Influence of physico-chemical parameters of the aquatic medium on germination of Eichhornia crassipes seeds.

The germination of seeds of Eichhornia crassipes in locations distant from the foci of infestation may be a means of dispersal of this invasive plant. Nonetheless, no modern studies have examined the influence of single components on germination, although the influence of temperature, oxygen and redox potential was examined in earlier studies. The effects of pH, conductivity, nitrate, phosphate, potassium, calcium, iron and boron on germination of E. crassipes were determined in seed germination tests. The results showed that external input of nutrients influences germination, since neither pH nor conductivity alone had any effect, but there was a significant increase in germination in growth media containing phosphorus at 3.95 mg·l(-1) (P/L; 95.5%) and boron at 10 mg·l(-1) (B/L; 97.5%); at higher concentrations, the latter was toxic. These findings contribute to knowledge of factors controlling the germination of E. crassipes seeds. Consequently, E. crassipes seeds would find very good conditions for germination in water classified as hypereutrophic, which may play a decisive role in expansion of this plant.

[Veno-occlusive liver disease due to intake of Senecio vulgaris tea]. / Enfermedad venooclusiva hepática por ingestión de infusiones de Senecio vulgaris.

Veno-occlusive liver disease (VOLD) is a cause of portal hypertension by non thrombotic obstruction of hepatic venous drainage attributed to multiple etiologies (toxic, irradiation, antineoplastic, conditioning for bone marrow transplantation). One case of VOLD in a senile patient due to continuous two year consumption of Senecio vulgaris tea is reported. This compound, which has a high pyrrolizidine alkaloid content induced a subacute course of portal hypertension and death. The clinicopathologic features of VOLD and the etiopathogenesis in relation to the pyrrolizidine alkaloids present in Senecio vulgaris are discussed. The need for considering the history of medicinal plant ingestion in patients under portal hypertension studies are strongly recommended as is the advice regarding the possible dangers involved in the inappropriate use of remedies provided by herbalists.