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Recent Submissions

Evaluating Guayule (Parthenium argentatum A. Gray) Germplasm Grown in Spain: Rubber and Resin along Three Production Cycles
(MDPI, 2024) Jara García, Francisco Miguel; García Martínez, María de las Mercedes; López Córcoles, Horacio; Carrión Jiménez, María Engracia; Zalacain Aramburu, Amaya; Carmona Delgado, Manuel
Rubber and resin are potentially important products of guayule (Parthenium argentatum A. Gray) that can assure the profitability of this crop as an agricultural alternative for the semi-arid areas of central and eastern Spain. This study analyzes, for the first time, the changes in rubber and resin production across 27 guayule accessions (traditional and modern) and along three cycles under the agroclimatic conditions of Castilla-La Mancha, simulating industrial management with a biannual harvest. The rubber content (% of dry mass) increased from 4.2% in one-year-old plants to 6.6% in twoyear-old plants, but decreased after harvesting. Contrastingly, the rubber yield doubled in contiguous sampling, reaching a mean of 303.6 kg ha-1, with a maximum yield of 341.2 kg ha-1 after the first harvest. Three patterns of rubber production were established based on the production periods. A similar analysis was performed for resin production, which was heterogeneous across accessions belonging to the same rubber groups. In this case, three independent groups were established to classify the resin accumulation profiles following the same criteria of production periods. Here, we demonstrate that biannual harvesting has the potential to enhance rubber accumulation in summer, although more research is needed for its adaption to current harvesting techniques in this area
Profile and accumulation of essential oils from guayule (Parthenium argentatum A. Gray) accessions and hybrids
(Elsevier, 2024) García Martínez, María de las Mercedes; Saúl Esteban, Luis; Mediavilla, Irene; Carrión Jiménez, María Engracia; González Navarro, Emilio José; Carmona Delgado, Manuel; Zalacain Aramburu, Amaya
For guayule (Parthenium argentatum A. Gray) to become a viable market option, it will be necessary to exploit not only the rubber and resin components, but also other high-value plant products such as essential oils (EOs). A detailed EO profiling study was conducted on 16 guayule accessions for first time, which revealed significant differences in EO yield and profile among them. Accession AZ-2 had the highest yield up to 0.9% (dry weight), followed by CFS18–2005, CAL-7, and CFS17–2005. These yields were comparable with those of aromatic plants used in the industry, providing valuable economic insights. The volatile EO composition of the accessions was unique and discriminating. Volatile sesquiterpenes were the most abundant compounds at the beginning of the flowering stage (S1-June sampling), while monoterpenes became more abundant as flowering progressed (S2-July and S3-August sampling). At S1, it was possible to distinguish between hybrid (mariola and non-mariola) and other accessions by the EO profile. By the end of the summer season (S3, August 2023), the EO volatile profile could more easily distinguish the accessions according to their genetic origin, enabling the separation of pure guayule accessions. The extraction of guayule EOs on an industrial scale (1.2 Mg fresh biomass) demonstrated high yield and consistency in terms of volatile profile, underscoring its potential for commercial exploitation.
Efecto de un programa de iniciación a la natación basado en juegos motores acuáticos sobre la autoestima corporal y socio afectiva en niñas y niños de 5 y 6 años de edad
(Universidad de Murcia, Servicio de Publicaciones, 2023) Cano Noguera, Francisco; Simón Piqueras, Juan Ángel; Zamorano García, David; Gil Madrona, Pedro
This study sought to examine the success of the application of two introductory swimming programmes in enhancing the body and socio-affective self-esteem of 5-and 6-year-olds, and to determine which of these programmes was more effective in this improvement. Both programmes were administered over three months and were designed under the stageapproach of the Royal Spanish Swimming Federation. The first was implemented in the control group (31 girls and 27 boys), and the second in the experimental group (29 girls and 23 boys). The experimental group included the application of aquatic games designed to promote cooperative play and children’s knowledge of their own bodies. The results showed significant improvements in both types of self-esteem in the experimental group, while only body self-esteem improved in the control group. In the between-group comparison, the experimental group showed significantly more robust results in both types of self-esteem. No gender differences were found. We conclude that the use of motor games oriented towards collaborative games and knowledge of one's own body aremore effective in improving both types of self-esteem. Thus, their use is recommended in introductory swimming classes.Key wordsInitiation to the aquatic environment; Traditional Games, Early childhoodswimming, Collaborative games.Fecha de recepción:4 de mayo de 2023Fecha de aceptación:13 de julio de 2023
A review on low-cost microscopes for Open Science
(Wiley, 2022) Salido Tercero, Jesús; Bueno García, María Gloria; Ruiz-Santaquiteria Alegre, Jesús; Cristobal, Gabriel
This article presents a review after an exhaustive search that yielded 23 works carried out in the last decade for the availability of optical microscopes with open hardware as a low-cost alternative to commercial systems.