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Galicia-Campos E, García-Villaraco Velasco A, Montero-Palmero MB, Gutiérrez-Mañero FJ, Ramos-Solano B. Modulation of Photosynthesis and ROS Scavenging Response by Beneficial Bacteria in Olea europaea Plantlets under Salt Stress Conditions. Plants (Basel) 2022; 11:2748. [PMID: 36297772 PMCID: PMC9611751 DOI: 10.3390/plants11202748] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 09/28/2022] [Accepted: 10/07/2022] [Indexed: 06/16/2023]
Abstract
Climate change consequences for agriculture involve an increase of saline soils which results in lower crop yields due to increased oxidative stress in plants. The present study reports the use of Plant Growth Promoting Bacteria (PGPB) as a tool to modulate plant innate mechanisms of adaptation to water stress (salinity and drought) in one year-old olive plantlets var. Arbosana and Arbequina. Integration of external changes in plants involve changes in Reactive Oxygen Species (ROS) that behave as signals to trigger plant adaptative mechanisms; however, they become toxic in high concentrations. For this reason, plants are endowed with antioxidant systems to keep ROS under control. So, the working hypothesis is that specific beneficial strains will induce a systemic response able to modulate oxidative stress and improve plant adaptation to water stress. Ten strains were assayed, evaluating changes in photosynthesis, pigments, ROS scavenging enzymes and antioxidant molecules, osmolytes and malondialdehyde, as oxidative stress marker. Photosynthesis and photosynthetic pigments were the most affected variables. Despite the specific response of each variety, the favorite targets of PGPBs to improve plant fitness were photosynthetic pigments and the antioxidant pools of glutathione and ascorbate. Our results show the potential of PGPBs to improve plant fitness modulating oxidative stress.
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Martínez-Blancas A, Beláustegui IX, Martorell C. Species alliances and hidden niche dimensions drive species clustering along a hydric gradient in a semiarid grassland. Ecol Lett 2022; 25:2651-2662. [PMID: 36217951 DOI: 10.1111/ele.14122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 09/12/2022] [Accepted: 09/13/2022] [Indexed: 11/28/2022]
Abstract
Clustering of species with similar niches or traits occurs in communities, but the mechanisms behind this pattern are still unclear. In the emergent neutrality model, species with similar niches and competitive ability self-organise into clusters. In the hidden-niche model, unaccounted-for niche differences stabilise coexistence within clusters. Finally, clustering may occur through alliances of species that facilitate each other. We tested these hypotheses using population-growth models that consider interspecific interactions parameterised for 35 species using field data. We simulated the expected community dynamics under different species-interaction scenarios. Interspecific competition was weaker within rather than between clusters, suggesting that differences in unmeasured niche axes stabilise coexistence within clusters. Direct facilitation did not drive clustering. In contrast, indirect facilitation seemingly promoted species alliances in clusters whose members suppressed common competitors in other clusters. Such alliances have been overlooked in the literature on clustering, but may arise easily when within cluster competition is weak.
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Affiliation(s)
- Alejandra Martínez-Blancas
- Facultad de Ciencias, Departamento de Ecología y Recursos Naturales, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, Mexico.,Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, Mexico
| | - Ian Xul Beláustegui
- Facultad de Ciencias, Departamento de Ecología y Recursos Naturales, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, Mexico
| | - Carlos Martorell
- Facultad de Ciencias, Departamento de Ecología y Recursos Naturales, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, Mexico
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Hamrouni R, Dupuy N, Karachurina A, Mitropoulou G, Kourkoutas Y, Molinet J, Maiga Y, Roussos S. Biotechnological potential of Zymotis-2 bioreactor for the cultivation of filamentous fungi. Biotechnol J 2021; 17:e2100288. [PMID: 34599625 DOI: 10.1002/biot.202100288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 09/24/2021] [Accepted: 09/27/2021] [Indexed: 11/09/2022]
Abstract
BACKGROUND/AIM A new prototype of Solid-State Fermentation Bioreactor, namely "Zymotis-2 ",was developed to produce fungal spores. MAIN METHODS AND MAJOR RESULTS A fermentation process for fungal spores, and hydrolase enzymes (endo and exoglucanases, amylases) production by Trichoderma asperellum DWG3, Aspergillus niger G131 and Beauveria bassiana was scaled-up from flasks and glass Raimbault column packed with 20 g of solid substrates (dry weight) to 5 kg of solid substrate by using the new Zymotis-2 bioreactor. Fungi strains growth using a mix of vine shoots, wheat bran, and olive pomace was tested under similar experimental conditions in Zymotis-2 bioreactor, column bioreactor and flasks in a parallel fermentation system. Overall, significant spore production on Zymotis-2 bioreactor was obtained, achieving 22.01 ± 0.01×109 spores/g DM 16.30 ± 0.07 × 109 spores/g DM, and 3.30 ± 0.07 × 109 spores/g DM for B. bassiana, T. asperellum DWG3, and A. niger G131, respectively. Forced aeration increased the endoglucanases, exoglucanases and amylases activities for T. asperellum DWG3 but B. bassiana and A. niger G131 were affected negatively by the aerated process, showing the lowest enzyme activities. CONCLUSIONS AND IMPLICATIONS In conclusion, a high yield of spores was obtained at 137 h of cultivation time, confirming the validity of the new Zymotis-2 bioreactor to produce virulent spores at low cost by T. asperellum, B. bassiana and A. niger G131.
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Affiliation(s)
- Rayhane Hamrouni
- Aix Marseille Univ, Avignon Univ, CNRS, IRD, IMBE, Marseille, France.,Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020 Ariana, Tunisia
| | - Nathalie Dupuy
- Aix Marseille Univ, Avignon Univ, CNRS, IRD, IMBE, Marseille, France
| | - Alina Karachurina
- Aix Marseille Univ, Avignon Univ, CNRS, IRD, IMBE, Marseille, France
| | - Gregoria Mitropoulou
- Laboratory of Applied Microbiology and Biotechnology, Department of Molecular Biology and Genetics, Democritus University of Thrace, University Campus, Alexandroupolis, GR 68100, Greece
| | - Yiannis Kourkoutas
- Laboratory of Applied Microbiology and Biotechnology, Department of Molecular Biology and Genetics, Democritus University of Thrace, University Campus, Alexandroupolis, GR 68100, Greece
| | - Josiane Molinet
- Aix Marseille Univ, Avignon Univ, CNRS, IRD, IMBE, Marseille, France
| | - Ynoussa Maiga
- Laboratoire de Microbiologie et de Biotechnologie Microbienne, Université Joseph Ki-Zerbo, Ouagadougou, Burkina Faso
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Caicedo-Lopez LH, Contreras-Medina LM, Guevara-Gonzalez RG, Perez-Matzumoto AE, Ruiz-Rueda A. Effects of hydric stress on vibrational frequency patterns of Capsicum annuum plants. Plant Signal Behav 2020; 15:1770489. [PMID: 32490712 PMCID: PMC8570743 DOI: 10.1080/15592324.2020.1770489] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 05/06/2020] [Accepted: 05/08/2020] [Indexed: 05/20/2023]
Abstract
Plants that experience a lack of sufficient irrigation undergo hydric stress, which causes the modification of their mechanical properties. These changes include a complex network of chemical and physical signals that interact between plant-plant and plant-environment systems in a mechanism that is still not well understood, and that differs among species. This mechanical response implies different levels of vibration when the plant experiences structural modifications from self-hydraulic adjustments of flux exchange at specific frequencies, with these carrying behavioral information. To measure these signals, highly sensitive instrumentation that allows the decoding of displacement velocity and displacement of plants, which is possible through calibrated equipment such as 3D scanning laser vibrometers, is necessary. Laser vibrometry technology allows for noninvasive measurements in real-time. Physiological changes could reasonably affect the biomechanical condition of plants in terms of the frequency (hertz) and intensity of the plant's vibration. In this research, it is proposed that the frequency changes of a plant's vibration are related to the plant's hydric condition and that these frequency vibrations have the ecological potential to communicate water changes and levels of hydric stress. The peak of the velocity of plant displacements was found to vary from 0.079 to 1.74 mm/s, and natural frequencies (hertz) range is between 1.8 and 2.6 Hz for plants with low hydric stress (LHS), between 1.3 and 1.6 Hz for plants with medium hydric stress (MHS), and between 6.7 and 7.8 Hz for plants with high hydric stress. These values could act as preliminary references for water management using noninvasive techniques and, knowledge of the range of natural frequencies of hydric stress risk in chili pepper crops can be applied in precision agriculture practices.
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Affiliation(s)
- Laura Helena Caicedo-Lopez
- Group of Basic and Applied Bioengineering, Faculty of Engineering, Autonomous University of Queretaro, El Marques, Mexico
| | - Luis Miguel Contreras-Medina
- Group of Basic and Applied Bioengineering, Faculty of Engineering, Autonomous University of Queretaro, El Marques, Mexico
- CONTACT Luis Miguel Contreras-Medina Group of Basic and Applied Bioengineering, Faculty of Engineering, Autonomous University of Queretaro, Campus Amazcala, Campus Amazcala. Carr. Chichimequillas-Amazcala Km 1 S/N, El Marques76265, Mexico
| | - Ramon Gerardo Guevara-Gonzalez
- Group of Basic and Applied Bioengineering, Faculty of Engineering, Autonomous University of Queretaro, El Marques, Mexico
| | | | - Arturo Ruiz-Rueda
- Physical Metrology, National Metrology Center (CENAM) Km 4.5 Carretera a Los Cues C.P, El Marques, México
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Le May C, Montarry J, Morris CE, Frenkel O, Ravigné V. Editorial: Plant Pathogen Life-History Traits and Adaptation to Environmental Constraints. Front Plant Sci 2020; 10:1730. [PMID: 32038694 PMCID: PMC6993043 DOI: 10.3389/fpls.2019.01730] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 12/09/2019] [Indexed: 05/31/2023]
Affiliation(s)
- Christophe Le May
- IGEPP, INRA, Agrocampus-Ouest, Université de Rennes 1, Le Rheu, France
| | - Josselin Montarry
- IGEPP, INRA, Agrocampus-Ouest, Université de Rennes 1, Le Rheu, France
| | | | - Omer Frenkel
- Agricultural Research Organization, Volcani Center, Rishon LeZion, Israel
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