Programa de Pós-Graduação em Ciências Biológicas/Botânica Tropical https://repositorio.ufra.edu.br/jspui/handle/123456789/19 2026-04-16T11:38:26Z 2026-04-16T11:38:26Z FERNANDES, Géssica Elaine Azevedo https://repositorio.ufra.edu.br/jspui/handle/riufra/2853 2026-03-23T15:16:26Z 2025-08-31T00:00:00Z

Título: Revisão taxonômica das espécies de Tabernaemontana L. (Apocynaceae) da Amazônia brasileira, Brasil. Autor(es): FERNANDES, Géssica Elaine Azevedo Abstract: The Apocynaceae family stands out as one of the most representative within the angiosperm group, comprising approximately 378 genera and 5,350 species. In the Brazilian context, this family is distributed across 96 genera and 977 species, encompassing all biomes present in the country. Among the five subfamilies that constitute the Apocynaceae family, only three are present in Brazil, namely Rauvolfioideae, Apocynoideae, and Asclepiadoideae. The subfamily Rauvolfioideae consists of 12 tribes, with the Tabernaemontaneae tribe standing out as one of the most diversified. Within this tribe, the genus Tabernaemontana, inserted into the Tabernaemontanenae subtribe, emerges as one of the most diversified, comprising over 120 species. Among these, 46 occur in the neotropics, with 30 recorded in Brazil, and of these, 25 in the Brazilian Amazon region. The taxonomy of the Tabernaemontana genus reveals a complex and extensive history marked by significant changes in its circumscription and species recognition, especially in the Amazonian regions where nomenclature and taxonomy were less explored. Recent phylogenetic studies have recognized the genus as monophyletic, including the neotropical genus Stemmadenia. However, the infrageneric circumscription remained ambiguous, demonstrating monophyly only in the Peschiera and Rejoua sections, while other sections exhibited paraphyly. Despite the abundance of Amazonian species, some were not included in the previous phylogeny. The last taxonomic revision of the genus, conducted in the 1990s, proposed seven sections based exclusively on morphological characters. Among these, only two (Bonafousia and Peschiera) have representatives in Brazil, which were the focus of the present study. The objective of this study was to conduct a systematic approach to Tabernaemontana in the Brazilian context, with an emphasis on species occurring in the Amazon, as well as a nomenclatural revision of the discussed species. To achieve this, a comprehensive taxonomic treatment was developed, including detailed descriptions, identification keys, maps of geographic distribution and diversity, as well as considerations on phenology and conservation status. Samples of the genus were analyzed in the IAN, INPA, MG, UFACPZ, RON herbaria in person, while others were requested on loan or analyzed online through digitized images available in foreign and national herbaria databases. Over 4,000 specimens were analyzed in person, resulting in the development of three thesis chapters, encompassing the treatment of 207 names, of which 25 were accepted, 18 lectotypifications, two neotypifications, one epitypification, the proposition of a new name, the reinstatement of a species, and the description of a new species for science.

2025-08-31T00:00:00Z ARAÚJO, Maria Elanne da Silva https://repositorio.ufra.edu.br/jspui/handle/riufra/2850 2026-03-20T18:14:38Z 2026-03-13T00:00:00Z

Título: Secagem de frutos e fazes de maturação de sementes de Pentaclethra macroloba (Willd.) Kuntze (Lguminosae, Caesalpinioideae) provenientes de várzea alta e baixa. Autor(es): ARAÚJO, Maria Elanne da Silva Abstract: Pentaclethra macroloba (Willd.) Kuntze seeds exhibit heterogeneous maturation and are dispersed with high water content, making them more susceptible to deterioration and difficult to harvest. Therefore, the study aimed to evaluate the influence of drying on the physiological quality of P. macroloba seeds collected in different floodplain conditions and maturation stages. The fruits were collected in high and low floodplain environments, in three maturation stages (P1: green; P2: yellowish-green; P3: black), and were subjected to artificial drying at 23°C for seven days. The seeds were analyzed for water content, viability and vigor. The results showed that the seeds of stage 3 presented the greatest physiological potential and vigor, followed by stage 2, with superior performance in the seeds from the low floodplain. Seed mortality was not influenced by drying. In addition, drying promoted greater uniformity in the germination process. It is concluded that P. macroloba seeds can be harvested in phase 3, in a low-lying floodplain environment, ensuring the maintenance of physiological quality. These findings are important for management and conservation practices of the species, contributing to sustainable use and production of high-quality seedlings.

2026-03-13T00:00:00Z CALDAS, Mayara Dias https://repositorio.ufra.edu.br/jspui/handle/riufra/2834 2026-03-10T18:03:09Z 2026-03-10T00:00:00Z

Título: Taxonomia de Ochnaceae DC. (Malpighiales) do Estado do Maranhão, Brasil. Autor(es): CALDAS, Mayara Dias Abstract: The state of Maranhão has a unique vegetation structure, which, as an ecotone region, tends to contain species from both the Amazon and Cerrado domains. Although it has many published floristic surveys, especially in the coastal zone, the state still lacks more in-depth taxonomic treatments of specific taxa, such as Ochnaceae. Ochnaceae belongs to the order Malpighiales and has approximately 642 species distributed in 37 genera. Of the 210 species occurring in Brazil, only 16 have been recorded in Maranhão to date distributed in two genera: Ouratea Aubl., with 13 representatives, and Sauvagesia L., with three. Aiming to confirm the occurrence of these species and gather new data on the taxonomy of the family in the state, we present in this work the taxonomic treatment of Ochnaceae from the state of Maranhão, based on collecting expeditions on São Luís Island, campinaranas environment in the extreme west of the state, part of the Legal Amazon in the Gurupi Biological Reserve, and analysis of the herbaria collections BMA, CCAA, HABIT, MAR, and SLUI in Maranhão, IAN and MG in Pará, CEN and UB in the Federal District, in addition to specimens available in virtual collections. As a result, six new records were identified based on the Flora e Funga do Brasil: three in Ouratea—O. parvifolia (A.St.-Hil.) Engl., O. salicifolia (A.St.-Hil. & Tul.) Engl., O. spectabilis (Mart.) Engl.—and three in Sauvagesia—S. deflexifolia Gardner, S. sprengelii A.St.-Hil. and S. tenella Lam., as well as one new synonym. This volume also reports on Dr. Emil Snethlage's travel in Maranhão and the importance of his collections for Ochnaceae. The new records and nomenclatural changes demonstrate the importance of taxonomic work even in locations with good sampling, especially when involving fieldwork. This work is relevant for recognizing local flora, updating species distribution data in the state, and for providing information that can support future biogeographic, molecular, and ecological research.

2026-03-10T00:00:00Z PINHEIRO, Marcilene da Silva https://repositorio.ufra.edu.br/jspui/handle/riufra/2813 2026-02-12T20:38:59Z 2026-01-12T00:00:00Z

Título: Potencial da regeneração natural de Virola surinamensis (Rol. ex Rottb.) Warb. em florestas inundadas com e sem exploração madeireira na Amazônia Oriental. Autor(es): PINHEIRO, Marcilene da Silva Abstract: Actually, there are many studies testing the effect of flood in the Amazonian floodplain forests plants. However, the majority performed in the community level. There area few studied performed in population level, mainly in plant species with economic values. The species Virola surinamensis is a typical dioecious tree in the Amazonian floodplain forests with great economic importance due the value of wood used by timber industry. These uses result in a drastic reduction of natural population of this species in the natural conditions. The objectives ofthis study are: (1) Compare to density of seedlings established between the igapo and varzea floodplain forests without human intervention; (2) Compare to density of seedling established in three locations submit the different wood extractions; (3) Compare to seed germination, the growth between the varzea and igapo floodplain forests without human intervention and (4) Compare to survival and biomass production of seedling established in three different level of inundation. All studies were carried in the estuarine floodplain forests in the Pará State, Brazil. In the objectives 1 and 2 were establish 20 plots of 2 x 2 meters in the igapo and varzea floodplain forests unexploited and also in the three locations subject to different levels of timber extractions. In the objective 3 were collected seeds of Virola in the igapo and varzea floodplain forests unexploited. In the germination and growth experiments were divided in four treatments: T1-Seeds of igapo planted in igapó soils; T2-Seeds of varzea planted in igapo soils; T3-Seeds of varzea planted in várzea soils and T4- Seeds of igapо planted in varzea soils. The measured data were height and diameter of plants and dry mass of leaves, stems and roots. In the flooding experiment the plants were divided in three treatments: (1) control (without food); (2) partially flood and (3) total flood. The experiment had duration of 120 days and also was measured of height of plants, the total number of leaves and the formation of lenticels and adventitious roots. The density of seedling was significantly lower in the igapo forest in comparison to varzea. The relative frequency of seedling in the plots varied from 30% in the areas with actual timber exploration and areas exploited and abandoned to 85% in the areas without timber exploration. There is no difference in the seedling germination between the varzea and igapo soils. However, the seeds planted in the varzea soils have higher increment in height and dry biomass. The seedlings of Virola are tolerant to flood. The plants totally submerse had a significantly decreased in the mean height in comparison the plants partially food and the control (not flood) that grown on average 7.3% and 8%, respectively. There was no variation in biomass production in plants among the treatments. In the partially and fully submerged plants presented morphological modifications, such as, the formation of lenticels and adventitious roots and the presence of chlorosis and foliar senescence.

2026-01-12T00:00:00Z