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Yang D, Zuo M, Chen Y, Liu Y, He Y, Wang H, Liu X, Xu J, Zhao M, Shen Y, Liu Y, Tianpeng G. Effects of the promoting bacterium on growth of plant under cadmium stress. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2024; 26:339-348. [PMID: 37553855 DOI: 10.1080/15226514.2023.2241925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
Cadmium (Cd) pollution is a huge threat to ecosystem health. In the manuscript, pot experiments were conducted to investigate the changes in plant biomass and antioxidant indicators under different cadmium pollution levels (0, 25, 50, and 100 mg/kg) of inoculation of plant growth-promoting bacteria ZG7 on sugar beet. The results showed that the accumulation of excess Cd in sugar beet exhibited different symptoms, including reduced biomass (p < 0.05). Compared with the group treated with uninoculated strain ZG7, inoculation of strain ZG7 significantly reduced the toxicity of sugar beet to Cd and enhanced its antioxidant capacity, with no significant differences in root biomass and increases in leaf biomass of 15.71, 5.84, and 74.12 under different Cd concentration treatments (25, 50, and 100 mg/kg), respectively. The root enrichment of Cd was reduced by 49.13, 47.26, and 21.50%, respectively (p < 0.05). The leaf fraction was reduced by 59.35, 29.86, and 30.99%, respectively (p < 0.05). In addition, the enzymatic activities of sucrase, urease, catalase, and neutral phosphatase were significantly enhanced in the soil (p < 0.05). This study helps us to further investigate the mechanism of cadmium toxicity reduction by inoculated microorganisms and provides a theoretical reference for growing plants in cadmium-contaminated agricultural fields.
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Affiliation(s)
- Deng Yang
- School of Biology and Pharmaceutical Engineering, Lanzhou Jiaotong University, Lanzhou, China
| | - Mingbo Zuo
- School of Biology and Environmental Engineering, Xi'an University, Xi'an, China
| | - Yueli Chen
- School of Biology and Pharmaceutical Engineering, Lanzhou Jiaotong University, Lanzhou, China
| | - Yuan Liu
- School of Biology and Environmental Engineering, Xi'an University, Xi'an, China
| | - Yueqing He
- School of Biology and Pharmaceutical Engineering, Lanzhou Jiaotong University, Lanzhou, China
| | - Haoming Wang
- School of Biology and Pharmaceutical Engineering, Lanzhou Jiaotong University, Lanzhou, China
| | - Xiaoxiao Liu
- School of Biology and Environmental Engineering, Xi'an University, Xi'an, China
| | - Jing Xu
- School of Biology and Environmental Engineering, Xi'an University, Xi'an, China
| | - Minjuan Zhao
- School of Biology and Environmental Engineering, Xi'an University, Xi'an, China
| | - Yuanyuan Shen
- School of Biology and Environmental Engineering, Xi'an University, Xi'an, China
| | - Ying Liu
- Shaaxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, China
| | - Gao Tianpeng
- School of Biology and Pharmaceutical Engineering, Lanzhou Jiaotong University, Lanzhou, China
- School of Biology and Environmental Engineering, Xi'an University, Xi'an, China
- Engineering Center for Pollution Control and Ecological Restoration in Mining of Gansu Province, Lanzhou City University, Lanzhou, China
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Salimi F, Khorshidi M, Amirahmadi F, Amirahmadi A. Effectiveness of Phosphate and Zinc Solubilizing Paenarthrobacter nitroguajacolicus P1 as Halotolerant Rhizobacterium with Growth-Promoting Activity on Pistacia vera L. Curr Microbiol 2023; 80:336. [PMID: 37667111 DOI: 10.1007/s00284-023-03448-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 08/15/2023] [Indexed: 09/06/2023]
Abstract
Plant growth-promoting rhizobacteria (PGPR) are beneficial microorganisms to develop microbial fertilizers. Biofertilizers can accelerate plant growth and enhance crop yields. The current research aimed to isolate and identify rhizobacterium with plant growth-promoting activity in the rhizospheric region of pistachio trees in arid and salty region of Iran. In the present study, 26 bacterial isolates were isolated from the rhizospheric region of the pistachio trees. Plant growth-promoting characteristics of isolated bacteria, including the ability to solubilize phosphate and zinc, produce hydrolyzing enzymes, and hydrogen cyanide (HCN), as well as synthesize indole-3-acetic acid (IAA) were evaluated through in vitro assays. Based on these activities, five multifunctional bacterial strains designated P1, P10, P11, P17, and P19 were then applied and their effect was studied on the growth and physiological properties of Pistacia vera L. seedlings by pot experiments under normal conditions. Finally, the most efficient strain has been identified by analysis of the 16S rRNA gene sequence. According to the results, all the isolated bacteria exhibited considerable plant growth-promoting properties. They could produce amylase (n = 26, 2 ± 0.00-13 ± 0.42 mm), lipase (n = 24, 2 ± 0.00-9 ± 0.23 mm), protease (n = 20, 1 ± 0.00-17 ± 0.0 mm), indole-3-acetic acid (n = 26, ranging from 5.05 ± 0.08 to 11.5 ± 0.11 μg/mL) and HCN (n = 24). Six isolates showed significant growth at 20% w/v NaCl. Inoculation of P1, P17, and P19 increased chlorophyll, carotenoid, and phenolic content in treated Pistacia vera L. seedlings. P1 and P11 inoculated plants showed an enhanced level of anthocyanin and proline. These most effective strains were catalase and Gram-positive bacterium and showed antibiotic sensitivity. They can consider as halotolerant PGPR, due to the growth in the presence of NaCl (20% w/v). Finally, P1 inoculated plants exhibited higher levels of sugar content. This strain showed the most similarity (99.92%-1322 bp) to Paenarthrobacter nitroguajacolicus based on 16S rRNA gene sequence. Based on the results, Paenarthrobacter nitroguajacolicus P1 with multiple PGPR can be applied as a promising candidate in the soil-Pistacia vera L. system to improve their productivity and health by increasing available nutrient content, improving photosynthetic parameters, and producing phytohormones and HCN.
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Affiliation(s)
- Fatemeh Salimi
- Department of Cellular and Molecular Biology, School of Biology, Damghan University, Damghan, 36716-41167, Iran.
| | - Mehdi Khorshidi
- Department of Plant Sciences, School of Biology, Damghan University, Damghan, 36716-41167, Iran
| | - Fateme Amirahmadi
- Department of Cellular and Molecular Biology, School of Biology, Damghan University, Damghan, 36716-41167, Iran
| | - Atefe Amirahmadi
- Department of Plant Sciences, School of Biology, Damghan University, Damghan, 36716-41167, Iran
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Li Q, Li X, Ren Z, Du M, Yang J, Yang L, He W, Yang H, Zhao Y, Gu W, Liu W, Zhao W, Li Y. In-silico analysis of atmospheric diffusion, crop planting degrading scheme, and health risk of dioxins from a domestic waste incineration plant. WASTE MANAGEMENT (NEW YORK, N.Y.) 2023; 160:59-68. [PMID: 36791511 DOI: 10.1016/j.wasman.2023.02.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 02/07/2023] [Accepted: 02/09/2023] [Indexed: 06/18/2023]
Abstract
Based on a domestic waste incineration power generation project, the dioxin emission from the waste incineration plant (WIP), phytoextraction and microbial degradation of dioxins, and dioxins human health risks reduction were investigated through in-silico methods. Based on the dioxins concentrations in soil (9.97 × 10-9-7.00 × 10-5ng/g) predicted by atmospheric dispersion model system and the Level-III fugacity model, planting schemes under different wind directions were designed considering the dioxin absorption capacity and the economic benefits for crops (i.e., barley, peanut, pea, maize and wheat). The dioxins in soils can be further degraded by five crops' rhizosphere microorganisms and fertilizers, simulated through molecular dynamic simulations. The enhanced degradation rates of dioxin by rhizosphere microorganisms of five crops reached 15.70 %-28.66 %. Finally, healthy dietary plans were developed to reduce the risk of dioxin exposure to the sensitive populations living around WIP. Results showed that the consumption of maize, fungus, mushroom and bamboo fungus could effectively reduce dioxins toxicity to humans by 58.13 %. The systematic approach developed in this study provided theoretical support for soil remediation and human health risk control of dioxins-contaminated sites.
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Affiliation(s)
- Qing Li
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Xixi Li
- Center for Environmental Health Risk Assessment and Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University, St. John's, NL A1B 3X5, Canada.
| | - Zhixing Ren
- College of Forestry, Northeast Forestry University, Harbin 150040, China.
| | - Meijn Du
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Jiawen Yang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Luze Yang
- College of New Energy and Environment, Jilin University, Changchun 130012, China.
| | - Wei He
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Hao Yang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Yuanyuan Zhao
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Wenwen Gu
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Wei Liu
- School of Environment, Beijing Normal University, 100875, China.
| | - Wenjin Zhao
- College of New Energy and Environment, Jilin University, Changchun 130012, China.
| | - Yu Li
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
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Jain R, Saraf M. ACC deaminase producing PGPR modulates nutrients uptake, soil properties and growth of cluster bean (Cyamopsis tetragonoloba L.) under deficit irrigation. Biologia (Bratisl) 2023. [DOI: 10.1007/s11756-023-01376-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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Xu Y, Zhang Z, Ding H, Wen S, Zhang G, Qin F, Dai L. Comprehensive effects of salt stress and peanut cultivars on the rhizosphere bacterial community diversity of peanut. Arch Microbiol 2021; 204:15. [PMID: 34894277 DOI: 10.1007/s00203-021-02619-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Revised: 11/18/2021] [Accepted: 11/30/2021] [Indexed: 10/19/2022]
Abstract
Plant rhizosphere bacterial communities are central to plant growth and stress tolerance, which differ across cultivars and external environments. The goal of this study was to assess the comprehensive effects of salt stress and peanut cultivars on rhizosphere bacterial community diversity. In this study, we investigated the effects of salt stress on peanut morphology and pod yield and the associated rhizosphere bacterial diversity using statistical analysis and 16S rRNA gene sequencing, respectively. Statistical analysis exhibited that salt stress indeed affected peanut growth and pod yield, and various peanut cultivars showed divergences. Taxonomic analysis showed that the bacterial community predominantly consisted of phyla Actinobacteria, Proteobacteria, Chloroflexi, Acidobacteria, and Cyanobacteria in peanut rhizosphere soils. Among these bacteria, numbers of beneficial bacteria Cyanobacteria and Proteobacteria increased, especially in the salt-resistant cultivars, while that of Acidobacteria decreased after salt treatment. Nitrogen-fixing bacterium Rhizobium closely related to peanut nodulation was significantly improved in rhizosphere soils of salt-resistant cultivars after salt treatment. Metabolic function prediction showed that the percentages of reads categorized to signaling transduction and inorganic ion transport and metabolism were higher in the salt-treated soils, which may be conducive to peanut survival and salt tolerance to some extent. The study is, therefore, crucially important to develop the foundation for improving the salt tolerance of various peanut cultivars via modifying the soil bacterial community.
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Affiliation(s)
- Yang Xu
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, Shandong, China
| | - Zhimeng Zhang
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, Shandong, China
| | - Hong Ding
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, Shandong, China
| | - Saiqun Wen
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, Shandong, China
| | - Guanchu Zhang
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, Shandong, China
| | - Feifei Qin
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, Shandong, China
| | - Liangxiang Dai
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, Shandong, China.
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Hoffmann J, Berni R, Sutera FM, Gutsch A, Hausman JF, Saffie-Siebert S, Guerriero G. The Effects of Salinity on the Anatomy and Gene Expression Patterns in Leaflets of Tomato cv. Micro-Tom. Genes (Basel) 2021; 12:genes12081165. [PMID: 34440339 PMCID: PMC8392013 DOI: 10.3390/genes12081165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 07/23/2021] [Accepted: 07/27/2021] [Indexed: 10/26/2022] Open
Abstract
Salinity is a form of abiotic stress that impacts growth and development in several economically relevant crops and is a top-ranking threat to agriculture, considering the average rise in the sea level caused by global warming. Tomato is moderately sensitive to salinity and shows adaptive mechanisms to this abiotic stressor. A case study on the dwarf tomato model Micro-Tom is here presented in which the response to salt stress (NaCl 200 mM) was investigated to shed light on the changes occurring at the expression level in genes involved in cell wall-related processes, phenylpropanoid pathway, stress response, volatiles' emission and secondary metabolites' production. In particular, the response was analyzed by sampling older/younger leaflets positioned at different stem heights (top and bottom of the stem) and locations along the rachis (terminal and lateral) with the goal of identifying the most responsive one(s). Tomato plants cv. Micro-Tom responded to increasing concentrations of NaCl (0-100-200-400 mM) by reducing the leaf biomass, stem diameter and height. Microscopy revealed stronger effects on leaves sampled at the bottom and the expression analysis identified clusters of genes expressed preferentially in older or younger leaflets. Stress-related genes displayed a stronger induction in lateral leaflets sampled at the bottom. In conclusion, in tomato cv. Micro-Tom subjected to salt stress, the bottom leaflets showed stronger stress signs and response, while top leaflets were less impacted by the abiotic stressor and had an increased expression of cell wall-related genes involved in expansion.
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Affiliation(s)
- Jonas Hoffmann
- Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology, 5, rue Bommel, L-4940 Hautcharage, Luxembourg; (J.H.); (A.G.); (J.-F.H.)
| | - Roberto Berni
- TERRA Teaching and Research Center, Gembloux Agro-Bio Tech, University of Liège, 5030 Gembloux, Belgium;
| | - Flavia Maria Sutera
- SiSaf Ltd., Surrey Research Park, Guildford GU2 7RE, UK; (F.M.S.); (S.S.-S.)
| | - Annelie Gutsch
- Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology, 5, rue Bommel, L-4940 Hautcharage, Luxembourg; (J.H.); (A.G.); (J.-F.H.)
| | - Jean-Francois Hausman
- Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology, 5, rue Bommel, L-4940 Hautcharage, Luxembourg; (J.H.); (A.G.); (J.-F.H.)
| | | | - Gea Guerriero
- Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology, 5, rue Bommel, L-4940 Hautcharage, Luxembourg; (J.H.); (A.G.); (J.-F.H.)
- Correspondence: ; Tel.: +352-27-5888-5096
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Ci D, Tang Z, Ding H, Cui L, Zhang G, Li S, Dai L, Qin F, Zhang Z, Yang J, Xu Y. The synergy effect of arbuscular mycorrhizal fungi symbiosis and exogenous calcium on bacterial community composition and growth performance of peanut (Arachis hypogaea L.) in saline alkali soil. J Microbiol 2020; 59:51-63. [PMID: 33201434 DOI: 10.1007/s12275-021-0317-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 10/12/2020] [Accepted: 10/12/2020] [Indexed: 12/16/2022]
Abstract
Peanut (Arachis hypogaea. L) is an important oil seed crop. Both arbuscular mycorrhizal fungi (AMF) symbiosis and calcium (Ca2+) application can ameliorate the impact of saline soil on peanut production, and the rhizosphere bacterial communities are also closely correlated with peanut salt tolerance; however, whether AMF and Ca2+ can withstand high-salinity through or partially through modulating rhizosphere bacterial communities is unclear. Here, we used the rhizosphere bacterial DNA from saline alkali soil treated with AMF and Ca2+ alone or together to perform high-throughput sequencing of 16S rRNA genes. Taxonomic analysis revealed that AMF and Ca2+ treatment increased the abundance of Proteobacteria and Firmicutes at the phylum level. The nitrogen-fixing bacterium Sphingomonas was the dominant genus in these soils at the genus level, and the soil invertase and urease activities were also increased after AMF and Ca2+ treatment, implying that AMF and Ca2+ effectively improved the living environment of plants under salt stress. Moreover, AMF combined with Ca2+ was better than AMF or Ca2+ alone at altering the bacterial structure and improving peanut growth in saline alkali soil. Together, AMF and Ca2+ applications are conducive to peanut salt adaption by regulating the bacterial community in saline alkali soil.
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Affiliation(s)
- Dunwei Ci
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, Shandong, 266100, P. R. China
| | - Zhaohui Tang
- Biotechnology Research Center, Shandong Academy of Agricultural Sciences/Shandong Key Lab. of Genetic Improvement, Ecology and Physiology of Crops, Jinan, 250100, P. R. China
| | - Hong Ding
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, Shandong, 266100, P. R. China
| | - Li Cui
- Shandong Provincial Crop Germplasm Resource Centre, Shandong Academy of Agricultural Sciences, Jinan, 250100, P. R. China
| | - Guanchu Zhang
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, Shandong, 266100, P. R. China
| | - Shangxia Li
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, Shandong, 266100, P. R. China
| | - Liangxiang Dai
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, Shandong, 266100, P. R. China
| | - Feifei Qin
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, Shandong, 266100, P. R. China
| | - Zhimeng Zhang
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, Shandong, 266100, P. R. China
| | - Jishun Yang
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, Shandong, 266100, P. R. China.
| | - Yang Xu
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, Shandong, 266100, P. R. China.
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Bystrianský L, Hujslová M, Gryndler M. Study of the effects of mineral salts on the biofilm formation on polypropylene fibers using three quantification methods. Folia Microbiol (Praha) 2020; 66:133-143. [PMID: 33104976 DOI: 10.1007/s12223-020-00833-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 10/19/2020] [Indexed: 11/29/2022]
Abstract
The microbial biofilms are ubiquitous in nature and represent important biological entities that affect various aspects of human life. As such, they attracted considerable attention during last decades, with the factors affecting the biofilm development being among the frequently studied topics. In our work, the biofilm was cultivated on the surface of polypropylene fibers in a nutrient medium inoculated by the suspension of two unsterile soils. The effects of ionic strength and valence of salt on the amount of the produced biofilm and on composition of biofilm microbial communities were investigated. The effect of valence was significant in some OTUs: Arthrobacter/Pseudarthrobacter/Paenarthrobacter and Bacillus with positive response to monovalent salt (KCl) and Streptomyces, Lysinibacillus, Pseudomonas, and Ensifer with positive response to divalent salt (MgSO4). The significant preference for a certain concentration of salts was observed in the case of OTUs Agrobacterium, Bacillus (both 100 mM), and Brevundimonas (30 mM). A new quantification method based on measuring of oxidizable organic carbon in biofilm biomass, based on dichromate oxidation, was used. We compared the results obtained using this method with results of crystal violet destaining and measuring of extracted DNA concentration as proxies of the biofilm biomass. The dichromate oxidation is simple, inexpensive, and fast, and our results show that it may be more sensitive than crystal violet destaining. The highest biomass values tended to associate with high concentrations of the divalent salt. This trend was not observed in treatments where the monovalent salt was added. Our data confirm the importance of inorganic ions for biofilm composition and biomass accumulation.
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Affiliation(s)
- Lukáš Bystrianský
- Department of Biology, Faculty of Science, J. E. Purkyně University in Ústí nad Labem, Pasteurova 15, CZ40096, Ústí nad Labem, Czech Republic.
| | - Martina Hujslová
- Laboratory of Fungal Biology, Institute of Microbiology ASCR, v.v.i., Vídeňská 1083, CZ14220, Prague 4, Czech Republic
| | - Milan Gryndler
- Department of Biology, Faculty of Science, J. E. Purkyně University in Ústí nad Labem, Pasteurova 15, CZ40096, Ústí nad Labem, Czech Republic
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A Review on the Beneficial Role of Silicon against Salinity in Non-Accumulator Crops: Tomato as a Model. Biomolecules 2020; 10:biom10091284. [PMID: 32906642 PMCID: PMC7563371 DOI: 10.3390/biom10091284] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 08/30/2020] [Accepted: 09/02/2020] [Indexed: 02/06/2023] Open
Abstract
Salinity is an abiotic stress that affects agriculture by severely impacting crop growth and, consequently, final yield. Considering that sea levels rise at an alarming rate of >3 mm per year, it is clear that salt stress constitutes a top-ranking threat to agriculture. Among the economically important crops that are sensitive to high salinity is tomato (Solanum lycopersicum L.), a cultivar that is more affected by salt stress than its wild counterparts. A strong body of evidence in the literature has proven the beneficial role of the quasi-essential metalloid silicon (Si), which increases the vigor and protects plants against (a)biotic stresses. This protection is realized by precipitating in the cell walls as opaline silica that constitutes a mechanical barrier to the entry of phytopathogens. With respect to Si accumulation, tomato is classified as a non-accumulator (an excluder), similarly to other members of the nightshade family, such as tobacco. Despite the low capacity of accumulating Si, when supplied to tomato plants, the metalloid improves growth under (a)biotic stress conditions, e.g., by enhancing the yield of fruits or by improving vegetative growth through the modulation of physiological parameters. In light of the benefits of Si in crop protection, the available literature data on the effects of this metalloid in mitigating salt stress in tomato are reviewed with a perspective on its use as a biostimulant, boosting the production of fruits as well as their post-harvest stability.
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Xu Y, Zhang G, Ding H, Ci D, Dai L, Zhang Z. Influence of salt stress on the rhizosphere soil bacterial community structure and growth performance of groundnut (Arachis hypogaea L.). Int Microbiol 2020; 23:453-465. [PMID: 31933013 DOI: 10.1007/s10123-020-00118-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 12/29/2019] [Accepted: 01/06/2020] [Indexed: 12/12/2022]
Abstract
Soil salinity is regarded as severe environmental stress that can change the composition of rhizosphere soil bacterial community and import a plethora of harms to crop plants. However, relatively little is known about the relationship between salt stress and root microbial communities in groundnuts. The goal of this study was to assess the effect of salt stress on groundnut growth performance and rhizosphere microbial community structure. Statistical analysis exhibited that salt stress indeed affected groundnut growth and pod yield. Further taxonomic analysis showed that the bacterial community predominantly consisted of phyla Proteobacteria, Actinobacteria, Saccharibacteria, Chloroflexi, Acidobacteria, and Cyanobacteria. Among these bacteria, numbers of Cyanobacteria and Acidobacteria mainly increased, while that of Actinobacteria and Chloroflexi decreased after salt treatment via taxonomic and qPCR analysis. Moreover, Sphingomonas and Microcoleus as the predominant genera in salt-treated rhizosphere soils might enhance salt tolerance as plant growth-promoting rhizobacteria. Metagenomic profiling showed that series of sequences related to signaling transduction, posttranslational modification, and chaperones were enriched in the salt-treated soils, which may have implications for plant survival and salt tolerance. These data will help us better understand the symbiotic relationship between the dominant microbial community and groundnuts and form the foundation for further improvement of salt tolerance of groundnuts via modification of soil microbial community.
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Affiliation(s)
- Yang Xu
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, China
| | - Guanchu Zhang
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, China
| | - Hong Ding
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, China
| | - Dunwei Ci
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, China
| | - Liangxiang Dai
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, China.
| | - Zhimeng Zhang
- Shandong Peanut Research Institute, Shandong Academy of Agricultural Sciences, Qingdao, 266100, China.
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Diversity, community distribution and growth promotion activities of endophytes associated with halophyte Lycium ruthenicum Murr. 3 Biotech 2019; 9:144. [PMID: 30944791 DOI: 10.1007/s13205-019-1678-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 03/14/2019] [Indexed: 02/03/2023] Open
Abstract
The purpose of this study was to investigate the composition, diversity, distribution, and growth promotion activity of endophytic bacteria isolated from L. ruthenicum Murr. Consequently, a total of 109 endophytic bacteria affiliated to 3 phyla, 12 orders and 36 genera were isolated using nine different selective media, from which, Actinobacteria was the dominant taxon containing seven orders at the phylum level; Micrococcales showed the highest diversity containing 12 genera at the family level. Based on PAST and SPSS analysis, species diversity and abundance were mostly isolated from nutritious soil condition (22 genera) and root tissue (27 genera). Furthermore, growth phase showed significant effect on the endophytic bacteria community (28 genera at dormancy and 17 genera at fluorescence stage). With regard to ex situ plant growth-promoting activities, Streptomyces dominated and exhibited broad ability in terms of their potential to grow on nitrogen-free media, synthesize cellulase and lipase enzymes. Characterization of potential plant-beneficial traits indicate that endophytic bacteria exhibited a number of positive activities, including potential diazotrophy (n = 66), phosphate-solubilizing (n = 6), production of lipase (n = 21) and cellulose (n = 35). Two strains, representing Bacillus sp. EGI 63071 and EGI 63106, were found to be effective in promoting the growth of Triticum aestivum (wheat: Xindong No.18) seedling under salt stress conditions.
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