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首页> 外文期刊>Journal of the Saudi Society of Agricultural Sciences >Pathogenic variability among five bacterial isolates of Xanthomonas campestris pv. vesicatoria, causing spot disease on tomato and their response to salicylic acid
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Pathogenic variability among five bacterial isolates of Xanthomonas campestris pv. vesicatoria, causing spot disease on tomato and their response to salicylic acid

机译：Xanthomonas campestris pv的五个细菌分离株之间的致病变异性。 vesicatoria，导致番茄上的斑病及其对水杨酸的反应

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Symptoms of a bacterial disease caused by Xanthomonas campestris pv. vesicatoria were observed on tomato plants growing in Al-Kharj area of Saudi Arabia. Symptoms included irregular yellow-necrotic areas on tomato leaves and spotting on the stem. Five bacterial isolates were isolated from the infected tomato seedlings. The pathogen identified was confirmed biochemically and physiologically, hypersensitive reaction occurred in tobacco plants and pathogenicity tests were conducted. Significant variability was shown among the bacterial isolates. Isolates T2, T4 and T5 were the most pathogenic isolates as expressed by the disease severity index. The highest severity index (57.8%) was observed by isolate T5, followed by the two isolates T4 (55.3%) and T2 (43.1%) two weeks post inoculation. In an attempt to control this disease, Salicylic acid was used to study its ability to inhibit the growth of X. campestris pv. vesicatoria in vitro, and its potentiality in suppressing bacterial spot of tomato under artificial inoculation conditions. All concentrations tested had inhibitory effects against X. campestris pv. vesicatoria. The inhibition zone increased with increasing concentrations. SA at 1.5ppm caused the largest inhibition zone (40mm) followed by 1ppm (33mm). Application of SA at 1.5ppm reduced the severity of bacterial leaf spot of tomato. Application as foliar treatment was more effective than seedling treatment. SA was the most effective at 1.5ppm as foliar treatment where the number of lesions/leaf and disease severity were 1.8 and 14.1, respectively.
机译：Xanthomonas campestris pv引起的细菌性疾病症状。在沙特阿拉伯Al-Kharj地区生长的番茄植株上观察到vesicatoria。症状包括番茄叶片上不规则的黄色坏死区域，茎上有斑点。从感染的番茄幼苗中分离出五种细菌分离株。通过生化和生理学方法确认鉴定出的病原体，在烟草植物中发生过敏反应，并进行了致病性测试。在细菌分离株之间显示出显着的变异性。如疾病严重性指数所示，分离株T2，T4和T5是最具致病性的分离株。接种后两周，分离株T5观察到最高严重性指数（57.8％），随后是两个分离株T4（55.3％）和T2（43.1％）。为了控制这种疾病，使用了水杨酸来研究其抑制野菜假单胞菌pv生长的能力。 vesicatoria体外，及其在人工接种条件下抑制番茄细菌斑的潜力。测试的所有浓度均对野油菜X.pv具有抑制作用。 vesicatoria。抑制区随浓度增加而增加。 1.5ppm的SA引起最大的抑制区（40mm），其次是1ppm（33mm）。以1.5ppm的比例施用SA可降低番茄细菌​​性叶斑病的严重程度。叶面处理比苗木处理更有效。当叶面处理量为1.5ppm时，SA最为有效，其中病灶/叶片的数量和疾病的严重程度分别为1.8和14.1。

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