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Nilsson JF, Castellani LG, Draghi WO, Mogro EG, Wibberg D, Winkler A, Hansen LH, Schlüter A, Pühler A, Kalinowski J, Torres Tejerizo GA, Pistorio M. Global transcriptome analysis of Rhizobium favelukesii LPU83 in response to acid stress. FEMS Microbiol Ecol 2020; 97:5998221. [PMID: 33220679 DOI: 10.1093/femsec/fiaa235] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 11/19/2020] [Indexed: 11/13/2022] Open
Abstract
Acidic environments naturally occur worldwide and inappropriate agricultural management may also cause acidification of soils. Low soil pH values are an important barrier in the plant-rhizobia interaction. Acidic conditions disturb the establishment of the efficient rhizobia usually used as biofertilizer. This negative effect on the rhizobia-legume symbiosis is mainly due to the low acid tolerance of the bacteria. Here, we describe the identification of relevant factors in the acid tolerance of Rhizobium favelukesii using transcriptome sequencing. A total of 1924 genes were differentially expressed under acidic conditions, with ∼60% underexpressed. Rhizobium favelukesii acid response mainly includes changes in the energy metabolism and protein turnover, as well as a combination of mechanisms that may contribute to this phenotype, including GABA and histidine metabolism, cell envelope modifications and reverse proton efflux. We confirmed the acid-sensitive phenotype of a mutant in the braD gene, which showed higher expression under acid stress. Remarkably, 60% of the coding sequences encoded in the symbiotic plasmid were underexpressed and we evidenced that a strain cured for this plasmid featured an improved performance under acidic conditions. Hence, this work provides relevant information in the characterization of genes associated with tolerance or adaptation to acidic stress of R. favelukesii.
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Affiliation(s)
- Juliet F Nilsson
- IBBM (Instituto de Biotecnología y Biología Molecular), CCT-La Plata, CONICET, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 49 y 115, 1900 La Plata, Argentina
| | - Lucas G Castellani
- IBBM (Instituto de Biotecnología y Biología Molecular), CCT-La Plata, CONICET, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 49 y 115, 1900 La Plata, Argentina
| | - Walter O Draghi
- IBBM (Instituto de Biotecnología y Biología Molecular), CCT-La Plata, CONICET, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 49 y 115, 1900 La Plata, Argentina
| | - Ezequiel G Mogro
- IBBM (Instituto de Biotecnología y Biología Molecular), CCT-La Plata, CONICET, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 49 y 115, 1900 La Plata, Argentina
| | - Daniel Wibberg
- CeBiTec, Bielefeld University, D-33615, Bielefeld, Germany
| | - Anika Winkler
- CeBiTec, Bielefeld University, D-33615, Bielefeld, Germany
| | - L H Hansen
- Section of Microbial Ecology and Biotechnology, Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Frederiksberg, Denmark
| | | | - Alfred Pühler
- CeBiTec, Bielefeld University, D-33615, Bielefeld, Germany
| | | | - Gonzalo A Torres Tejerizo
- IBBM (Instituto de Biotecnología y Biología Molecular), CCT-La Plata, CONICET, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 49 y 115, 1900 La Plata, Argentina
| | - Mariano Pistorio
- IBBM (Instituto de Biotecnología y Biología Molecular), CCT-La Plata, CONICET, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 49 y 115, 1900 La Plata, Argentina
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Philippe F, Verdu I, Morère-Le Paven MC, Limami AM, Planchet E. Involvement of Medicago truncatula glutamate receptor-like channels in nitric oxide production under short-term water deficit stress. JOURNAL OF PLANT PHYSIOLOGY 2019; 236:1-6. [PMID: 30836205 DOI: 10.1016/j.jplph.2019.02.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 02/14/2019] [Accepted: 02/15/2019] [Indexed: 05/25/2023]
Abstract
Early stages of plant development are highly susceptible to environmental cues, and seedlings have to develop sophisticated mechanisms to sense and respond to abiotic stresses. We have previously identified that abscisic acid (ABA), nitric oxide (NO) and modulation of nitrogen metabolism are involved in adaptive responses in Medicago truncatula seedlings under water deficit stress. Here, we investigated whether glutamate receptor-like channels (GLRs) played a role in the developmental physiological processes of Medicago seedlings during post-germination after a short-term water deficit stress. Twenty-nine independent MtGLR genes have been identified and then divided into four clades following a phylogenetic analysis; seventeen of them exhibited specific domains which are characteristic of animal ionotropic glutamate receptors. Under drought stress, ABA-induced NO accumulation was significantly reduced in presence of a GLR competitive antagonist, suggesting that this water deficit-induced endogenous NO production was mediated through a MtGLR-dependent pathway. Water deficit-induced inhibition of embryo axis elongation was strongly reduced whereas loss of water content was alleviated when MtGLRs were inhibited. These results suggest that glutamate receptors-like channels are required, through their involvement in NO production, in adaptive responses under short-term water-deficit stress during Medicago seedling establishment.
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Affiliation(s)
- Florian Philippe
- IRHS, Université d'Angers, INRA, Agrocampus-Ouest, SFR 4207 QuaSaV, 49071, Beaucouzé, France
| | - Isabelle Verdu
- IRHS, Université d'Angers, INRA, Agrocampus-Ouest, SFR 4207 QuaSaV, 49071, Beaucouzé, France
| | | | - Anis M Limami
- IRHS, Université d'Angers, INRA, Agrocampus-Ouest, SFR 4207 QuaSaV, 49071, Beaucouzé, France
| | - Elisabeth Planchet
- IRHS, Université d'Angers, INRA, Agrocampus-Ouest, SFR 4207 QuaSaV, 49071, Beaucouzé, France.
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