Identification and pathogenicity of phytopathogenic bacteria associated with soft rot disease of girasole tuber in Egypt

Ismail, Mamdoh Ewis; Abdel-Monaim, Montaser Fawzy; Mostafa, Yasser M.

doi:10.5897/jbr11.015

J. Bacteriol. Res.

2012

DOI: 10.5897/jbr11.015

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Identification and pathogenicity of phytopathogenic bacteria associated with soft rot disease of girasole tuber in Egypt

Mamdoh Ewis Ismail¹,

Montaser Fawzy Abdel-Monaim²,

Yasser M. Mostafa³

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“…To demonstrate the ability of the bacterial isolates to cause tuber soft rot on potato tuber slices and blackleg symptoms on potato plant, we performed pathogenicity tests as described by Naqqash et al (2016) and Ismail and Mostafa (2012). Certified seed tubers (shangi) obtained from International Potato Center (CIP), Kenya, were sterilized with 70% alcohol, rinsed with sterile distilled water and aseptically cut into 1 cm thick slices.…”

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Occurence of pectinolytic bacteria causing blackleg and soft rot of potato in Kenya

et al. 2019

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Potato (Solanum tuberosum) is the second most important crop after maize in Kenya and plays a major role in national food production and security. Despite its importance, production is constrained by a number of factors, including diseases. Diseases caused by bacteria are a major biotic production constraint. Soft rot and blackleg diseases are considered as important constraints causing considerable losses in many production systems. However, there is scanty information on soft rot and blackleg in potato production systems in Kenya. A limited survey was conducted between in four major potato growing regions to determine the identity of pectinolytic bacteria causing blackleg and soft rot disease of potato in Kenya. Tubers and stems with symptoms of blackleg and soft rot disease were collected from 91 randomly selected farms. Identification of the pathogens was done using phenotypic methods which involved culturing on semi-selective medium, biochemical tests, pathogenicity tests and DNA based methods. The results identified occurrence of Pectobacterium carotovorum subsp. carotovorum (6 isolates) in all four regions and Pectobacterium wasabiae (5 isolates) for the first time in Elgeiyo Marakwet. The identity of twelve isolates could not be specified and therefore needs further investigation.

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Occurence of pectinolytic bacteria causing blackleg and soft rot of potato in Kenya

et al. 2019

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Use ofCymbopogon citratusessential oil in food preservation: Recent advances and future perspectives

Ekpenyong

Akpan

2017

Critical Reviews in Food Science and Nutrition

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The economic burdens and health implications of food spoilage are increasing. Contamination of food sources by fungi, bacteria, yeast, nematodes, insects, and rodents remains a major public health concern. Research has focused on developing safer natural products and innovations to meet consumers' acceptance as alternatives to synthetic food preservatives. Many recent novel preservative techniques and applications of both natural and synthetic origin continue to proliferate in food and chemical industries. In particular, some essential oils of plant origin are potent food preservatives and are thus attractive alternatives to synthetic preservatives. This paper provides an overview of recent advances and future prospects in assessing the efficacy of the use of Cymbopogon citratus (lemongrass) essential oil in food preservation. The possible mechanisms of action and toxicological profile as well as evidence for or against the use of this essential oil as an alternative to synthetic food preservatives in domestic and industrial applications are discussed.

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Classification and Taxonomy of Vegetable Macergens

Aremu

Babalola

2015

Front. Microbiol.

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Macergens are bacteria capable of releasing pectic enzymes (pectolytic bacteria). These enzymatic actions result in the separation of plant tissues leading to total plant destruction. This can be attributed to soft rot diseases in vegetables. These macergens primarily belong to the genus Erwinia and to a range of opportunistic pathogens namely: the Xanthomonas spp., Pseudomonas spp., Clostridium spp., Cytophaga spp., and Bacillus spp. They consist of taxa that displayed considerable heterogeneity and intermingled with members of other genera belonging to the Enterobacteriaceae. They have been classified based on phenotypic, chemotaxonomic and genotypic which obviously not necessary in the taxonomy of all bacterial genera for defining bacterial species and describing new ones These taxonomic markers have been used traditionally as a simple technique for identification of bacterial isolates. The most important fields of taxonomy are supposed to be based on clear, reliable and worldwide applicable criteria. Hence, this review clarifies the taxonomy of the macergens to the species level and revealed that their taxonomy is beyond complete. For discovery of additional species, further research with the use modern molecular methods like phylogenomics need to be done. This can precisely define classification of macergens resulting in occasional, but significant changes in previous taxonomic schemes of these macergens.

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Identification and pathogenicity of phytopathogenic bacteria associated with soft rot disease of girasole tuber in Egypt

Cited by 3 publications

References 0 publications

Occurence of pectinolytic bacteria causing blackleg and soft rot of potato in Kenya

Occurence of pectinolytic bacteria causing blackleg and soft rot of potato in Kenya

Use ofCymbopogon citratusessential oil in food preservation: Recent advances and future perspectives

Classification and Taxonomy of Vegetable Macergens

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