4 research outputs found
Soybean response (Glycine max L.) under the use of biostimulants: A literature review
Soybean (Glycine max L.) is a crop with prominence in Brazil and worldwide. The increase in soybean production and production capacity is associated with scientific and technological advances in the productive sector. One of these advances is the use of biostimulants. In this sense, this work aimed to review current knowledge about the effects of biostimulants on soybeans, highlighting the direct or indirect response of the plant when using such substances. This review was carried out through a research with a qualitative approach, being considered a literature review of the narrative type, using other studies and research at the same theme, in high impact magazines from the last five years or more that were relevant to the study, with subsequent critical reading about the subject. Based on found results, it is clear the use of biostimulants in soybeans is a potential alternative input for increasing the growth and development of the crop, as they are able to provide increments in its productive variables. However, further research is needed in order to provide better information on agronomic interests
Light and electron microscopy of Myxobolus sciades n. sp. (Myxozoa), a parasite of the gills of the Brazilian fish Sciades herzbergii (Block, 1794) (Teleostei: Ariidae)
Light and electron microscopy of Myxobolus sciades n. sp. (Myxozoa), a parasite of the gills of the Brazilian fish Sciades herzbergii (Block, 1794) (Teleostei: Ariidae)
A myxosporean parasite in the gill lamellae of the freshwater teleost
fish, Sciades herzbergii (Ariidae) (Block, 1794), from the Poti River
(Northeast of Brazil) was described by light and electron microscopy
studies. Polysporic histozoic cyst-like plasmodia containing several
life-cycle stages, including mature spores, were observed. The spores
were pyriform and uninucleate, measuring 9.15 ± 0.39 μm (n =
50) long, 4.36 ± 0.23 μm (n = 25) wide and 2.61 ± 0.31
μm (n = 25) thick. Elongated pyriform polar capsules (PC) were of
equal size (4.44 ± 0.41 μm long and 1.41 ± 0.42 μm
in diameter) and each contained a polar filament with 9-10 coils
obliquely arranged in relation to the axis of PC. The PC wall was
composed of two layers of different electron densities. Histological
analysis revealed the close contact of the cyst-like plasmodia with the
basal portion of the epithelial gill layer, which exhibited some
alterations in the capillary vessels. Based on the morphological and
ultrastructural differences, the similarity of the spore features to
those of the genus Myxobolus and the specificity of this host to
previously described species, we describe a new species named Myxobolus
sciades n. sp. in this study
Light and electron microscopy of Myxobolus sciades n. sp. (Myxozoa), a parasite of the gills of the Brazilian fish Sciades herzbergii (Block, 1794) (Teleostei: Ariidae)
A myxosporean parasite in the gill lamellae of the freshwater teleost fish, Sciades herzbergii (Ariidae) (Block, 1794), from the Poti River (Northeast of Brazil) was described by light and electron microscopy studies. Polysporic histozoic cyst-like plasmodia containing several life-cycle stages, including mature spores, were observed. The spores were pyriform and uninucleate, measuring 9.15 ± 0.39 μm (n = 50) long, 4.36 ± 0.23 μm (n = 25) wide and 2.61 ± 0.31 μm (n = 25) thick. Elongated pyriform polar capsules (PC) were of equal size (4.44 ± 0.41 μm long and 1.41 ± 0.42 μm in diameter) and each contained a polar filament with 9-10 coils obliquely arranged in relation to the axis of PC. The PC wall was composed of two layers of different electron densities. Histological analysis revealed the close contact of the cyst-like plasmodia with the basal portion of the epithelial gill layer, which exhibited some alterations in the capillary vessels. Based on the morphological and ultrastructural differences, the similarity of the spore features to those of the genus Myxobolus and the specificity of this host to previously described species, we describe a new species named Myxobolus sciades n. sp. in this study