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Resumo 01: (Trabalho realizado durante a disciplina de PTS)
Título: TEMPERATURE AND SUBSTRATE ON THE GERMINATION OF Amburana cearensis (Allem.) A. C. Smith.
Autores: Kilson Pinheiro Lopes; Cláudio Ferreira Barreto; Mateus Cardoso da Costa Lages ; Sanderlei Oliveira de Andrade; Sandro Leite de Azevedo e Tamires Tavares de Araújo.
Amburana cearensis (Allemão) A.C. Smith is a native of northeastern Brazil, which is of great importance due to its multitude of uses. This study aimed to evaluate the influence of substrate and temperature on seed germination of Amburana cearensis (Allem.) A. C. Smith. The experiment was conducted in a randomized design with treatments arranged in a factorial design (4 x 3), the first factor referring to the four temperatures (30, 35, 40 °C constant and alternating 20-30 °C) and the second factor the three substrates (rolled paper, sand and substrate Plantmax®) in four replicates of 25 seeds. We analyzed the following characteristics: germination percentage, rate of germination and seedling length. The constant temperatures of 30 and 35 °C appeared to be within the optimum range for seed germination Amburana cearensis, ensuring the highest percentages of germination when the substrates sand or Plantmax® were used. However, a higher germination rate and consequently further developed seedlings were obtained when the sand substrate was used at a constant temperature of 30 °C.
Keywords: Forest seeds, physiological quality, cumaru.
Resumo 02: (Trabalho realizado durante a disciplina de PTS)
Título: DORMANCY BREAK IN SEEDS OF Clitoria ternatea L.
Kilson Pinheiro Lopes; Saul Ramos de Oliveira; Túlio Augusto Dantas e Roberta Chaine Almeida Barbosa.
Clitoria ternatea is a tropical forage of optimal nutritional qualities, drought resistant and ideal for sandy soils and adapts to different types of weather. Its seeds can take time to germinate because of possible dormancy caused by a coat that is impermeable to water. Aiming to determine the best method to overcome dormancy in the laboratory, the Clitoria ternatea seeds were subjected to treatments that consisted of: immersion in water at initial temperature of 80 °C then cooling for 30 minutes; immersion in concentrated sulfuric acid for 5 and 10 minutes; immersion in sodium hypochlorite for 30 minutes; mechanical scarification with sandpaper N° 80 and a control with intact seeds. Immersion in concentrated sulfuric acid independent period of time, immersion in sodium hypochlorite for 30 minutes and mechanical scarification on sandpaper N° 80 resulted in the highest values of germination and vigor. Soaking in water at 80 °C was not effective in overcoming dormancy of Clitoria ternatea seeds, with values of germination and vigor similar to the intact control seeds.
Keywords: Leguminosae, germination, pre-germination treatments
Resumo 03: (Trabalho realizado por estagiários do LABASEM)
Título: PREGERMINATING TREATMENTS IN Parkinsonia aculeate L. SEEDS.
Eugênio Silva Araújo Júnior; Kilson Pinheiro Lopes; Maria das Graças R. do Nascimento e Roberta Chaiene Almeida Barbosa.
The species Parkinsonia aculeate L. is a legume tree that was introduced in several countries for ornamental purposes, and may also be used for hedges, erosion control and dunes stabilization. Seeds have dormancy problems, probably due to the impermeability of the coating to water, which is the most common cause of dormancy seeds in leguminous species. The aim of this study was to evaluate the effect of pre-germination treatments that could maximize the germination process of this species. We tested the following treatments: mechanical scarification with sandpaper of N° 80 (T1), a cut in the distal portion of the seed (T2), immersion in sulfuric acid for 3, 6 and 8 minutes (T3, T4 and T5, respectively ), immersion in water at 60, 70 and 80 °C for one minute (T6, T7 and T8, respectively), immersion in water at room temperature for 24, 48 and 72 hours (T9, T10 and T11, respectively) and intact seeds, which corresponded to the control (T12). The results confirmed that dormancy was caused by the impermeability of the coating to water. Dormacy was overcome when seeds were subjected to pre-germination treatments where a cut in the distal region of the seed (T2) was used, followed by immersion sulfuric acid, independent of the time period (T3, T4 and T5).
Keywords: Forest seed, germination, dormancy.
Resumo 04: (Trabalho realizado por estagiários do LABASEM)
Título: DORMANCY BREAK IN SEEDS OF Delonix regia Raff.
Maria das Graças R. do Nascimento; Kilson Pinheiro Lopes e Roberta Chaiene Almeida Barbosa.
Seeds of Delonix regia Raff., Leguminosae, were subjected to the following pre-germination treatments in the laboratory to determine the best method for breaking dormancy: scarification with sandpaper N° 80; scarification by sandpaper mechanics for 3 minutes at 1750 rpm; immersion in concentrated sulfuric acid for 15 minutes soaking in water (25 °C) for 24 hours, and control, with untreated seeds. The parameters normal germination, abnormal seedlings, seed dormancy and emergence rate of seedlings were assessed through regular evaluation of germination. The results showed that among the pre-germination treatments used, only scarification with sandpaper N° 80, followed by mechanical scarification promoted germination. The other treatments had similar resukts to the control and showed elevated levels of dormant seeds.
Keywords: Forest seeds, germination, scarification, seed coat permeability.
Resumo 05: (Trabalho realizado por bolsista PIBIC e colaboradores)
Título: SEED BANK OF Caesalpinia ferrea Mart. Ex Tul. INTRODUCED IN THE SOIL OF PRESERVED AND DEGRADED CAATINGA.
Kilson Pinheiro Lopes; Emanuel Abrantes Dantas; Roberta Chaiene Almeida Barbosa e Caciana Cavalcanti Costa.
The present study was to evaluate the seed bank of Caesalpinia ferrea Mart. ex Tul. in the soil of Caatinga with different conditions of vegetation cover. For this, seeds were placed in gauze bags (20 x 30 cm) and kept on the ground or buried at 5 cm soil under natural conditions, in an area characterized by a Caatinga with good vegetation cover (preserved) and another area of scrub with little or no vegetation (degraded). Seeds subjected to such conditions were evaluated for a period of 240 days, the seed samples taken every 60 days from the introduction of seed banks in soil to determine the number of intact seeds, damaged seeds and germinated seeds. When they are kept in a seed bank on the ground, seeds of Caesalpinia ferrea remain viable for 120 days under natural conditions of Caatinga with a good scrub vegetation (preserved) and scrub of little or no vegetation (degraded). When buried under 5 cm of soil, seeds lose their viability after 60 days in the Caatinga environment preserved or degraded. Seeds kept on the ground in either Caatinga environment have a higher percentage of damaged seeds, while those stored at 5 cm depth have a higher percentage of germinated seeds and are able to establish new plants in an area of Caatinga, whether preserved or degraded.
Keywords: Land cover, ecology of seeds, tree seeds, viability.