Abstract
Some biofertilizers agents i.e. Rhizobium leguminosarum var. fabae, Bacillus megaterium var., phosphaticum and Trichoderma harizianum play important roles in enhancing the plant growth and controlling several diseases i. e. root rot and stem canker disease. In this work, under greenhouse conditions, Rhizoctonia solani caused dampingoff and death of all faba bean seedlings, however the three tested microorganisms resulted good biocontol role against the pathogenic fungus and the application of T. harizianum gave the best result in this trend. The treatment of T. harizianum and R. leguminosarum var. fabae to the soil infested with Rhizoctonia solani showed significant increase in leaves number of faba bean plants compared with the untreated plants or which treated plants or which treated with Bacillus megaterium var., phosphaticum after 40 days from planting. Application of T. harizianum and R. leguminosarum var. fabae gave the best plant growth while the presence of the pathogenic fungus showed significant decrease in fresh weight, dry weight and nodules number on roots of faba bean plants. Also, polyphenols and antioxidants contents in the shoots and roots were decreased in the presence of the pathogen compared with the untreated plants. Application of R. leguminosarum resulted significant increase in the roots and shoots total nitrogen and protein.
Highlights
Since the early 1990s, induction of systemic resistance by plant growth promoting rhizobacteria (PGPR) has been investigated as a possible practical way to use induced resistance in agriculture
Marleny et al [4] found that plant growth promoting rhizobacteria (PGPR) are beneficial bacteria that colonize the rhizosphere and plant roots resulting in enhancement of plant growth or protection against certain plant pathogens
The same table showed that average number of nodules significantly decreased in response to the soil infested with R. solani even in the presence of biocontrol agent(s)
Summary
Since the early 1990s, induction of systemic resistance by plant growth promoting rhizobacteria (PGPR) has been investigated as a possible practical way to use induced resistance in agriculture. The use of plant growth promoting rhizobacteria (PGPR) isolated from cauliflower root, Pseudomonas fluorescens SP007s as biocontrol agent in protecting various plants from several diseases caused by bacteria and fungi have been reported for multiple studies [3]. Marleny et al [4] found that plant growth promoting rhizobacteria (PGPR) are beneficial bacteria that colonize the rhizosphere and plant roots resulting in enhancement of plant growth or protection against certain plant pathogens. Nelsson [9] reported that Trichoderma spp., are specific biocontrol agents against fungal pathogens (from Pythium to Rhizoctonia) according to the type of antibiotic produced. Zheng and Sinclair [11]
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