The response of Vicia faba growth, pigmentation and secondary metabolites to plant growth-promoting bacteria

Document Type : Original Article

Authors

Botany Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt

Abstract

The use of plant growth promoting bacteria in agricultural application for various purposes is of great significance. In this study, three bacterial strains Pseudomonas MAP5, Bacillus lecheniformis and Bacillus aerius nominated for their ability to grow on naphthalene as a sole carbon source in addition to their potentiality as plant growth promotors. The treatment of Vicia faba seeds with Pseudomonas MAP5 resulted in 2.6 times higher shoot length (17.9 cm) compared to the control (13.3 cm, p = 0.0001). Treatments with Bacillus lecheniformis boosted chlorophyll (a) contents by 1.2 times (0.56 mg/g f. wt.) compared to the control (0.47 mg/g f. wt.) (p = 0.0001). Plant electrolyte leakage showed substantial reduction, specifically after Bacillus aerius treatment (16.71%) compared to control (28.17%, p = 0.0001). Additionally, the phenolic content increased notably in Rhizobium-treated plants, reaching (12.18 mg GAE/g d. wt.) above the control level (8.95 mg GAE/g d. wt., p < 0.0001), which indicates these bacterial strains potentially enhance plant growth and stress adaptation capability. The results represented in this study indicated the potentiality particularly of Bacillus lecheniformis as bean growth promotor and secondary metabolites modulator paving the way for their application for the bioremediation of polycyclic aromatic hydrocarbons.

Keywords

Mansoura Journal of Biology
Volume 72, Issue 2
June 2025
Pages 1-13

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