaceae) / ヤマノイモ属(ヤマノイモ科)の系統と分類学的再検討Noda, Hiroshi 25 May 2020 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(理学) / 甲第22631号 / 理博第4620号 / 新制||理||1664(附属図書館) / 京都大学大学院理学研究科生物科学専攻 / (主査)教授 田村 実, 教授 工藤 洋, 教授 永益 英敏 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DGAM
|
Page generated in 0.0325 seconds