ORIGINAL ARTICLE
Plant growth promoting rhizobacteria and Rhizophagus irregularis: biocontrol of rice blast in wild type and mycorrhiza-defective mutant
 
 
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Plant Disease Research Department, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Teheran, Iran
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
CORRESPONDING AUTHOR
Samira Peighami Ashnaei   

Plant Disease Research Department, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Teheran, Iran
Online publish date: 2019-10-11
Submission date: 2018-11-18
Acceptance date: 2019-08-29
 
Journal of Plant Protection Research 2019;59(3):362–375
KEYWORDS
TOPICS
ABSTRACT
Rice blast is one of the most destructive rice diseases known to cause considerable yield losses globally. Plant growth promoting rhizobacteria (PGPR) and arbuscular mycorrhizal fungi (AMF) are closely associated with rice plants and improve plant growth and health. To determine how isolated bacteria trigger rice growth, an assessment of phosphate solubilization and auxin production mechanisms was carried out in vitro and in vivo. In this study, the interactions between PGPR and Rhizophagus irregularis were evaluated in wildtype and CYCLOPS mutant plants to provide a sustainable solution against blast disease and reduce the amount of yield loss. Importantly, Bacillus subtilis UTSP40 and Pseudomonas fluorescens UTSP50 exhibited a suppressive effect on AMF colonization which shows the probable existence of a functional competition between AMF and PGPR to dominate the rhizosphere. On the other hand, R. irregularis decreased the biocontrol activity of B. subtilis UTSP40 in wild type, although this reduction was not significant in mutant plants. Results showed that the same defense-related genes were induced in the roots of wild type colonized by B. subtilis UTSP40 and R. irregularis. Therefore, plant cell programs may be shared during root colonization by these two groups of beneficial microorganisms.
ACKNOWLEDGEMENTS
The author has the Ministry of Science, Research and Technology of Iran, University of Lausanne (UNIL, Switzerland) and Dr. Uta Paszkowski to thank for providing the necessary funds and facilities to carry out the experiments.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
 
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