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Accueil du site → Master → Brésil → 2019 → Caracterização física e potencial fisiológico de lotes de sementes de Amburana cearensis (Allemão) A.C. Smith

Universidade Federal de Alagoas (2019)

Caracterização física e potencial fisiológico de lotes de sementes de Amburana cearensis (Allemão) A.C. Smith

Porcino, Gisliane Osório

Titre : Caracterização física e potencial fisiológico de lotes de sementes de Amburana cearensis (Allemão) A.C. Smith

Physical and physiological potential characterization of Amburana cearensis (Allemão) seed lots A.C. Smith

Auteur : Porcino, Gisliane Osório

Université de soutenance : Universidade Federal de Alagoas

Grade : Mestrado em Agronomia 2019

Résumé
Amburana cearensis (Allemão) A. C. Smith, belonging to the Fabaceae family, it is a native species of caatinga biome, also known by “amburana” and others same popular names in Brazil according to region, which has potential in the recovery of degraded areas, landscape design and pharmaceutical industry. The present work was developed aimed of physically characterize the seeds, and to study the methodologies for use in tests of emergency, tetrazolium, and conductivity electrical to evaluation of the physiological potential of seeds of A. cearensis deriving from different lots. For the physical characterization, eight repetitions of 100 seeds were weighed and evaluated for length, width and thickness. In germination test the were analyzed the follow variables : percentage, first count, germination speed, length and dry mass of root and shoot. For the emergency test, sowing was carried out in beds, the temperature and relative humidity of 30 °C and 75%, respectively, were analyzed : percentage (first and final count) and emergence speed, length and dry mass of the root and shoot. Moisture was obtained with a triplicate of 5 g at 105 °C for 24 hours in drying oven. The electrical conductivity was conducted with four repetitions of 50 seeds for each lot and the tetrazolium test was accomplished with manually scarified seeds, being immersed directly in distilled water for 24 hours, at 35 oC, and after total removal of the integument. Then, were then immersed in 0.05 % solution of 2,3,5-triphenyltetrazolium chloride salt for three hours at 40 °C under dark conditions. The experimental design was completely randomized with four replications of 25 seeds (50 seeds for electrical conductivity) for each test and lot. For the emergency test, a randomized block design was used. Results indicated great variation in seed length, width and thickness for the different lots used. According to weight of one thousand, it was found a significant variation with emphasis on the seeds represented by the L1 lot with the lowest values compared to the other lots studied. How much the physiological potential, it was found superiority of the seeds represented by lots L1, L4 and L6 for the variables, germination, first count, GSI, seedling length, dry mass and emergence in field. Among the L1 and L6 lots, stood out as more vigorous by the electrical conductivity test. Tetrazolium test showed the difference between each lot vigor levels as well as the type of damage that was done to the seed.

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