Maryam Khezri,
Volume 5, Issue 2 (8-2016)
Abstract
Khezri M. 2016. Biofilm formation in probiotic bacterium Bacillus subtilis. Plant Pathology Science 5(2):52-62.
Most bacteria have a common ability to form communities known as biofilm. They are varied in structure and function, but have some similarities in general properties. The main compounds of biofilms are extracellular polysaccharides. The probiotic Bacillus subtilis is a gram-positive, rod-shape, endospore-forming and soil inhabiting bacterium that has many agricultural use, such as plant growth promoting activity and biocontrol potential against many of phytopathogens. Biofilm formation is an important microbial survival strategy that enables microorganisms to stay together for long time. Biofilm can protect the bacteria against unfavorable conditions, like antibiotics, chemical pesticides and biocide components. Capability of biofilm formation in probiotic B. subtilis plays significant role in root colonization and biological control of plant pathogens.
Maryam Khezri, Simin Allahyari Igdir, Zahra Aghazadeh Soureh,
Volume 10, Issue 1 ((Autumn & Winter) 2021)
Abstract
Khezri M, Allahyari Igdir S, Aghazadeh Soureh Z (2021) Tomato bacterial diseases in West Azerbaijan province of Iran. Plant Pathology Science 10(1):86-96. Doi: 10.2982/PPS.10.1.86.
Introduction: Tomato is one of the most important and most widely consumed vegetable in the world. Tomato also is one of the most important products in West Azerbaijan Province of Iran, which plays an important role in the province's agricultural economy. Accurate bacterial disease diagnosis is the first and most important step in designation methods of disease management. Materials and Methods: Tomato farms in the suburbs of the province cities were visited and diseased plants were sampled. Bacteria were isolated and purified from patient tissues and identified based on phenotypic and molecular characteristics. The bacterial pathogenicity test was performed according to Koch principles. Results: Tomato bacterial pathogens in this province include Clavibacter michiganensis subsp. michiganensis, Xanthomonas vesicatoria, Pseudomonas syringae pv. tomato, P. syringae pv. syringae and Dickya chrysanthemi, agents of bacterial canker, bacterial spot, bacterial speck, syringe leaf spot and soft stem rot. Disease symptoms, phenotypic and molecular properties of pathogenic bacteria, previous reports on these bacteria from Iran and their distribution in different regions of West Azerbaijan Province are presented. Conclusion: These bacteria, with the exception of the tomato bacterial canker agent, are reported for the first time from West Azerbaijan province.
Kayvan Farri, Maryam Khezri,
Volume 10, Issue 2 ((Spring and Summer) 2021)
Abstract
Farri K, Khezri M (2021) Integrate management method of plants crown gall disease. Plant Pathology Science 10(2):116-127.
Doi: 10.2982/PPS.10.2.116.
Agrobacterium tumefaciens is capable of causing distractive disease of crown gall in a wide range of dicotyledonous plants and causes great economic impact in its hosts. This soil-dwelling bacterium can survive as a saprophyte in soil and plant debris for a long time. When the host plant is present, the bacterium is absorbed into the plant through the root secretions from the wounds and enters the plant through it. The pathogenic bacteria introduce a part of its Ti plasmid, called T-DNA, into the plant cell. Integration of the T-DNA to plant cell genome results in expression of the encoded oncogenes and an increasing the production of phytohormones in cells. Overproduction of auxin and cytokinin leads to cells hyperplasia and hypertrophy, which results in the gall formation on the root, crown, and branches of infected plants. As regards the wide host range, high economic impact, and difficult control of this disease, in this article phenotypic, genetic and pathogenicity characteristics of bacteria have been studied, as well as biology and effective strategies of integrated disease management are presented.
Maryam Khezri, Mahmoud Reza Karimi Shahri, Abolghasem Ghasem,
Volume 12, Issue 1 ((Autumn & Winter) 2023)
Abstract
Khezri, M., Karimi Shahri, M. R., & Ghasemi, A. (2023). Bacterial rot disease of saffron corm and leaf. Plant Pathology Science, 12(1), 74-83.
Saffron is one of the valuable agricultural products and its dried stigma is used as medicine and is known as a precious spice. Infection of the plant's reproductive organs plays an important role in the spread of pathogens. The saffron is reproduced via corms, and using healthy and pathogen-free corms is the best and most effective strategy to prevent the spread of soil-borne pathogens in new areas and fields. Saffron corm rot disease is caused by some fungal and bacterial pathogens. Burkholderia gladioli pv. gladioli is the causal agent of saffron leaf and corm rot disease. The bacterium survives in the soil for a long time, and it is transmitted through the infected soil, farming tools, and corms. In recent years, this disease has been reported from Khorasan Razavi province. In this article, along with introducing the bacterial disease of saffron leaves and corms rotting, strategies to prevent the occurrence and spread of the disease have been presented.
