Microbial Community Dynamics and Response to Plant Growth-Promoting Microorganisms in the Rhizosphere of Four Common Food Crops Cultivated in Hydroponics.

Plant growth promoting microorganisms (PGPMs) of the plant root zone microbiome have received limited attention in hydroponic cultivation systems. In the framework of a project aimed at the development of a biological life support system for manned missions in space, we investigated the effects of PGPMs on four common food crops (durum and bread wheat, potato and soybean) cultivated in recirculating hydroponic systems for a whole life cycle. Each crop was inoculated with a commercial PGPM mixture and the composition of the microbial communities associated with their root rhizosphere, rhizoplane/endosphere and with the recirculating nutrient solution was characterised through 16S- and ITS-targeted Illumina MiSeq sequencing. PGPM addition was shown to induce changes in the composition of these communities, though these changes varied both between crops and over time. Microbial communities of PGPM-treated plants were shown to be more stable over time. Though additional development is required, this study highlights the potential benefits that PGPMs may confer to plants grown in hydroponic systems, particularly when cultivated in extreme environments such as space.

[Analysis of clinical safety in the units of Allergy of the Valencian Community]. / Análisis de la seguridad clínica en las unidades de Alergología de la Comunidad Valenciana.

The introduction of new diagnostic and therapeutic procedures involving allergen exposure may increase the risk of allergic reactions. We designed and distributed an anonymous questionnaire among the allergy units of the Valencian Community in order to collect information on measures to ensure clinical safety. Twelve hospital outpatient clinics and 8 ambulatory care centres reported similar patterns of activities, including the use of critical care units, emergency rooms or day hospitals for higher risk techniques. The provision of security-related instruments is broader in hospital outpatient clinics and included: oxygen (91.7%), pulse oximeter (75.0%) or vital signs monitor (8.3%), resuscitation material (91.7%) and defibrillator (83.3%). The response time for emergencies is set in 50% of clinics. The resuscitation material is systematically reviewed and informed consent signed. Security is more limited in ambulatory care centres. It is necessary to set down the conditions for clinical safety in allergology. Key words. Allergy. Ambulatory care. Clinical safety. Health services. Hospital outpatient clinic.