Specific Host-Responsive Associations Between Medicago truncatula Accessions and Sinorhizobium Strains
Théophile Kazmierczak1, Marianna Nagymihály2,3, Florian Lamouche2
11 Institute of Plant Sciences Paris Saclay IPS2, CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Saclay, Bâtiment 630, 91405 Orsay, France. Institute of Plant Sciences Paris-Saclay IPS2, Université Paris Diderot, Sorbonne Paris-Cité, Bâtiment 630, 91405, Orsay, France.
Rhizobium strain selection impacts legume symbiosis efficiency. Sinorhizobium FSM-MA is highly effective, while Sm1021 shows weak performance due to impaired nodule cell differentiation in Medicago truncatula.
Area of Science:
- Plant-microbe interactions
- Molecular biology
- Agricultural science
Background:
- Legume-rhizobia symbiosis is crucial for nitrogen fixation.
- Host plant and bacterial genotypes influence symbiosis efficiency.
- Medicago truncatula is a model legume with variable Sinorhizobium interactions.
Purpose of the Study:
- Compare symbiotic efficiency of Sinorhizobium strains with M. truncatula accessions.
- Identify optimal rhizobia for specific M. truncatula genotypes.
- Investigate reasons for variable symbiotic efficiency.
Main Methods:
- Symbiotic efficiency assessment using multiple parameters.
- Comparison of Sinorhizobium meliloti strains (Sm1021, 102F34, FSM-MA) and Sinorhizobium medicae (WSM419).
- Evaluation on Medicago truncatula accessions A17 and R108.
Main Results:
- FSM-MA strain showed high effectiveness with both M. truncatula accessions.
- Specific efficient interactions: A17-WSM419 and R108-102F34.
- Sm1021 strain performed poorly, despite efficient nodule organogenesis, due to incomplete symbiotic cell differentiation.
Conclusions:
- Rhizobium strain and M. truncatula accession choice significantly affects nitrogen-fixation efficiency.
- Sm1021's limited effectiveness is linked to late-stage nodule development.
- Results guide selection of rhizobia for M. truncatula functional studies, especially those on nodulation.
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