Jeniffer Grabias

Enraizamento de estacas de Tibouchina moricandiana var. vinacea em função da forma de aplicação e concentrações de AIB

Tibouchina moricandiana Baill. var. vinacea Handro is a woody shrub, native to Brazil with ornamental potential. The objective of this study was to evaluate the feasibility of cutting the vegetative propagation of the species according to the application form and different concentrations of indole butyric acid (IBA). Softwood cuttings were treated with 0, 1,000 and 2,000 mg kg -1 /mg L -1 of IBA in powder and solution form. After 56 days the treatments were evaluated for rooting, cuttings with callus, survival, mortality, leaf retention, new shoots, number of roots per cutting and root length. The rooting of stem cuttings of T. moricandiana was negatively influenced by the concentrations of IBA or by way of application. The species has a high strike rate (90.8%), demonstrating a species with potential for vegetative propagation through cuttings. The form of application and concentration of IBA influenced other variables. The use of 2,000 mg kg -1 IBA applied by talc demonstrated a decrease in the number of roots and provided the greatest number of and unrooted live cuttings. The length of the three longest roots per cutting was higher with the use of 1,000 mg L -1 or mg kg -1 of IBA. The use of IBA for the rooting of cuttings can be dispensed with, but can be used at a concentration of 1,000 mg -1 or mg kg -1 to increase the length and number of roots.

Qualidade de sementes e mudas de Cedrela fissilis Vell. em função da biometria de frutos e sementes em diferentes procedências

Cedrela fissilis is a Brazilian native species with outstanding use in the timber sector and in the recovery of degraded areas. There is a need for a better understanding of the differences and genetic gains that may exist in relation to different origins and progenies. The objective of the study was to analyze the biometry of fruits and seeds of Cedrela fissilis as a function of different origins and matrices related to the initial growth of seedlings, besides evaluating the best photoperiod in germination. The seeds were collected in matrices from two sources (Fernandes Pinheiro and Lapa) for biometry and the weight of one thousand seeds per matrix. Seeds of the two provenances were submitted to different photoperiods (12, 16 and 24 hours of white light and 24 hours in the dark), the germination and the germination rate index (ORI) was evaluated. The initial growth of the seedlings was evaluated through the measurement of morphological characteristics after every 30 days. The experiments were performed in a completely randomized design and the data submitted to analysis of variance at the 5% level, the averages being compared by the Tukey test and/or polynomial regression. There were biometric differences between fruits and seeds between the matrices, with no relation to the origin. Regarding the germination rate and ORI among the provenances, Fernandes Pinheiro presented the best results. In relation to the photoperiod, there was no difference in germination in relation to light levels, and the ORI was higher for seeds germinated in the dark. Fernandes Pinheiro obtained higher initial growth of the seedlings in relation to the Lapa origin and this difference increases throughout the evaluations. In general, the experiments showed a difference between the provenances, having a relation with the quality of seeds and seedlings formed.

Caracterização morfológica de fruto, semente e plântula de Psidium rufum DC. (Myrtaceae)

The objective of this study was to describe and illustrate the morphology of fruits, seeds and seedlings of Psidium rufum DC. in order to assist diff erent disciplines, such as taxonomy and forestry. The species is a fruit that is not cultivated, but has great ecological potential. For structure characterization and germination stage descriptions, 100 units of random fruits and seeds of Curitiba and Ponta Grossa, Parana were used. P. rufum fruit is smooth, shiny, hairless, with a red-purple color when ripe, so globosa, fl eshy and indehiscent type bacoide. The seeds are campylotropous, reniform, with smooth, opaque and stony seed coat, and presented a possible endospermatic tissue and linseed in cream coloring. The embryo is of the pimentoide type and germination is epigeous phanerocotyledonal, starting on day 15 and extending to day 37. The morphological characteristics presented are useful in helping identify P. rufum.