Abstract
The resistant phenotype of pear cultivars includes either complete resistance or tolerance to the attack by the causative agent of fire blight. The effect of ferritin and active iron (Fe2+) concentrations was compared in resistant (Dargazi), tolerant (Harrow Sweet), and susceptible (Bartlett) pear cultivars inoculated with a wild type strain of Erwinia amylovora (Ea273). The examination of necrosis revealed that resistance to the disease manifested itself as a delay in the appearance of symptoms and progression of the disease. Despite a rise in ferritin levels in all cultivars following disease agent inoculation, resistant and tolerant cultivars showed greater ferritin levels than susceptible cultivar. In addition, only resistant and tolerant cultivars displayed a drop in Fe2+ levels. The rate of decrease in Fe2+ content in Dargazi and Harrow sweet cultivars was 28 and 33%, respectively. Hydrogen peroxide (H2O2) and hydroxyl radical (OH•−) accumulation and intensities were considerably distinctive. Furthermore, tolerant and sensitive cultivars started producing OH•− radicals faster than resistant cultivar. According to these findings, different pathways are employed by pear cultivars to respond to the causative agent of fire blight.
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We thank Faezeh Ghanati and Zeinab Salehi for their technical assistance.
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Maleki, R., Abdollahi, H. & Piri, S. Variation of active iron and ferritin content in pear cultivars with different levels of pathogen resistance following inoculation with Erwinia amylovora. J Plant Pathol 104, 281–293 (2022). https://doi.org/10.1007/s42161-021-00998-9
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DOI: https://doi.org/10.1007/s42161-021-00998-9