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Carvalho TLG, Rosman AC, Grativol C, de M. Nogueira E, Baldani JI, Hemerly AS. Sugarcane Genotypes with Contrasting Biological Nitrogen Fixation Efficiencies Differentially Modulate Nitrogen Metabolism, Auxin Signaling, and Microorganism Perception Pathways. Plants (Basel) 2022; 11:1971. [PMID: 35956449 PMCID: PMC9370643 DOI: 10.3390/plants11151971] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Revised: 07/19/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
Sugarcane is an economically important crop that is used for the production of fuel ethanol. Diazotrophic bacteria have been isolated from sugarcane tissues, without causing visible plant anatomical changes or disease symptoms. These bacteria can be beneficial to the plant by promoting root growth and an increase in plant yield. Different rates of Biological Nitrogen Fixation (BNF) were observed in different genotypes. The aim of this work was to conduct a comprehensive molecular and physiological analysis of two model genotypes for contrasting BNF efficiency in order to unravel plant genes that are differentially regulated during a natural association with diazotrophic bacteria. A next-generation sequencing of RNA samples from the genotypes SP70-1143 (high-BNF) and Chunee (low-BNF) was performed. A differential transcriptome analysis showed that several pathways were differentially regulated among the two BNF-contrasting genotypes, including nitrogen metabolism, hormone regulation and bacteria recognition. Physiological analyses, such as nitrogenase and GS activity quantification, bacterial colonization, auxin response and root architecture evaluation, supported the transcriptome expression analyses. The differences observed between the genotypes may explain, at least in part, the differences in BNF contributions. Some of the identified genes might be involved in key regulatory processes for a beneficial association and could be further used as tools for obtaining more efficient BNF genotypes.
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Affiliation(s)
- Thais Louise G. Carvalho
- Laboratório de Biologia Molecular de Plantas, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-901, RJ, Brazil; (T.L.G.C.); (A.C.R.); (C.G.); (E.d.M.N.)
| | - Aline C. Rosman
- Laboratório de Biologia Molecular de Plantas, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-901, RJ, Brazil; (T.L.G.C.); (A.C.R.); (C.G.); (E.d.M.N.)
| | - Clícia Grativol
- Laboratório de Biologia Molecular de Plantas, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-901, RJ, Brazil; (T.L.G.C.); (A.C.R.); (C.G.); (E.d.M.N.)
- Laboratório de Química e Funções de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes 28015-622, RJ, Brazil
| | - Eduardo de M. Nogueira
- Laboratório de Biologia Molecular de Plantas, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-901, RJ, Brazil; (T.L.G.C.); (A.C.R.); (C.G.); (E.d.M.N.)
| | - José Ivo Baldani
- Laboratório de Genética e Bioquímica, Centro Nacional de Pesquisa de Agrobiologia, Embrapa Agrobiologia, Rio de Janeiro 23897-970, RJ, Brazil;
| | - Adriana S. Hemerly
- Laboratório de Biologia Molecular de Plantas, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-901, RJ, Brazil; (T.L.G.C.); (A.C.R.); (C.G.); (E.d.M.N.)
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Ballesteros HGF, Rosman AC, Carvalho TLG, Grativol C, Hemerly AS. Cell wall formation pathways are differentially regulated in sugarcane contrasting genotypes associated with endophytic diazotrophic bacteria. Planta 2021; 254:109. [PMID: 34705112 DOI: 10.1007/s00425-021-03768-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 06/15/2021] [Accepted: 10/20/2021] [Indexed: 06/13/2023]
Abstract
Differences in cell wall components between two BNF-contrasting sugarcane genotypes might result from genetic variations particular to the genotype and from the efficiency in diazotrophic bacteria association. Sugarcane is a plant of the grass family (Poaceae) that is highly cultivated in Brazil, as an important energy resource. Commercial sugarcane genotypes may be successfully associated with beneficial endophytic nitrogen-fixing bacteria, which can influence several plant metabolic pathways, such as cell division and growth, synthesis of hormones, and defense compounds. In this study, we investigated how diazotrophic bacteria associated with sugarcane plants could be involved in the regulation of cell wall formation pathways. A molecular and structural characterization of the cell wall was compared between two genotypes of sugarcane with contrasting rates of Biological Nitrogen Fixation (BNF): SP70-1143 (high BNF) and Chunee (low BNF). Differentially expressed transcripts were identified in transcriptomes generated from SP70-1143 and Chunee. Expression profiles of cellulose and lignin genes, which were more expressed in SP70-1134, and callose genes, which were more expressed in Chunee, were validated by RT-qPCR and microscopic analysis of cell wall components in tissue sections. A similar expression profile in both BNF-contrasting genotypes was observed in naturally colonized plants and in plants inoculated with G. diazotrophicus. Cell walls of the high BNF genotype have a greater cellulose content, which might contribute to increase biomass. In parallel, callose was concentrated in the vascular tissues of the low BNF genotype and could possibly represent a barrier for an efficient bacterial colonization and dissemination in sugarcane tissues. Our data show a correlation between the gene profiles identified in the BNF-contrasting genotypes and a successful association with endophytic diazotrophic bacteria.
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Affiliation(s)
- Helkin Giovani F Ballesteros
- Laboratório de Biologia Molecular de Plantas, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-590, Brazil
| | - Aline C Rosman
- Laboratório de Biologia Molecular de Plantas, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-590, Brazil
| | - Thais Louise G Carvalho
- Laboratório de Biologia Molecular de Plantas, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-590, Brazil
- Departamento de Biologia, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Clicia Grativol
- Laboratório de Biologia Molecular de Plantas, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-590, Brazil
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
| | - Adriana Silva Hemerly
- Laboratório de Biologia Molecular de Plantas, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-590, Brazil.
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