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Poitout A, Martinière A, Kucharczyk B, Queruel N, Silva-Andia J, Mashkoor S, Gamet L, Varoquaux F, Paris N, Sentenac H, Touraine B, Desbrosses G. Local signalling pathways regulate the Arabidopsis root developmental response to Mesorhizobium loti inoculation. J Exp Bot 2017; 68:1199-1211. [PMID: 28199673 DOI: 10.1093/jxb/erw502] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Numerous reports have shown that various rhizobia can interact with non-host plant species, improving mineral nutrition and promoting plant growth. To further investigate the effects of such non-host interactions on root development and functions, we inoculated Arabidopsis thaliana with the model nitrogen fixing rhizobacterium Mesorhizobium loti (strain MAFF303099). In vitro, we show that root colonization by M. loti remains epiphytic and that M. loti cells preferentially grow at sites where primary and secondary roots intersect. Besides resulting in an increase in shoot biomass production, colonization leads to transient inhibition of primary root growth, strong promotion of root hair elongation and increased apoplasmic acidification in periphery cells of a sizeable part of the root system. Using auxin mutants, axr1-3 and aux1-100, we show that a plant auxin pathway plays a major role in inhibiting root growth but not in promoting root hair elongation, indicating that root developmental responses involve several distinct pathways. Finally, using a split root device, we demonstrate that root colonization by M. loti, as well as by the bona fide plant growth promoting rhizobacteria Azospirillum brasilense and Pseudomonas, affect root development via local transduction pathways restricted to the colonised regions of the root system.
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Affiliation(s)
- A Poitout
- LSTM, Univ. Montpellier, IRD, CIRAD, Montpellier SupAgro, Montpellier, France
| | - A Martinière
- BPMP, Univ. Montpellier, INRA, CNRS, Montpellier SupAgro, Montpellier, France
| | - B Kucharczyk
- LSTM, Univ. Montpellier, IRD, CIRAD, Montpellier SupAgro, Montpellier, France
| | - N Queruel
- LSTM, Univ. Montpellier, IRD, CIRAD, Montpellier SupAgro, Montpellier, France
| | - J Silva-Andia
- LSTM, Univ. Montpellier, IRD, CIRAD, Montpellier SupAgro, Montpellier, France
| | - S Mashkoor
- BPMP, Univ. Montpellier, INRA, CNRS, Montpellier SupAgro, Montpellier, France
| | - L Gamet
- LSTM, Univ. Montpellier, IRD, CIRAD, Montpellier SupAgro, Montpellier, France
| | - F Varoquaux
- LSTM, Univ. Montpellier, IRD, CIRAD, Montpellier SupAgro, Montpellier, France
| | - N Paris
- BPMP, Univ. Montpellier, INRA, CNRS, Montpellier SupAgro, Montpellier, France
| | - H Sentenac
- BPMP, Univ. Montpellier, INRA, CNRS, Montpellier SupAgro, Montpellier, France
| | - B Touraine
- LSTM, Univ. Montpellier, IRD, CIRAD, Montpellier SupAgro, Montpellier, France
| | - G Desbrosses
- LSTM, Univ. Montpellier, IRD, CIRAD, Montpellier SupAgro, Montpellier, France
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Arenas-Mena C, Raynal M, Borrell A, Varoquaux F, Cutanda MC, Stacy RA, Pagès M, Delseny M, Culiáñez-Macià FA. Expression and cellular localization of Atrab28 during arabidopsis embryogenesis. Plant Mol Biol 1999; 40:355-363. [PMID: 10412913 DOI: 10.1023/a:1006219315562] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The maize abscisic acid (ABA)-responsive gene rab28 has been shown to be ABA-inducible in embryos and vegetative tissues, expression being mostly restricted to vascular elements during late embryogenesis. In the course of an expressed sequence tags (ESTs) programme, we have isolated an Arabidopsis thaliana gene, Atrab28, encoding the orthologue of maize rab28. The Atrab28 cDNA is 1090 bp long, including a poly(A)+ stretch, and encodes a polypeptide of 262 amino acids. Atrab28 antibody against the recombinant protein recognizes a polipeptide of about 30 kDa and pI 6, in close agreement with the predicted molecular mass and pI. As for maize rab28, expression studies with Atrab28 revealed high specificity for embryo tissues, transcription being stimulated by the transcriptional activator abi3. In contrast, Atrab28 was not induced in vegetative tissues by ABA, osmotic stress or dehydration. The expression of Atrab28 mRNA and the accumulation of Atrab28 protein was largely restricted to provascular tissues of mature embryos and in the seed coat outer tegument and embryo and silique epidermis, as revealed by in situ hybridization and immunocytochemistry with anti-Atrab28 antibodies.
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Affiliation(s)
- C Arenas-Mena
- Departament de Genètica Molecular, Centre d'Investigació i Desenvolupament, C.S.I.C., Barcelona, Spain
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Camilleri C, Lafleuriel J, Macadré C, Varoquaux F, Parmentier Y, Picard G, Caboche M, Bouchez D. A YAC contig map of Arabidopsis thaliana chromosome 3. Plant J 1998; 14:633-642. [PMID: 9675906 DOI: 10.1046/j.1365-313x.1998.00159.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We have constructed a YAC contig map of Arabidopsis thaliana chromosome 3. From an estimated total size of 25 Mb, about 21 Mb were covered by 148 clones arranged into nine YAC contigs, which represented most of the low-copy regions of the chromosome. YAC clones were anchored with 259 molecular markers, including 111 for which linkage information was previously available. Most of the genetic map was included in the YAC coverage, and more than 60% of the genetic markers from the reference recombinant inbred line map were anchored, giving a high level of integration between the genetic and physical maps. The submetacentric structure of the chromosome was confirmed by physical data; 3R (the top arm of the linkage map) was about 12 Mb, and 3L (the bottom arm of the linkage map) was about 9 Mb. This YAC physical map will aid in chromosome walking experiments and provide a framework for large-scale DNA sequencing of chromosome 3.
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Affiliation(s)
- C Camilleri
- Laboratoire de Biologie Cellulaire, INRA, Versailles, France
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Delseny M, Raynal M, Laudié M, Varoquaux F, Comella P, Wu HJ, Cooke R, Grellet F. Sequencing and mapping the Arabidopsis genome: a weed model for real crops. Symp Soc Exp Biol 1996; 50:5-9. [PMID: 9039428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Arabidopsis is a crucifer weed with a small genome of about 120 Mbp which has been chosen as a model species for plant molecular genetics. Four years ago, a consortium of nine French laboratories, including ours, initiated a project aimed at mapping the transcribed regions of the genome. The strategy employed was to systematically and randomly sequence cDNA clones isolated from libraries made from different tissues and organs of plants grown under various physiological conditions. The consortium released about 7,000 expressed sequenced tags (ESTs) in the dbEST database corresponding to approximately 3,500 unique genes. In the next phase of the programme, a YAC library with average inserts of 500 kbp has been prepared. We have now started to use the EST information to map the cDNA clones on these YACs. The most recent aspect of Arabidopsis sequencing is the ESSA (European Scientists Sequencing Arabidopsis) project, in which the aim is to describe 2.5 Mbp by the end of 1996. Genomic sequencing has revealed a very high gene density. Comparison of present genomic sequencing results with the EST data suggests that up to half of the genes might already be tagged with an EST. In collaboration with Carlos Quiros' group in Davis we have also analysed the conservation of a 30 kbp locus (Em 1, a late embryogenesis abundant protein gene) on chromosome 3 between Arabidopsis and several Brassica species. Progress on these various aspects will be reviewed. We shall also present some sequence comparisons between Arabidopsis and rice ESTs. These results suggest that it should be possible in the very near future to map a pool of common genes onto many different plant genomes. This should provide a common framework to integrate maps from different species and facilitate mapbased cloning of genes of agronomical importance.
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Affiliation(s)
- M Delseny
- Physiologie et Biologie Moléculaire des Plantes, CNRS Unite 565, University of Perpignan, France
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