Seed biometrics is an excellent tool for understanding environmental filters, species potential and dispersal, successional stages of communities and the dynamics used by seeds to germinate, establish and develop, thus constituting a functional trait of the species. We aim to understand the relationship between aspects of seed biometrics and other phenological traits, in order to infer contributions about functional strategies in Caatinga. Between September 2017 and January 2019, 10 individuals of Cenostigma pyramidale (Tul.) LP Queiroz, Commiphora lepthophloeos (Mart.) JB Gillett, Jatropha mollissima (Pohl.) Baill., Monteverdia rigida (Mart.) Biral. Pseudobombax marginatum (A.ST.-Hil) A. Robyns, Zizyphus joazeiro Mart. were monitored for the selection of three seed collection matrices. From each matrix 100 seeds were collected, which after screening resulted in 35 intact seeds that were used to measure length, width, thickness and volume. Caatinga seeds are generally small, as a result of the environmental stresses of the Brazilian semiarid. The analyzed variables separated three groups in the PCA. We noticed that these groups evidenced the successional stages in the Caatinga. One group included M. rigida and P. marginatum, which are late secondary. C. pyramidale and C. lepthophloeos formed another group coincident with intermediate successional stages. J. mollissima and Z. joazeiro formed a group of pioneer species in anthropized environments. Another finding was that the area was in secondary succession. The pioneer species presented the largest seeds and this characteristic is associated with the need for nutrient reserve that allows the embryo to germinate and last for a longer period without the need for exogenous nutrients, an essential condition for the Caatinga. With the advancement of ecological succession and the establishment of a more consolidated plant community, competition for resources, the frequent dispersion vector type and the nature of the environmental stresses present, the seeds may be smaller.
A utilização de técnicas sustentáveis para a melhoria da germinação e vigor de sementes florestais como as técnicas de Primings tem sido difundida na atualidade. O Hydropriming (imersão em água) e o Biopriming (veiculação de agente biológico) têm sido estudadas no mundo inteiro, porém ainda foram pouco estudadas com sementes da Caatinga. Assim, o objetivo desta pesquisa foi testar a possibilidade da promoção de vigor e germinação em sementes provenientes do bioma Caatinga pela utilização em conjunto de Biopriming e Hydropriming. Assim, esta pesquisa teve como espécies trabalhadas Ceiba speciosa, Pseudobombax marginatum, Handroanthus impetiginosus, Tabebuia aurea, Anadenanthera colubrina, Libidibia ferrea e Cenostigma pyramidale, tratadas em imersão (25±2°C por 24h) em solução aquosa com a presença de Trichoderma, ou não (controle, imersão em água destilada). Após, foram semeadas em papel germitest e avaliadas quanto a variáveis de germinação e vigor, em condições de laboratório. Em relação aos resultados obtidos nesta pesquisa, a promoção de vigor e germinação em sementes provenientes do bioma Caatinga pela utilização em conjunto de Biopriming e Hydropriming não foram alcançadas com sementes de Ceiba speciosa, Pseudobombax marginatum, Handroanthus impetiginosus, Tabebuia aurea, Anadenanthera colubrina, Libidibia ferrea e Cenostigma pyramidale nas condições referidas nesta pesquisa. Pesquisas com esta mesma temática, com o uso de padrões diferenciados podem ser úteis para que se possa promover vigor e germinação em relação às espécies trabalhadas.
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