Genes of the RAV family control heading date and carpel development in rice

In plants, correct formation of reproductive organs is critical for successful seedset and perpetuation of the species. Plants have evolved different molecular mechanisms to coordinate flower and seed development at the proper time of the year. Among the plant-specific RELATED TO ABI3 AND VP1 (RAV) family of transcription factors, only TEMPRANILLO1 (TEM1) and TEM2 have been shown to affect reproductive development in Arabidopsis (Arabidopsis thaliana). They negatively regulate the floral transition through direct repression of FLOWERING LOCUS T and GIBBERELLIN 3-OXIDASE1/2, encoding major components of the florigen. Here we identify RAV genes from rice (Oryza sativa), and unravel their regulatory roles in key steps of reproductive development. Our data strongly suggest that, like TEMs, OsRAV9/OsTEM1 has a conserved function as a repressor of photoperiodic flowering upstream of the floral activators OsMADS14 and Hd3a, through a mechanism reminiscent of that one underlying floral transition in temperate cereals. Furthermore, OsRAV11 and OsRAV12 may have acquired a new function in the differentiation of the carpel and the control of seed size, acting downstream of floral homeotic factors. Alternatively, this function may have been lost in Arabidopsis. Our data reveal conservation of RAV gene function in the regulation of flowering time in monocotyledonous and dicotyledonous plants, but also unveil roles in the development of rice gynoecium

TEMPRANILLO is a direct repressor of the microRNA miR172

In the age-dependent pathway, microRNA 156 (miR156) is essential for the correct timing of developmental transitions. miR156 negatively regulates several SPL genes, which promote the juvenile-to-adult and floral transitions in part through upregulation of miR172. The transcriptional repressors TEMPRANILLO1 (TEM1) and TEM2 delay flowering in Arabidopsis thaliana at least through direct repression of FLOWERING LOCUS T (FT) and gibberellin biosynthetic genes, and have also been reported to participate in the length of the juvenile phase. Levels of TEM mRNA and miR156 decrease gradually, allowing progression through developmental phases. Given these similarities, we hypothesized that TEMs and the miR156/SPL/miR172 module could act through a common genetic pathway. We analyzed the effect of TEMs on levels of miR156, SPL and miR172, tested binding of TEMs to these genes using chromatin immunoprecipitation and analyzed the genetic interaction between TEMs and miR172. We found that TEMs played a stronger role in the floral transition than in the juvenile-to-adult transition. TEM1 repressed MIR172A, MIR172B and MIR172C expressions and bound in vivo to at least MIR172C sequences. Genetic analyses indicated that TEMs affect the regulation of developmental timing through miR172

Changes in nutritional quality-related traits of quinoa seeds under different storage conditions

Within the context of climate change and its impact on global food security, seed storage has become key, as it ensures long-term food and next-season seed preservation. Aiming at evaluating quality-related changes in quinoa seeds over storage time, different storage temperatures (–20, 4, 12, 25, and 37°C) and humidity conditions (use of silica gel or not) were studied and different seed nutritional parameters were evaluated at different points during a year of storage. Also, to determine if these variations could be conditioned by the genotype used, two quinoa cultivars were compared. The results proved that quinoa seed quality is highly dependent on the storage temperature but is not consistently affected by the use of silica gel if the seed moisture content (SMC) is kept between 5 and 12%. Furthermore, quality can be maintained and even improved by keeping SMC lower than 12% and storage temperatures low (4°C). Under these conditions (at 4°C in hermetic packaging with or without silica gel), and after 12 months of storage, there was an increase in amino acids like isoleucine, serine, arginine, glycine, and glutamic acid and in seed viability and germination. On the contrary, quinoa seeds stored at 37°C showed an accumulation of reactive oxygen species (ROS) which was related to a lower antioxidant capacity and a reduction in the contents of essential amino acids like isoleucine, lysine, histidine, and threonine, resulting in a delayed and reduced germination capacity, and, therefore, lower seed quality. Besides, quality-related differences appeared between cultivars highlighting differences linked to the genotype. Overall, this work demonstrates that optimal storage temperatures and SMC can preserve or even improve quinoa seed nutritional quality, which in turn can impact food safety and agricultureThis work was supported by the Ministerio de Ciencia e Innovación (MICINN, Spain) (PID2019-105748RA-I00), the Comunidad de Madrid-Universidad Autónoma de Madrid (SI1/PJI/2019-00124), the CYTED (ValSe-Food 119RT0567), the FPI-UAM Fellowship Programme 2019 (to SG-R), the Ayundante de Investigación CM Programme (to IM-G), and the Ramón y Cajal Programme 2019 (to M

The shape of D-glucosamine

The bioactive amino monosaccharide D-glucosamine has been generated in gas phase via laser ablation of D-glucosamine hydrochloride. Three cyclic α- 4C1 pyranose forms have been identified using Fourier transform microwave techniques. Stereoelectronic hyperconjugative forces – essentially linked with the anomeric or gauche effect – and cooperative OH…O, OH…N and NH…O chains, extended along the entire molecule, are found to be the main factors driving the conformational behavior. The orientation of the NH2 group within each conformer has been determined by the values of the nuclear quadrupole constants. The results have been compared with those recently obtained for the archetypical D-glucose

Reduced sTWEAK and Increased sCD163 Levels in HIVInfected Patients: Modulation by Antiretroviral Treatment, HIV Replication and HCV Co-Infection

Background: Patients infected with the human immunodeficiency virus (HIV) have an increased risk of cardiovascular disease due to increased inflammation and persistent immune activation. CD163 is a macrophage scavenger receptor that is involved in monocyte-macrophage activation in HIV-infected patients. CD163 interacts with TWEAK, a member of the TNF superfamily. Circulating levels of sTWEAK and sCD163 have been previously associated with cardiovascular disease, but no previous studies have fully analyzed their association with HIV. Objective: The aim of this study was to analyze circulating levels of sTWEAK and sCD163 as well as other known markers of inflammation (hsCRP, IL-6 and sTNFRII) and endothelial dysfunction (sVCAM-1 and ADMA) in 26 patients with HIV before and after 48 weeks of antiretroviral treatment (ART) and 23 healthy subjects. Results: Patients with HIV had reduced sTWEAK levels and increased sCD163, sVCAM-1, ADMA, hsCRP, IL-6 and sTNFRII plasma concentrations, as well as increased sCD163/sTWEAK ratio, compared with healthy subjects. Antiretroviral treatment significantly reduced the concentrations of sCD163, sVCAM-1, hsCRP and sTNFRII, although they remained elevated when compared with healthy subjects. Antiretroviral treatment had no effect on the concentrations of ADMA and sTWEAK, biomarkers associated with endothelial function. The use of protease inhibitors as part of antiretroviral therapy and the presence of HCV-HIV co-infection and/or active HIV replication attenuated the ART-mediated decrease in sCD163 plasma concentrations. Conclusion: HIV-infected patients showed a proatherogenic profile characterized by increased inflammatory, immuneactivation and endothelial-dysfunction biomarkers that partially improved after ART. HCV-HIV co-infection and/or active HIV replication enhanced immune activation despite ART.Redes Temáticas de Investigación en SIDA (ISCIII RETIC RD12/0017/0029 and RD12/0017/0037)Junta de Andalucía, Incentivos a proyectos de investigación de excelencia (CTS-6313, to Manolo Leal)Consejería de Salud (PI-0278)FIS PI10/00234 to LMBC and Programa Miguel Servet: CP10/00479 and PI13/00802 to JAMFundacion Lilly, FRIAT and ISCIII fund PI10/0007

From local monitoring to a broad-scale viability assessment: a case study for the Bonelli’s Eagle in western Europe

Population viability analysis (PVA) has become a basic tool of current conservation practice. However, if not accounted for properly, the uncertainties inherent to PVA predictions can decrease the reliability of this type of analysis. In the present study, we performed a PVA of the whole western European population (France, Portugal, and Spain) of the endangered Bonelli's Eagle (Aquila fasciata), in which we thoroughly explored the consequences of uncertainty in population processes and parameters on PVA predictions. First, we estimated key vital rates (survival, fertility, recruitment, and dispersal rates) using monitoring, ringing, and bibliographic data from the period 1990-2009 from 12 populations found throughout the studied geographic range. Second, we evaluated the uncertainty about model structure (i.e., the assumed processes that govern individual fates and population dynamics) by comparing the observed growth rates of the studied populations with model predictions for the same period. Third, using the model structures suggested in the previous step, we assessed the viability of both the local populations and the overall population. Finally, we analyzed the effects of model and parameter uncertainty on PVA predictions. Our results strongly support the idea that all local populations in western Europe belong to a single, spatially structured population operating as a source-sink system, whereby the populations in the south of the Iberian Peninsula act as sources and, thanks to dispersal, sustain all other local populations, which would otherwise decline. Predictions regarding population dynamics varied considerably, and models assuming more constrained dispersal predicted more pessimistic population trends than models assuming greater dispersal. Model predictions accounting for parameter uncertainty revealed a marked increase in the risk of population declines over the next 50 years. Sensitivity analyses indicated that adult and pre-adult survival are the chief vital rates regulating these populations, and thus, the conservation efforts aimed at improving these survival rates should be strengthened in order to guarantee the long-term viability of the European populations of this endangered species. Overall, the study provides a framework for the implementation of multi-site PVAs and highlights the importance of dispersal processes in shaping the population dynamics of long-lived birds distributed across heterogeneous landscapes.Ministerio de Educación y Ciencia CGL200-64805/BOS CGL2010-17056 SAB-2006-0014/Roge

Current and potential uses of Amaranth (Amaranthus spp.)

The genus Amaranthus comprises about 70 species, of which 40 are native to the American continent and the rest of Australia, Africa, Asia and Europe. A. caudatus L., A. hypochondriacus L. and A. cruentus L. are the species that in recent years have created a strong interest as agricultural crops in many regions of the world due to the high nutritional value of their seeds and leaves. Amaranth, considered one of the most nutritious pseudocereals, mainly used for human consumption in several ways; highlighting among them the production of solid sweets with their seeds or drinks based on flour, as vegetables, as fodder for livestock and for obtaining oils and cosmetic products. In spite of being considered by FAO as the crop with the greatest potential for technical development for the regions and communities of America due to the nutritional characteristics of the whole plant as well as the attribute of its excellent capacity to resist soils and dry climates, It presents a very slow production curve, mainly at low yields, hence, the objective of this review is to perform an analysis of the multiple forms, in addition to consumption, in which amaranth can be used, and with this, in some way, motivate farmers to continue cultivating it

Indicadores de prescripción racional de medicamentos: factibilidad de aplicación en instituciones de las Américas

Objetivo. Evaluar la factibilidad de monitorear la calidad de la utilización de medicamentos en instituciones sanitarias de países de la Región de las Américas mediante indicadores de prescripción racional. Métodos. Se realizó un estudio cuantitativo de utilización de medicamentos durante el período 2016-2018. Se desarrollaron y seleccionaron indicadores de prescripción racional de acuerdo a referencias internacionales y a la mejor evidencia disponible para: 1) antiinflamatorios: porcentaje de prescripción de ibuprofeno y/o naproxeno sobre prescripción total de antinflamatorios no esteroideos; 2) antidiabéticos orales: metformina como porcentaje de todos los antidiabéticos prescritos, metformina y/o sulfonilureas como porcentaje de todos los antidiabéticos prescritos; 3) insulinas: insulina cristalina y NPH como porcentaje del total de insulinas prescritas y 4) medicamentos antihipertensivos: porcentaje de inhibidores de la enzima convertidora de la angiotensina (IECA), antagonistas de los receptores de la angiotensina II (ARA-II) y diuréticos tiazídicos sobre el total de antihipertensivos prescritos. Se empleó la dosis diaria definida (DDD) por 1 000 habitantes y día (DHD) como medida del consumo por institución. Resultados. La prescripción de metformina con relación a todos los antidiabéticos fue menor al valor del indicador de referencia (27,9%-67,6% vs. 88%), mientras que la prescripción de metformina y/o una sulfonilurea fue comparable con dicho valor (80,9%-97,5% vs. 88%). Los valores de insulina NPH, cristalina y NPH/ cristalina con relación a las insulinas prescritas fueron variables frente al valor del indicador de referencia (37,1%-100% vs. 75%). La prescripción de ibuprofeno y naproxeno estuvo por debajo del valor del indicador (20%-50% vs. 80%). El porcentaje de IECA, ARA-II y tiazidas respecto a todos los antihipertensivos osciló entre 65,2%-77,2% vs 65%, acorde al valor del indicador propuesto. Conclusiones. Se demostró la factibilidad de aplicar los indicadores de prescripción racional seleccionados y construidos, que proporcionan información útil para analizar la calidad de la prescripción en las instituciones sanitarias de países de la Región y representan una herramienta útil para su monitoreo periódico.Facultad de Ciencias Médica