Auxin was first isolated and characterized as plant growth, and indole-3-acetic acid
(IAA) is a type of auxin [6.7]. Most of the genus Trichoderma produce auxin indole acetic acid
(IAA), with or without precursor L-tryptophan [8]. Trichoderma isolated from rhizospher were
more efficient in producing IAA compared T. asperellum T211 [9]. Deshwal et al. [10.11],
observed that IAA produced by Pseudomonas aeruginosa MR-9 increases plant height, dry
weight, number of nodules per plant, nodule fresh weight of Mucuna pruriens as many as 184,
124, 139, 180% compared with controls.