TABLE 1.

Examples of AM fungi-rhizobia mediated stress tolerance in legume plants*.

Stress	Microorganism	Plant species	Inference	References
Heat shock and osmotic stress	Glomus intraradices	AM extraradical hyphae in in vitro system	Increase trehalose turnover rate	Ocón et al. (2007)
Drought	Septoglomus constrictum, Glomus sp., and Glomus aggregatum	Glycine max	Improved water content and P and N concentrations	Grümberg et al. (2015)
Drought	Glomus intraradices and native rhizobial strains	Genotypes of Phaseolus vulgaris	Showed positive correlation between mycorrhizal colonization and nodule trehalose content	Ballesteros-Almanza et al. (2010)
Drought	Trehalose	Acacia senegal, Sinorhizobium symbiosis	Protected cell cultures of the Sinorhizobium strains and increased EPS	Räsänen et al. (2004)
Osmotic stress	Glomus intraradices BEG 123	Phaseolus vulgaris	Enhanced osmotic root hydraulic conductance in roots through active solute transport	Aroca et al. (2007)
Salt	Glomus etunicatum	Glycine max	Influenced proline concentrations	Sharifi et al. (2007)
Drought	Co-inoculation of Rhizobium tropici and Paenibacillus polymyxa	Phaseolus vulgaris	Upregulation of genes involved in stress tolerance	Figueiredo et al. (2008)
Salt	Glomus intraradices	Glycine max	Accumulation of carbohydrates	Porcel and Ruiz-Lozano (2004)
Salinity	Glomus intraradices BAFC 3108	Lotus glaber	Reduced sodium in root and shoots; enhanced root potassium	Sannazzaro et al. (2006)
Salinity	Glomus clarum	Vigna radiata		Rabie et al. (2005), Daei et al. (2009)
Salinity	Glomus intraradices BEG121	Lactuca sativa	Reduced concentration of ABA	Aroca et al. (2008)
Salt	Native rhizobia	Medicago truncatula and Phaseolus vulgaris	Enhanced trehalose	López et al. (2008)
Salt	Glomus mosseae	Cajanus cajan	Enhanced trehalose in nodules	Garg and Chandel (2011)
Salt	Funneliformis mosseae Rhizophagus irregulariae		Enhanced trehalose turnover in AM plants, nodulation and N-fixation	Garg and Pandey (2016)

*Modified from Meena et al. (2017).