Table 1.

Rhizobia and their ability in plant growth promotion (Modified from Ahmed and Kibert, 2014)

Rhizobia	Growth promoting substances produced	References
Rhizobium	Siderophores, P-solubilization, IAA, HCN	Abd-Alla (1994a, b), Antoun et al. (1998), Deshwal et al. (2003a), Duhan et al. (1998), Khan et al. (2002), Tank and Saraf (2010)
Rhizobium sp.	Growth hormones, IAA, siderophores, HCN, ammonia, exo-polysaccharides	Ahemad and Khan (2009a, 2010a, b, c, 2011a, b, c, 2012a), Joseph et al. (2007), Wani et al.(2007b), Zafar-ul-Hye et al. (2013)
R. phaseoli R. ciceri R. meliloti R. leguminosarum	IAA Siderophores Siderophores Cytokinin	Arora et al. (2001), Berraho et al. (1997), Noel et al. (1996), Prabha et al. (2013), Zahir et al. (2010)
Bradyrhizobium	Siderophores, IAA, HCN, P-solubilization	Abd-Alla (1994a), Antoun et al. (1998), Deshwal et al. (2003b), Duhan et al. (1998)
Bradyrhizobium sp.	IAA, HCN, ammonia, siderophores, exo-polysaccharides	Ahemad and Khan (2011c, d, e, 2012b), Khan et al. (2002), Wani et al. (2007a)
B. japonicum	IAA, Siderophores	Shaharoona et al. (2006), Wittenberg et al. (1996)
Mesorhizobium sp.	IAA, Siderophores, HCN, Ammonia, exo-polysaccharides, antifungal activity,	Ahemad and Khan (2009b, 2010d, e, 2012c), Ahmad et al. (2008), Khan et al. (2002), Wani et al. (2008a)
M. ciceri	IAA, Siderophores	Wani et al. (2007c)