Evaluation of Combinatorial Capacity of Coconut and Cocoa Plant Growth Promoting Rhizobacteria (PGPR) with Biocontrol Agent Trichoderma harzianum
Journal Title: Current Investigations in Agriculture and Current Research - Year 2018, Vol 3, Issue 4
Abstract
Combining PGPR and biocontrol agents that are compatible with each other is a strategic approach to enhance plant growth and development, control plant diseases and pests. A screening study was carried out to evaluate the compatibility of eight PGPR isolated from the rhizosphere and endorhizosphere of coconut (Pseudomonas putida KnSF208, Bacillus licheniformis RSB14, Bacillus megaterium TEB2, Bacillus megaterium TSB16) and cocoa (Bacillus cereus ASB3, Bacillus subtilis VEB4, Bacillus licheniformis KGEB16, Pseudomonas putida KDSF23) with fungal antagonist, Trichoderma harzianum, under in vitro conditions. The Trichoderma harzianum was isolated from the rhizosphere of coconut. All the PGPR isolates were tested for compatibility with Trichoderma harzianum by dual culture technique on four different media. Among the coconut PGPR isolates tested, Bacillus megaterium TSB16 was found to be compatible with Trichoderma harzianum on nutrient agar and King’s B agar. However, none of the cocoa PGPR were compatible with Trichoderma harzianum on all the media tested. This study indicates that combined application of PGPR Bacillus megaterium TSB16 and Trichoderma harzianum, as bioinoculants, is possible for dual benefits of enhanced plant growth and soilborne pathogen suppressionBeneficial rhizosphere organisms are generally classified into two broad groups based on their primary beneficial effect on plant growth: (a) microorganisms with direct effects on plant growth promotion and (b) biological control agents that indirectly assist with plant productivity through the control of plant pathogens. Co-inoculation of plant growth promoting rhizobacteria (PGPR) and bio control agents (BCAs) is considered to be an innovative approach in plant-health management, and for the improvement of crop yield and quality. The use of formulated preparations, consisting of a single microbial species or strains as inoculants has often resulted in inconsistent performances in agriculture [1]. One of the reasons of such a failure could be that a single strain might not grow equally well in a variety of environmental conditions [2]. Thus, more emphasis was laid on the combined use of beneficial microorganisms as they will have the advantage of exercising a broad-spectrum activity, more stable rhizosphere community, enhancing the efficacy and reliability of biological control generally and ensuring greater induction of defense enzymes over individual strains [3].
Authors and Affiliations
Khadeejath Rajeela TH, Alka Gupta, Murali Gopal, Vinayaka Hegde, George V Thomas
Keywords
Related Articles
- EP ID EP571283
- DOI 10.32474/CIACR.2018.03.000168
- Views 79
- Downloads 0
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