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Showing 2 results for hassanzadeh
Bacterial necroticand leaf spot diseaseof banana
Majid Amani, Nader Hassanzadeh, Saeid Rezaei,
Volume 1, Issue 1 (3-2012)
Abstract
In 2005, Circular to elliptical brown necrotic leaf spots, were observed on young leaves of Banana(Musa acuminata L.) plantion under plastic cover in Mazandaran&Gorgan provinces. The rhizomes and pseudostems were not affected. A gram-negativebacterium with yellow mucoid colonies was isolated from the leaves on sucrose and glucose nutrient agar. All isolates were negative in oxidas, and positive in catalase reaction. Non of isolates did not produce green or blue pigment on KB medium. On the basia of phenotypic charachteristics pathogenicity test was confirmed with inocoulation of bacterial suspension to Banana plants. The causal agent of bacterial necrotic and leaf spot of banana was recognized asXanthomonascampestris. This is the first report ofbacterial necrotic and leaf spot of banana in Iran.
Relative levels of resistance to bacterial canker in Iranian apricot hybrids
Roghayeh Mohammadi, Mansureh Keshavarzi, Nader Hassanzadeh, Jalil Dejampour, Afagh Farhadnezhad,
Volume 10, Issue 2 ((Spring and Summer) 2021)
Abstract
Mohammadi R, Keshavarzi M, Hassanzadeh N, Dejampour J, Farhadnejad A (2021) Relative resistance levels to bacterial canker in Iranian apricot hybrids. Plant Pathology Science 10(2):15-29.  Doi: 10.2982/PPS.10.2.15.
 
Introduction: Bacterial canker caused by Pseudomonas syringae is one of the most damaging diseases in apricots. This experiment was conducted to evaluate relative resistance to the disease in 22 selected local apricot hybrids including AD507, AD405, and HS731 which were recently released as Jalil, Parsi and Shanli. Material and Methods: Evaluation methods included artificial inoculation of two-year-old seedlings in an orchard and of cut shoots in the laboratory. Initially, the pathovar identity of localP. syringae strains were determined using LOPAT and GATTa tests and three isolates were used as inoculum. The inoculation was done in the seedling stem and after one year and 1.5 years, canker length was recorded. Result: The pathovar of all isolates was identified as P. syringae pv. syringae. The longest and shortest cankers were observed in AD1033 and AC113 with averages of 34.76 mm and 8.35 mm, respectively. The cut shoot bioassay was not practical for apricots. The hybrids were classified into four groups including highly resistant, resistant, moderately resistant, and susceptible. Conclusion: AD1033, AD1042, AD940, AD811, HS210, DM101, HS203 have been classified as susceptible and should not be used in breeding programs and orchard establishment/replacement. Jalil, Parsi, and Shanli were rated as resistant, and moderately resistant, respectively.

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