**Acknowledgements**

The work was supported by Russian Foundation for Basic Research (grant # 16‐34‐60132 for O.A. Kulaeva), by grant of the President of the Russian Federation (project NSh‐6759.2016.4 for A.M. Afonin), by Russian Science Foundation (grant # 14‐24‐00135 for I.A. Tikhonovich and grant # 16‐16‐00118 for A.I. Zhernakov and V.A. Zhukov). The authors thank Dr A.P. Yurkov (ARRIAM, St. Petersburg, Russia) for providing the *Medicago lupulina* L. MlS‐1 line and A.S. Sulima (ARRIAM, St. Petersburg, Russia) for critical reading of the manuscript.

[7] Sprent JI, Nodulation in legumes. Royal Botanic Gardens. Kew: Royal Botanic Gardens;

Transcriptomic Studies in Non-Model Plants: Case of *Pisum sativum* L. and *Medicago lupulina* L.

http://dx.doi.org/10.5772/intechopen.69057

239

[8] Provorov N, Tikhonovich I. Genetic resources for improving nitrogen fixation in legume‐rhizobia symbiosis. Genetic Resources and Crop Evolution. 2003;**50**:89‐99. DOI:

[10] Elvira‐Recuenco M, Van Vuurde J. Natural incidence of endophytic bacteria in pea culti‐ vars under field conditions. Canadian Journal of Microbiology. 2000;**46**:1036‐1041

[11] Mishra PK, Mishra S, Selvakumar G, Bisht J, Kundu S, Gupta HS. Coinoculation of Bacillus thuringeinsis‐KR1 with Rhizobium leguminosarum enhances plant growth and nodulation of pea (*Pisum sativum* L.) and lentil (*Lens culinaris* L.). World Journal of

Microbiology and Biotechnology. 2009;**25**:753‐761. DOI: 10.1186/1471‐2164‐8‐427

[12] Barker DG, Bianchi S, Blondon F, Dattée Y, Duc G, Essad S, et al. *Medicago truncatula*, a model plant for studying the molecular genetics of theRhizobium‐legume symbiosis.

[13] Cook DR. *Medicago truncatula*—a model in the making!: Commentary. Current Opinion

[14] Stougaard J. Genetics and genomics of root symbiosis. Current Opinion in Plant Biology.

[15] Young ND, Cannon SB, Sato S, Kim D, Cook DR, Town CD, et al. Sequencing the gene‐ spaces of *Medicago truncatula* and *Lotus japonicus.* Plant Physiology. 2005;**137**:1174‐1181.

[16] Benedito VA, Torres‐Jerez I, Murray JD, Andriankaja A, Allen S, Kakar K, et al. A gene expres‐ sion atlas of the model legume *Medicago truncatula.* The Plant Journal. 2008;**55**:504‐513.

[17] He J, Benedito VA, Wang M, Murray JD, Zhao PX, Tang Y, et al. The *Medicago trun‐ catula* gene expression atlas web server. BMC Bioinformatics. 2009;**10**:441. DOI:

[18] Krishnakumar V, Kim M, Rosen BD, Karamycheva S, Bidwell SL, Tang H, et al. MTGD: The *Medicago truncatula* genome database. Plant and Cell Physiology. 2014;**56**:pcu179.

[19] Mun T, Bachmann A, Gupta V, Stougaard J, Andersen SU. Lotus base: An integrated information portal for the model legume *Lotus japonicus.* Scientific Reports. 2016;**6**:39447.

[20] Schmutz J, Cannon SB, Schlueter J, Ma J, Mitros T, Nelson W, et al. Genome sequence of the palaeopolyploid soybean. Nature. 2010;**463**:178‐183. DOI: 10.1038/nature08670

[9] Smith SE, Read DJ. Mycorrhizal symbiosis. Academic press; 2008

Plant Molecular Biology Reporter. 1990;**8**:40‐49

in Plant Biology. 1999;**2**:301‐304

DOI: 10.1104/pp.104.057034

10.1186/1471‐2105‐10‐441

DOI: 10.1093/pcp/pcu179

DOI: 10.1038/srep39447

DOI: 10.1111/j.1365‐313X.2008.03519.x

2001;**4**:328‐335

2001.

10.1023/A:1022957429160
