Indução floral em plantas de sabiá (Mimosa caesalpiniifolia) com aplicação de paclobutrazol.

[Flowering induction in sabia plants (Mimosa caesalpiniifolia) with paclobutrazol]. Abstract: The presence of thorns dominant character in sabiá, makes it difficult their exploitation which makes it necessary to apply genetic improvement techniques, to select plants that do not show this trait. To expedite the improvement, the use of bioregulators may be an alternative, as the paclobutrazol (PBZ), to induce flowering, aiming to reduce the time for selection. Four doses It was tested four doses of PBZ applied for five months from the fourth month after sowing. The results of four early flowering plants at eleven months were obtained in seasons 5 and 6 with doses of 1 ml and 2 ml of PBZ. There was evidence that the PBZ contributed to the early flowering since the control treatment did not show similar results. We concluded that the absence of thorns on ?sabiá? is a recessive character because many plants exhibited the presence of thorns after germination, even collected from a population without thorns. The induction of flowering at eleven months of age was related to the use of PBZ

Factors controlling spatio-temporal variation in carbon dioxide efflux from surface litter, roots, and soil organic matter at four rain forest sites in the eastern Amazon

[1] This study explored biotic and abiotic causes for spatio-temporal variation in soil respiration from surface litter, roots, and soil organic matter over one year at four rain forest sites with different vegetation structures and soil types in the eastern Amazon, Brazil. Estimated mean annual soil respiration varied between 13-17 t C ha(-1) yr(-1), which was partitioned into 0-2 t C ha(-1) yr(-1) from litter, 6-9 t C ha(-1) yr(-1) from roots, and 5-6 t C ha(-1) yr(-1) from soil organic matter. Litter contribution showed no clear seasonal change, though experimental precipitation exclusion over a one-hectare area was associated with a ten-fold reduction in litter respiration relative to unmodified sites. The estimated mean contribution of soil organic matter respiration fell from 49% during the wet season to 32% in the dry season, while root respiration contribution increased from 42% in the wet season to 61% during the dry season. Spatial variation in respiration from soil, litter, roots, and soil organic matter was not explained by volumetric soil moisture or temperature. Instead, spatial heterogeneity in litter and root mass accounted for 44% of observed spatial variation in soil respiration (p < 0.001). In particular, variation in litter respiration per unit mass and root mass accounted for much of the observed variation in respiration from litter and roots, respectively, and hence total soil respiration. This information about patterns of, and underlying controls on, respiration from different soil components should assist attempts to accurately model soil carbon dioxide fluxes over space and time

Pretibial myxoedema: a case report with scanning electron microscopy.

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Indução de tetraploides em citros via deficit hídrico.

A citricultura possui grande importância sócia econômica para o agronegócio brasileiro, por gerar uma grande demanda de produção de frutos e sucos. Para tanto, é necessário que se invista nesse segmento, tendo em vista a segurança do pomar e melhores características agronômicas e fitossanitárias de interesse para os citricultores

Relationship between the light intensity and the distance from eucalyptus strips in pasture.

The recovery of degraded pastures can be done by integrated crop-livestock-forest systems (CLFS). Improving ambience for livestock without economically affecting production in this kind of system depends on orientation, length and surface area of shades projected by trees. Therefore, this study aimed to evaluate the shading of eucalyptus strips in the pasture