Abstract: Flooding is an important strategy for weed control in paddy rice fields. However, terrestrial weeds had evolved mechanisms of tolerance to flooding, resulting in new ?snorkeling? ecotypes. The aim of this review is to discuss the mechanisms of flooding tolerance in cultivated and weedy rice at different plant stages and the putative utility of this trait for weed management. Knowledge about flooding tolerance is derived primarily from crop models, mainly rice.

Esquema de la presentación: Importancia de los sistemas ganaderos extensivos . Algunas tendencias del mercado mundial. Evolución del concepto de calidad. Los nuevos desafíos. Proyecto en desarrollo. Carnes diferenciadas ecológica y natural. Estudios del mercado europeo. Consideraciones finales.

Abstract Management of native weeds in natural grasslands is a challenging task. Often, recommendations are based on short?term studies of the response of weed cover and density to different control methods. However, perennial species well adapted to disturbances typically recover from commonly used control techniques. In this long?term study, we focused on a rosette native to the South American Campos : Eryngium horridum Malme (Apiaceae). This plant is strongly avoided by cattle due to its spiny leaves and tends to form dense patches, reducing the available grazing area.

Abstract: Active restoration of grassland ecosystems often requires the addition of species as seeds. However, knowledge of seed germination and initial performance of native species are still lacking in many regions, including the Brazilian grasslands. Regenerative traits (such as seed traits) have the potential to predict performance parameters related to the initial establishment of a species in a given environment.

ABSTRACT. The claim that organic agriculture produces higher levels of phytochemicals has been controversial for decades. Using strawberries as a model crop in field conditions, a preharvest leaf wounding stress was applied to study the production of phytochemicals in fruits. As a result phenolic compounds (PCs) and total soluble sugars increased significantly, where specific phenylpropanoids showed increment up to 137% and several genes related to PCs biosynthesis and sugar transport were overexpressed.

En los últimos 20 años los péptidos antimicrobianos (PAM) han despertado interés en este tema por presentar especificidad de organismos blanco y baja presión de selección de cepas multirresistentes. Los objetivos de este trabajo se centraron en la búsqueda, purificación y producción de nuevos PAM con la capacidad de controlar fitopatógenos de interés agronómico.