Aromáticas y medicinales en Paravachasca: promoviendo el aprovechamiento sustentable

In Córdoba province, the use and commercialization of native aromatic and medicinal plants (AMP) are widespread practices adopted by the population. This context defines the need for the development of adequate technologies and its transfer to the environment in order to revalue and conserve the resource; the proposed objectives were to promote the use, production and sustainable use of native AMP in Valle de Paravachasca and to train social actors in management practices. In order to address sustainable practices in the use of AMP and their cultivation, the training and learning of students, teachers, producers and policy makers was carried out through journeys, practical workshops in fields and exchange of knowledge. The development of new knowledge was achieved through active participation in the different stages carried out. It is worth highlighting that students and teachers showed great interest in the activities and spaces for intervention on the subject. The participation of family groups in relation to new concerns and the return of practices and knowledge was visualized, allowing progress towards new objectives in pursuit of regional development. The interrelation and participation made it possible to detect new problems for future challenges in university research and outreach.En la provincia de Córdoba el uso y comercialización de plantas aromáticas y medicinales (PAM) nativas son prácticas difundidas y arraigadas en la población. Sin embargo, las prácticas de colecta no se realizan en forma sustentable, generando la degradación de los recursos y consecuentemente la pérdida de ingresos familiares. Este contexto define la necesidad del desarrollo de tecnologías adecuadas y su transferencia al medio para revalorizar y conservar el recurso. Los objetivos propuestos fueron promover el aprovechamiento, producción y uso sustentable de PAM nativas en el Valle de Paravachasca y capacitar a los actores sociales en las prácticas de manejo. Para abordar las prácticas sustentables en el aprovechamiento de las PAM y su cultivo se consideró la capacitación y aprendizaje de alumnos, docentes, productores y decisores políticos a través de jornadas, talleres de prácticas a campo e intercambio de saberes. La incorporación de nuevos conocimientos se logró mediante la participación activa en las instancias desarrolladas. Se destacó el gran interés de alumnos y docentes en las actividades y espacios de acción sobre la temática. Se visualizó la participación de los grupos familiares en nuevas inquietudes y el retorno de prácticas y conocimientos, permitiendo avanzar hacia nuevos objetivos en pos de un desarrollo regional. La interrelación y participación permitieron detectar nuevas problemáticas para futuros desafíos en la investigación y extensión universitaria

Jatropha curcasand Ricinus communisdisplay contrasting photosynthetic mechanisms in response to environmental conditions

Higher plants display different adaptive strategies in photosynthesis to cope with abiotic stress. In this study, photosynthetic mechanisms and water relationships displayed byJatropha curcasL. (physic nuts) andRicinus communisL. (castor bean), in response to variations in environmental conditions, were assessed.R. communis showed higher CO2 assimilation, stomatal and mesophyll conductance thanJ. curcas as light intensity and intercellular CO2 pressure increased. On the other hand,R. communis was less effective in stomatal control in response to adverse environmental factors such as high temperature, water deficit and vapor pressure deficit, indicating lower water use efficiency. Conversely,J. curcas exhibited higher photosynthetic efficiency (gas exchange and photochemistry) and water use efficiency under these adverse environmental conditions.R. communisdisplayed higher potential photosynthesis, but exhibited a lowerin vivo Rubisco carboxylation rate (Vcmax) and maximum electron transport rate (Jmax). During the course of a typical day, in a semiarid environment, with high irradiation, high temperature and high vapor pressure deficit, but exposed to well-watered conditions, the two studied species presented similar photosynthesis. Losing potential photosynthesis, but maintaining favorable water status and increasing non-photochemical quenching to avoid photoinhibition, are important acclimation mechanisms developed byJ. curcas to cope with dry and hot conditions. We suggest thatJ. curcas is more tolerant to hot and dry environments thanR. communis but the latter species displays higher photosynthetic efficiency under well-watered and non-stressful conditions

Rede geodésica para o monitoramento costeiro do litoral setentrional do estado do Rio Grande do Norte

Este trabalho apresenta os procedimentos técnicos envolvidos na implantação da Rede GPS do Litoral Setentrional do Rio Grande do Norte (RGLS), onde o objetivo é fornecer subsídios fundamentais aos levantamentos geodésicos destinados ao monitoramento de áreas costeiras, submetidas à intensa dinâmica e de grande importância socioeconômica e ecológica para o Estado do Rio Grande do Norte. A metodologia permitiu a determinação das coordenadas geodésicas e altitudes ortométricas das estações com precisão decimétrica em relação ao Sistema Geodésico Brasileiro (SGB), a partir do método de posicionamento relativo e da altimetria por GPS. Ainda, foi possível o estudo de aspectos geodésicos envolvidos na altimetria por GPS, tais como avaliação da situação física e da densidade das Referências de Nível (RRNN) disponíveis, avaliação absoluta e relativa do modelo geoidal, proposição de metodologia para a altimetria por GPS de precisão e desenvolvimento de software para essa finalidade, que contribuíram para o conhecimento geodésico na área de estudo