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Genomic, Molecular, and Phenotypic Characterization of Arthrobacter sp. OVS8, an Endophytic Bacterium Isolated from and Contributing to the Bioactive Compound Content of the Essential Oil of the Medicinal Plant Origanum vulgare L. Int J Mol Sci 2023; 24:ijms24054845. [PMID: 36902273 PMCID: PMC10002853 DOI: 10.3390/ijms24054845] [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: 02/03/2023] [Revised: 02/24/2023] [Accepted: 02/25/2023] [Indexed: 03/06/2023] Open
Abstract
Medicinal plants play an important role in the discovery of new bioactive compounds with antimicrobial activity, thanks to their pharmacological properties. However, members of their microbiota can also synthesize bioactive molecules. Among these, strains belonging to the genera Arthrobacter are commonly found associated with the plant's microenvironments, showing plant growth-promoting (PGP) activity and bioremediation properties. However, their role as antimicrobial secondary metabolite producers has not been fully explored. The aim of this work was to characterize the Arthrobacter sp. OVS8 endophytic strain, isolated from the medicinal plant Origanum vulgare L., from molecular and phenotypic viewpoints to evaluate its adaptation and influence on the plant internal microenvironments and its potential as a producer of antibacterial volatile molecules (VOCs). Results obtained from the phenotypic and genomic characterization highlight its ability to produce volatile antimicrobials effective against multidrug-resistant (MDR) human pathogens and its putative PGP role as a producer of siderophores and degrader of organic and inorganic pollutants. The outcomes presented in this work identify Arthrobacter sp. OVS8 as an excellent starting point toward the exploitation of bacterial endophytes as antibiotics sources.
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Chhetri G, Kim I, Kim J, So Y, Park S, Jung Y, Seo T. Paraburkholderia tagetis sp. nov., a novel species isolated from roots of Tagetes patula enhances the growth and yield of Solanum lycopersicum L. (tomato). Front Microbiol 2023; 14:1140484. [PMID: 37082173 PMCID: PMC10110911 DOI: 10.3389/fmicb.2023.1140484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 03/21/2023] [Indexed: 04/22/2023] Open
Abstract
A multifunctional, Gram-stain-negative, aerobic, motile by flagella, short-rod shaped bacteria, designated strain RG36T was isolated from roots of marigold plant (Tagetes patula) sampled at Dongguk University, Republic of Korea. A 16S rRNA sequences indicated that the closest phylogenetic neighbors were Paraburkholderia acidiphila 7Q-K02T (99.0%) and Paraburkholderia sacchari IPT101T (98.9%) of the family Burkholderiaceae. The draft genome size was 8.52 Mb (63.7% GC). The genome contained 7,381 coding sequences. Digital DNA-DNA hybridization (dDDH) and average nucleotide identity (ANI) values of strain RG36T with its most closely related species were only 83.1-88.7 and 27.6-36.7%, respectively. Strain RG36T contained Q-8 as the major respiratory quinone and its main fatty acids (>10%) were C16:0, C17:0 cyclo, C19:0 cyclo ω8c, and summed feature 8 (comprising C18:1 ω7c and/or C18:1 ω6c). Strain RG36T accumulates polyhydroxybutyrates (PHB) and exhibits multiple plant growth-promoting properties including production of indole-3-acetic acid (IAA), siderophores, protease, phosphate solubilization, and harboring gene clusters for its multifunctional properties. A pot experiment was conducted to evaluate the effect of PGPR on the growth of Solanum lycopersicum L. (Tomato). Result also confirmed the ability of strain RG36T to promote tomato plant growth, especially it increases the yield of tomatoes. Structural assessment of the bioplastic by Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR), and GC-MS spectroscopy, which confirmed the structure of the polymer as PHB. Our study revealed the potential of strain RG36T to promote the growth of tomato plant and fruit yield by stimulating the various phytohormones, which could be use as bio-fertilizers to reduce the use of chemical fertilizers and promotes sustainable agricultural production. The phenotypic, chemotaxonomic and phylogenetic data, and genome analysis showed that strain RG36T represents a novel species of the genus Paraburkholderia, for which the name Paraburkholderia tagetis sp. nov. is proposed. The type strain is RG36T (=KACC 22685T = TBRC 15696T).
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Liu SY, Wang QQ, Lei YH, Wang SS, Chen KL, Li Y, Xiong J, Liang XJ, Zhou X, Li YK, Sun YF. Elucidating the interaction of rhizosphere bacteria and environmental factors in influencing active ingredient content of Lycium barbarum fruit in China. J Appl Microbiol 2022; 132:3783-3796. [PMID: 35191572 DOI: 10.1111/jam.15502] [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: 01/28/2022] [Revised: 02/16/2022] [Accepted: 02/17/2022] [Indexed: 11/30/2022]
Abstract
AIMS This study aimed to compare the differences in the bacterial community structure of L. barbarum rhizosphere and elucidate the contribution of rhizosphere bacteria to the active ingredients of L. barbarum fruit. METHODS AND RESULTS This study investigated the soil and meteorological characteristics of L. barbarum rhizosphere during three growth stages across three production regions of China. High-throughput sequencing showed significant differences in the bacterial community diversity of L. barbarum rhizosphere across the three production regions, and norank_o_Gaiellales, norank_f_Anaerolineaceae, and norank_f_AKYG1722 were the highest in Ningxia. In addition, regression and path analysis revealed that pH, norank_o_Gaiellales, and norank_f_AKYG1722 significantly promoted the accumulation of total sugar and flavonoids in L. barbarum fruit directly or indirectly. Soil organic matter (SOM), norank_f_Anaerolineaceae, and humidity significantly promoted the accumulation of betaine. The average temperature during the growth stages, norank_f_AKYG1722, and norank_o_Gaiellales promoted the accumulation of polysaccharides. CONCLUSIONS The interaction between rhizosphere bacteria and environmental factors promoted the accumulation of active ingredients in L. barbarum fruits. SIGNIFICANCE AND IMPACT OF THE STUDY Our results provided insights to improve the quality of L. barbarum fruit.
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Affiliation(s)
- Si Yang Liu
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang, China
| | - Qi Qi Wang
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang, China
| | - Yong Hui Lei
- Department of Plant protection, College of Agriculture, Shihezi University, Shihezi, Xinjiang, China
| | - Sai Sai Wang
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang, China
| | - Kai Li Chen
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang, China
| | - Yang Li
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang, China
| | - Jie Xiong
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang, China
| | - Xiao Jie Liang
- National Wolfberry Engineering Research Center, Ningxia Academy of Agriculture and Forestry Sciences, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia, China.,Institute of Wolfberry Engineer Technology, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia, China
| | - Xuan Zhou
- National Wolfberry Engineering Research Center, Ningxia Academy of Agriculture and Forestry Sciences, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia, China.,Institute of Wolfberry Engineer Technology, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia, China
| | - Yue Kun Li
- National Wolfberry Engineering Research Center, Ningxia Academy of Agriculture and Forestry Sciences, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia, China.,Institute of Wolfberry Engineer Technology, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia, China
| | - Yan Fei Sun
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang, China
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Srinivasan J, Khadka J, Novoplansky N, Gillor O, Grafi G. Endophytic Bacteria Colonizing the Petiole of the Desert Plant Zygophyllum dumosum Boiss: Possible Role in Mitigating Stress. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11040484. [PMID: 35214818 PMCID: PMC8924888 DOI: 10.3390/plants11040484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/03/2022] [Accepted: 02/09/2022] [Indexed: 05/13/2023]
Abstract
Zygophyllum dumosum is a dominant shrub in the Negev Desert whose survival is accomplished by multiple mechanisms including abscission of leaflets to reduce whole plant transpiration while leaving the fleshy, wax-covered petioles alive but dormant during the dry season. Petioles that can survive for two full growing seasons maintain cell component integrity and resume metabolic activity at the beginning of the winter. This remarkable survival prompted us to investigate endophytic bacteria colonizing the internal tissues of the petiole and assess their role in stress tolerance. Twenty-one distinct endophytes were isolated by culturing from surface-sterile petioles and identified by sequencing of the 16S rDNA. Sequence alignments and the phylogenetic tree clustered the isolated endophytes into two phyla, Firmicutes and Actinobacteria. Most isolated endophytes displayed a relatively slow growth on nutrient agar, which was accelerated by adding petiole extracts. Metabolic analysis of selected endophytes showed several common metabolites whose level is affected by petiole extract in a species-dependent manner including phosphoric acid, pyroglutamic acid, and glutamic acid. Other metabolites appear to be endophyte-specific metabolites, such as proline and trehalose, which were implicated in stress tolerance. These results demonstrate the existence of multiple endophytic bacteria colonizing Z. dumosum petioles with the potential role in maintaining cell integrity and functionality via synthesis of multiple beneficial metabolites that mitigate stress and contribute to stress tolerance.
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Affiliation(s)
- Jansirani Srinivasan
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel; (J.S.); (J.K.); (N.N.)
- Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel;
| | - Janardan Khadka
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel; (J.S.); (J.K.); (N.N.)
| | - Nurit Novoplansky
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel; (J.S.); (J.K.); (N.N.)
| | - Osnat Gillor
- Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel;
| | - Gideon Grafi
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel; (J.S.); (J.K.); (N.N.)
- Correspondence:
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Ajilogba CF, Olanrewaju OS, Babalola OO. Improving Bambara Groundnut Production: Insight Into the Role of Omics and Beneficial Bacteria. FRONTIERS IN PLANT SCIENCE 2022; 13:836133. [PMID: 35310649 PMCID: PMC8929175 DOI: 10.3389/fpls.2022.836133] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 02/04/2022] [Indexed: 05/05/2023]
Abstract
With the rise in the world population, environmental hazards caused by chemical fertilizers, and a decrease in food supply due to global climate change, food security has become very pertinent. In addition, considerable parts of agriculture lands have been lost to urbanization. It has therefore been projected that at the present rate of population increase coupled with the other mentioned factors, available food will not be enough to feed the world. Hence, drastic approach is needed to improve agriculture output as well as human sustainability. Application of environmentally sustainable approach, such as the use of beneficial microbes, and improved breeding of underutilized legumes are one of the proposed sustainable ways of achieving food security. Microbiome-assisted breeding in underutilized legumes is an untapped area with great capabilities to improve food security. Furthermore, revolution in genomics adaptation to crop improvement has changed the approach from conventional breeding to more advanced genomic-assisted breeding on the host plant and its microbiome. The use of rhizobacteria is very important to improving crop yield, especially rhizobacteria from legumes like Bambara groundnut (BGN). BGN is an important legume in sub-Saharan Africa with high ability to tolerate drought and thrive well in marginalized soils. BGN and its interaction with various rhizobacteria in the soil could play a vital role in crop production and protection. This review focus on the importance of genomics application to BGN and its microbiome with the view of setting a potential blueprint for improved BGN breeding through integration of beneficial bacteria.
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Affiliation(s)
- Caroline Fadeke Ajilogba
- Food Security and Safety Focus Area, Faculty of Natural and Agricultural Science, North-West University, Mafikeng, South Africa
- Division of Agrometeorology, Agricultural Research Council, Natural Resources and Engineering, Pretoria, South Africa
| | - Oluwaseyi Samuel Olanrewaju
- Food Security and Safety Focus Area, Faculty of Natural and Agricultural Science, North-West University, Mafikeng, South Africa
| | - Olubukola Oluranti Babalola
- Food Security and Safety Focus Area, Faculty of Natural and Agricultural Science, North-West University, Mafikeng, South Africa
- *Correspondence: Olubukola Oluranti Babalola,
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Barrera-Galicia GC, Peniche-Pavía HA, Peña-Cabriales JJ, Covarrubias SA, Vera-Núñez JA, Délano-Frier JP. Metabolic Footprints of Burkholderia Sensu Lato Rhizosphere Bacteria Active against Maize Fusarium Pathogens. Microorganisms 2021; 9:microorganisms9102061. [PMID: 34683382 PMCID: PMC8538949 DOI: 10.3390/microorganisms9102061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/20/2021] [Accepted: 09/24/2021] [Indexed: 11/16/2022] Open
Abstract
Consistent with their reported abundance in soils, several Burkholderia sensu lato strains were isolated from the rhizosphere of maize plants cultivated at different sites in central México. Comparative analysis of their 16S rRNA gene sequences permitted their separation into three distinctive clades, which were further subdivided into six other clusters by their close resemblance to (1) Trinickia dinghuensis; (2) Paraburkholderia kirstenboschensis, P. graminis, P. dilworthii and P. rhynchosiae; (3) B. gladioli; (4) B. arboris; (5) B. contaminans, or (6) B. metallica representative species. Direct confrontation assays revealed that these strains inhibited the growth of pathogenic Fusarium oxysporum f. sp. radicis-lycopersici, and F. verticillioides within a roughly 3-55% inhibition range. The use of a DIESI-based non-targeted mass spectroscopy experimental strategy further indicated that this method is an option for rapid determination of the pathogen inhibitory capacity of Burkholderia sensu lato strains based solely on the analysis of their exometabolome. Furthermore, it showed that the highest anti-fungal activity observed in B. contaminans and B. arboris was associated with a distinctive abundance of certain m/z ions, some of which were identified as components of the ornbactin and pyochelin siderophores. These results highlight the chemical diversity of Burkholderia sensu lato bacteria and suggest that their capacity to inhibit the Fusarium-related infection of maize in suppressive soils is associated with siderophore synthesis.
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Affiliation(s)
- Guadalupe C. Barrera-Galicia
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Unidad Irapuato, Irapuato 36824, Guanajuato, Mexico; (G.C.B.-G.); (H.A.P.-P.); (J.J.P.-C.)
| | - Héctor A. Peniche-Pavía
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Unidad Irapuato, Irapuato 36824, Guanajuato, Mexico; (G.C.B.-G.); (H.A.P.-P.); (J.J.P.-C.)
| | - Juan José Peña-Cabriales
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Unidad Irapuato, Irapuato 36824, Guanajuato, Mexico; (G.C.B.-G.); (H.A.P.-P.); (J.J.P.-C.)
| | - Sergio A. Covarrubias
- Área de Ciencias de la Salud, Ciudad Universitaria Campus Siglo XXI, Universidad Autónoma de Zacatecas, Zacatecas 98160, Zacatecas, Mexico; (S.A.C.); (J.A.V.-N.)
| | - José A. Vera-Núñez
- Área de Ciencias de la Salud, Ciudad Universitaria Campus Siglo XXI, Universidad Autónoma de Zacatecas, Zacatecas 98160, Zacatecas, Mexico; (S.A.C.); (J.A.V.-N.)
| | - John P. Délano-Frier
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Unidad Irapuato, Irapuato 36824, Guanajuato, Mexico; (G.C.B.-G.); (H.A.P.-P.); (J.J.P.-C.)
- Correspondence: ; Tel.: +52-462-623-9600
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Kong WL, Wang YH, Wu XQ. Enhanced Iron Uptake in Plants by Volatile Emissions of Rahnella aquatilis JZ-GX1. FRONTIERS IN PLANT SCIENCE 2021; 12:704000. [PMID: 34394158 PMCID: PMC8362888 DOI: 10.3389/fpls.2021.704000] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 06/25/2021] [Indexed: 06/13/2023]
Abstract
Iron deficiency in soil has crucially restricted agricultural and forestry production. Volatile organic compounds (VOCs) produced by beneficial microorganisms have been proven to play an important role in inducing abiotic stress tolerance in plants. We investigated the effects of VOCs released by the rhizobacterium Rahnella aquatilis JZ-GX1 on the growth and root parameters of Arabidopsis thaliana under iron deficiency. The effect of the rhizobacterial VOCs on the gene expression in iron uptake and hormone signaling pathways were detected by RT-qPCR. Finally, the VOCs of the JZ-GX1 strain that could promote plant growth under iron deficiency stress were screened. The results showed that the JZ-GX1 strain could induce A. thaliana tolerance to iron deficiency stress by promoting the development of lateral roots and root hairs and increasing the activities of H+ ATPase and Fe3+ reductase. In addition, the AHA2, FRO2, and IRT1 genes of A. thaliana exposed to JZ-GX1-emitted VOCs were upregulated 25-, 1. 81-, and 1.35-fold, respectively, and expression of the abscisic acid (ABA) synthesis gene NCED3 was upregulated on both the 3rd and 5th days. Organic compounds were analyzed in the headspace of JZ-GX1 cultures, 2-undecanone and 3-methyl-1-butanol were found to promote Medicago sativa and A. thaliana growth under iron-limited conditions. These results demonstrated that the VOCs of R. aquatilis JZ-GX1 have good potential in promoting iron absorption in plants.
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Affiliation(s)
- Wei-Liang Kong
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing, China
- Jiangsu Key Laboratory for Prevention and Management of Invasive Species, Nanjing Forestry University, Nanjing, China
| | - Ya-Hui Wang
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing, China
- Jiangsu Key Laboratory for Prevention and Management of Invasive Species, Nanjing Forestry University, Nanjing, China
| | - Xiao-Qin Wu
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing, China
- Jiangsu Key Laboratory for Prevention and Management of Invasive Species, Nanjing Forestry University, Nanjing, China
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Puente ML, Maroniche GA, Panepucci M, Sabio Y García J, García JE, Criado MV, Molina R, Cassán F. Localization and survival of Azospirillum brasilense Az39 in soybean leaves. Lett Appl Microbiol 2021; 72:626-633. [PMID: 33354785 DOI: 10.1111/lam.13444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 12/17/2020] [Accepted: 12/18/2020] [Indexed: 11/30/2022]
Abstract
In recent years, foliar inoculation has gained acceptance among the available methods to deliver plant beneficial micro-organisms to crops under field conditions. Colonization efficiency by such micro-organisms largely depends on their ability to survive when applied on the leaves. In this work, we evaluated the survival and localization of Azospirillum brasilense Az39 (Az39) in excised soybean leaves. Scanning electron microscopy and confocal laser scanning microscopy of a red fluorescent-transformed variant of Az39 were used to determine bacterial localization, while the most probable number and plate count methods were applied for bacterial quantification. Microscopic observations indicated a decrease in the number of Az39 cells on the leaf surface at 24 h after treatment, whereas midribs and cell-cell junctions of the inner leaf epidermis became highly populated zones. The presence of Az39 inside xylem vessels was corroborated at 6 h after bacterization. Az39 population did not significantly decrease throughout 24 h. We could visualize Az39 cells on the surface and in internal tissues of soybean leaves and recover them through culture methodologies. These results evidence the survival capacity of Az39 on and inside leaves and suggest a previously unnoticed endophytic potential for this well-known plant growth-promoting rhizobacteria strain.
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Affiliation(s)
- M L Puente
- Instituto de Microbiología y Zoología Agrícola, Instituto Nacional de Tecnología Agropecuaria (INTA-IMYZA), Castelar, Argentina
| | - G A Maroniche
- Facultad de Ciencias Agrarias, CONICET, Universidad Nacional de Mar del Plata, Balcarce, Argentina
| | - M Panepucci
- Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - J Sabio Y García
- Instituto de Biotecnología-IABIMO, INTA-CONICET, INTA Castelar, Buenos Aires, Argentina
| | - J E García
- Instituto de Microbiología y Zoología Agrícola, Instituto Nacional de Tecnología Agropecuaria (INTA-IMYZA), Castelar, Argentina
| | - M V Criado
- Facultad de Agronomía, Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA)-CONICET, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - R Molina
- Laboratorio de Fisiología Vegetal e Interacción Planta-Microorganismo, Instituto de Investigaciones Agrobiotecnológicas, INIAB-CONICET, Río Cuarto, Argentina
| | - F Cassán
- Laboratorio de Fisiología Vegetal e Interacción Planta-Microorganismo, Instituto de Investigaciones Agrobiotecnológicas, INIAB-CONICET, Río Cuarto, Argentina
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