https://repositorio.ufra.edu.br/jspui/handle/123456789/60 2026-04-16T11:36:02Z 2026-04-16T11:36:02Z 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 PAIXÃO, Álex Pena https://repositorio.ufra.edu.br/jspui/handle/riufra/2781 2026-01-13T20:59:06Z 2026-01-13T00:00:00Z

Título: Reflexões sobre o ensino de anatomia vegetal: formação, prática e obstáculos conceituais na perspectiva do professor. Autor(es): PAIXÃO, Álex Pena Abstract: Brazil hosts the greatest plant biodiversity on the planet, with approximately 60,000 species distributed across different biomes, playing essential roles in ecosystems and human life. Despite the extensive scientific knowledge about the national flora, there is a gap between this knowledge and its effective integration into Botany education, which is often addressed in a fragmented and poorly contextualized manner. This gap contributes to so-called “plant blindness,” hindering the appreciation of plants and the development of critical environmental awareness. This dissertation investigated the role of initial and continuing teacher education in improving the teaching of Botany, with an emphasis on Plant Anatomy, in basic education. It analyzed conceptual obstacles faced by Biology teachers, alumni, and students of a professional master’s program in Biology Teaching at a federal public university in Belém, Pará. The research involved 60 primary and secondary school teachers and used an online questionnaire structured around three axes — Initial Training, School Practice, and Conceptual Obstacles — analyzed through Content Analysis. The study is composed of two articles: the first, “Teaching Plant Anatomy in Basic Education: Issues of Teacher Training and Practice in Botany Teaching,” discusses the relationship between teacher education and pedagogical practice; the second, “Conceptual Obstacles in Plant Anatomy among Biology Teachers — How Long Will We Ignore Them?” examines major conceptual difficulties, their implications for teaching, and strategies for improvement. Both studies converge on a central diagnosis: the teaching of Plant Anatomy in basic education remains constrained by persistent conceptual obstacles, a predominantly traditional and memorization-based teacher education, and didactic procedures that rely heavily on textbooks — often marked by gaps and inaccuracies. Within this context, teachers enter the classroom with limited conceptual and didactic confidence, tending to reproduce expository methodologies that are insensitive to the complexity of the subject and students’ experiences. At the same time, evidence of professional growth emerges: investment in continuing education, adoption of diversified methodologies, and creative use of material resources to reconfigure the learning experience in Botany into something meaningful and socially grounded. This research contributes to the development of formative and pedagogical frameworks for teaching Plant Anatomy and to teacher education policies, encouraging the articulation between theory and practice through meaningful, contextualized, and interactive methodologies that strengthen botanical education and environmental awareness.

2026-01-13T00:00:00Z