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• 作者：Saeidreza Azarabadi ; Hamid Abdollahi ; Mohamad Torabi…
• 关键词：Pear (Pyrus communis L.) ; ROS ; scavenging enzymatic genes ; Fire blight ; Erwinia amylovora ; ROS generation ; Gene expression
• 刊名：European Journal of Plant Pathology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：147
• 期：2
• 页码：279-294
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Plant Pathology; Plant Sciences; Ecology; Agriculture; Life Sciences, general;
• 出版者：Springer Netherlands
• ISSN：1573-8469
• 卷排序：147

文摘

Here, the intensity and ratio of superoxide anion (O₂•), hydrogen peroxide (H₂O₂) and hydroxyl anion (OH•-) formation along the in vitro shootlets of four pear (Pyrus communis L.) rootstocks (i.e., Pyrodwarf, OH × F40, OH × F69 and OH × F333) were scrutinized under E. amylovora inoculation, over 144 hpi. Furthermore, following identifying the most tolerant and susceptible pear rootstocks (i.e., OH × F69 and OH × F40, respectively), the dynamic expression profiles of three ROS-scavenging enzymatic genes including superoxide dismutase (SOD), Catalase (CAT) and ascorbate peroxidase (APX) were elucidated in response to E. amylovora, over 96 hpi. The highest disease tolerance was observed in OH × F69, and OH × F333, Pyrodwarf and OH × F40 occupied the next descending positions, respectively. Furthermore, the O₂•- generation rates were almost similar in all the pears studied, though the accumulation of H₂O₂ and OH•- and intensities thereof were considerably distinctive and significantly followed up the levels of disease resistance. Comparing to the controls (0 hpi), in both susceptible and tolerant pear rootstocks, transcription activity of SOD, CAT, and APX genes were overall stimulated with relatively high abundance over 24, 48, 72 and 96 hpi, though some fluctuations were also recorded. Our ROS results, altogether, indicated that E. amylovora is capable enough to stimulate ROS formation in pear, though its progress is extremely dependent upon the susceptibility ratio of the plant. Lastly, the particular expression patterns and different response time of three genes designated that pear rootstocks differentially activates genes encoding antioxidant enzymes to mitigate the possible damage of ROS during E. amylovora invasion.