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Santander C, González F, Pérez U, Ruiz A, Aroca R, Santos C, Cornejo P, Vidal G. Enhancing Water Status and Nutrient Uptake in Drought-Stressed Lettuce Plants ( Lactuca sativa L.) via Inoculation with Different Bacillus spp. Isolated from the Atacama Desert. Plants (Basel) 2024; 13:158. [PMID: 38256712 PMCID: PMC10818642 DOI: 10.3390/plants13020158] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 12/26/2023] [Accepted: 01/04/2024] [Indexed: 01/24/2024]
Abstract
Drought is a major challenge for agriculture worldwide, being one of the main causes of losses in plant production. Various studies reported that some soil's bacteria can improve plant tolerance to environmental stresses by the enhancement of water and nutrient uptake by plants. The Atacama Desert in Chile, the driest place on earth, harbors a largely unexplored microbial richness. This study aimed to evaluate the ability of various Bacillus sp. from the hyper arid Atacama Desert in the improvement in tolerance to drought stress in lettuce (Lactuca sativa L. var. capitata, cv. "Super Milanesa") plants. Seven strains of Bacillus spp. were isolated from the rhizosphere of the Chilean endemic plants Metharme lanata and Nolana jaffuelii, and then identified using the 16s rRNA gene. Indole acetic acid (IAA) production, phosphate solubilization, nitrogen fixation, and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity were assessed. Lettuce plants were inoculated with Bacillus spp. strains and subjected to two different irrigation conditions (95% and 45% of field capacity) and their biomass, net photosynthesis, relative water content, photosynthetic pigments, nitrogen and phosphorus uptake, oxidative damage, proline production, and phenolic compounds were evaluated. The results indicated that plants inoculated with B. atrophaeus, B. ginsengihumi, and B. tequilensis demonstrated the highest growth under drought conditions compared to non-inoculated plants. Treatments increased biomass production and were strongly associated with enhanced N-uptake, water status, chlorophyll content, and photosynthetic activity. Our results show that specific Bacillus species from the Atacama Desert enhance drought stress tolerance in lettuce plants by promoting several beneficial plant traits that facilitate water absorption and nutrient uptake, which support the use of this unexplored and unexploited natural resource as potent bioinoculants to improve plant production under increasing drought conditions.
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Affiliation(s)
- Christian Santander
- Departamento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Temuco 4811230, Chile; (C.S.); (F.G.); (U.P.); (A.R.); (C.S.)
- Grupo de Ingeniería Ambiental y Biotecnología, Facultad de Ciencias Ambientales y Centro EULA-Chile, Universidad de Concepción, Concepción 4070411, Chile
| | - Felipe González
- Departamento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Temuco 4811230, Chile; (C.S.); (F.G.); (U.P.); (A.R.); (C.S.)
- Programa de Doctorado en Ciencias Mención Biología Celular y Molecular Aplicada, Universidad de La Frontera, Temuco 4811230, Chile
| | - Urley Pérez
- Departamento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Temuco 4811230, Chile; (C.S.); (F.G.); (U.P.); (A.R.); (C.S.)
| | - Antonieta Ruiz
- Departamento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Temuco 4811230, Chile; (C.S.); (F.G.); (U.P.); (A.R.); (C.S.)
| | - Ricardo Aroca
- Departamento de Microbiología del Suelo y la Planta, Estación Experimental del Zaidín, CSIC, Profesor Albareda 1, 18008 Granada, Spain;
| | - Cledir Santos
- Departamento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Temuco 4811230, Chile; (C.S.); (F.G.); (U.P.); (A.R.); (C.S.)
| | - Pablo Cornejo
- Escuela de Agronomía, Facultad de Ciencias Agronómicas y de los Alimentos, Pontificia Universidad Católica de Valparaíso, Quillota 2260000, Chile
- Centro Regional de Investigación e Innovación para la Sostenibilidad de la Agricultura y los Territorios Rurales, CERES, La Palma, Quillota 2260000, Chile
| | - Gladys Vidal
- Grupo de Ingeniería Ambiental y Biotecnología, Facultad de Ciencias Ambientales y Centro EULA-Chile, Universidad de Concepción, Concepción 4070411, Chile
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Peng M, Jiang Z, Zhou F, Wang Z. From salty to thriving: plant growth promoting bacteria as nature's allies in overcoming salinity stress in plants. Front Microbiol 2023; 14:1169809. [PMID: 37426022 PMCID: PMC10327291 DOI: 10.3389/fmicb.2023.1169809] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 06/09/2023] [Indexed: 07/11/2023] Open
Abstract
Soil salinity is one of the main problems that affects global crop yield. Researchers have attempted to alleviate the effects of salt stress on plant growth using a variety of approaches, including genetic modification of salt-tolerant plants, screening the higher salt-tolerant genotypes, and the inoculation of beneficial plant microbiome, such as plant growth-promoting bacteria (PGPB). PGPB mainly exists in the rhizosphere soil, plant tissues and on the surfaces of leaves or stems, and can promote plant growth and increase plant tolerance to abiotic stress. Many halophytes recruit salt-resistant microorganisms, and therefore endophytic bacteria isolated from halophytes can help enhance plant stress responses. Beneficial plant-microbe interactions are widespread in nature, and microbial communities provide an opportunity to understand these beneficial interactions. In this study, we provide a brief overview of the current state of plant microbiomes and give particular emphasis on its influence factors and discuss various mechanisms used by PGPB in alleviating salt stress for plants. Then, we also describe the relationship between bacterial Type VI secretion system and plant growth promotion.
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Affiliation(s)
- Mu Peng
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, China
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China
| | - Zhihui Jiang
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China
| | - Fangzhen Zhou
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, China
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China
| | - Zhiyong Wang
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, China
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