Seleção de árvores matrizes de combretum leprosum Mart. com base na qualidade de sementes

Abstract

Mofumbo (Combretum leprosum Mart.) is an endemic tree species of the Caatinga biome, widely used as a source of forage, in projects for the recovery of degraded areas and in pharmacology, from the extraction of chemical compounds. In view of its relevance, this study aimed to evaluate the physical and physiological quality of seeds between parent trees of Combretum leprosum in two populations, in order to select individuals with a high quality standard. In the municipalities of Itajá - Rio Grande do Norte and São João do Cariri - Paraíba, 8 mother trees of mofumbo per population were selected, after collecting the seeds, they were sent to the Seed Analysis Laboratory of the Center for Agricultural Sciences of the Federal University of Paraíba. The analyzes carried out were: digital biometry of seeds (mm), water content (%), germination (%), germination speed index, average time of germination, total dry mass of seedlings (g), emergence (%), emergence speed index, mean emergence time and total seedling dry mass (g). The experimental design used was completely randomized and means were compared using the Scott-Knott test at the 1% probability level. Based on the results, the physical and physiological quality of Combretum leprosum seeds varies between populations, as well as within the same locality. Computerized morphometric aspects show changes in the pattern between parent trees, which can be used for studies of genetic divergence within population dynamics in the same locality. Mother trees 1, 3, 6, 8, 9, 12, 14, 15 and 16 stand out in the percentage of germination, however, in relation to vigor, individuals 1, 3 and 8, demonstrated greater performances within the set of analyzed variables.