Rita de Cássia Pompeu de Sousa

Tratamentos pré-germinativos em sementes de acácia

The study was conducted to study the time of water imbibition required to overcome acacia seed dormancy. A randomized experimental design with four replicates of 50 seeds/treatment was used. In addition to the control, which consisted of intact seeds with no previous treatment, the following treatments were considered: seed immersion in boiling water at 100°C, for 30, 45, 60 and 75 seconds; subsequently, half the seeds were maintained immersed for 12 hours in ambient (27°C) water, totalizing nine treatments. After that, the seeds were incubated at 25°C, constant temperature, inside a plastic gearbox with moistened germitest filter paper as substrate and maintained in germination chambers during assessment. Through regular assessment, the parameters germination, imbibition and number of normal seedlings after 18 days were determined. The daily counting of germinated seeds took place for 18 days. The results show that maximum seedling emergence was obtained in 100 oC water, without posterior immersion in ambient water; this temperature and the period of 1 minute are remarkable, as they present the highest germination and represent operational standardization as a method to be utilized in Acacia mangium seed procedures to overcome the tegument hardness of this species.

Minerals in Aqueous Extract of the Coproducts Myrciaria dubia (Kunth.) McVaugh, Myrtaceae

The camu-camu of fruits (Myrciaria dubia (HBK) McVaugh, Myrtaceae) arising from Amazonia, are considered a major source of vitamin C in the world. There are still important sources of different bioactive compounds and good source of minerals such as sodium, potassium, calcium, zinc, magnesium, manganese and copper. However, the processing of these fruits for extraction of the pulp, the product of greatest interest to many consumption, creates an effective quantity of different wastes, solid and liquid, capable of utilization for various uses its technological potential is studied. Thus, this work aimed at determining, quickly, via direct condutometric electroanalytical method, the amount of dissolved minerals contained in the aqueous extract of processed seeds and peels, coproducts of Myrciaria dubia, with potential use in the area of biotechnology development. The samples used for the study come from the experimental processing of fruit camu-camu. Three coproducts (byproducts/waste) named: CF, CS and SSC also processed via Standard Operating Procedure (SOP) created in our own laboratory for the study of organic waste. Analyzing the results obtained it was found that the samples CF and SSC showed higher electrical conductivity, which characterizes them as a rich source of electrolytes, showing greater ability to exchange ions to the solution, which can be characterized as a nutrient solution. Conductivity values obtained from samples from CF, CS and SSC outweigh some brands of bottled water sold in the Brazilian market, ranging from 32 to 72% when compared to the highest value obtained, 408,0 S.cm at 25°C, considered as a nutrient solution of high value rich in minerals. The conductometry technique was effective for rapid determination of total dissolved coproducts of processed fruit samples camu-camu minerals. It also made possible by the high mineral contents, characterize them as nutrient solution, with potential for exploitation in the area of biotechnology

Morfometria e crescimento inicial de Copaifera pubiflora exposta à terra vegetal produzida em compostagem

This research aimed to assess the emergence and initial growth of Copaifera pubiflora Benth. (copaibeira) exposed to vegetable land produced in school composting. The seeds of C. pubiflora were collected in the area of the riparian forest of Boa Vista, Roraima and classified as size (small or large) and performed the biometric characterization (length, diameter and mass of the seed). The experiment consisted of six different doses of vegetable land (0, 20, 40, 60, 80 and 100%) in sterile sand. The variables evaluated responses were: emergency percentage of seedlings, height of the aerial part, diameter of the stem and dry matter of seedlings. There was significant difference in the quality of seedlings of C. pubiflora cultivated according to the size of seeds and doses of vegetable land. Plants originating from large seeds have better quality in the measured variables. The use of vegetable land in doses greater than 20 and 40% interferes negatively in the emergence of small and large seeds of C. pubiflora, respectively. The initial growth of plants from C. pubiflora is benefited when using doses of up to 60% of vegetable land and 40% of sterile sand, for both seed sizes.