Effect of Combined Inoculation of Xanthomonas and Meloidogyne Pathogens on the Development of Tomato Root Knot Disease

M. R. Arain
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Abstract

Bacteria (Xanthomonas campestris pv. vesicatoria) and root-knot nematode (Meloidogyne incognita) independently can damage and cause considerable damage to tomato (Solanum lycopersicum L.). In a disease complex, interrelationship of 2 or more pathogenic species can produce different symptoms on the same host plant. Generally simultaneous occurrence of these pathogens in a field can infect hosts plant at the same time. During development of a disease complex pathogens could influence and/or suppress each other, through synergism and or antagonism respectively. In this study the pathogens (Meloidogyne incognita and Xanthomonas campestris pv. vesicatoria), were used to determine how co-occurrence affects development of pathogens and disease severity, and define prerequisites for interrelation between pathogens. Root knot infection did not occur when tomato plants were inoculated with Xanthomonas campestris 1 week prior to inoculation with Meloidogyne incognita. When M. incognita was inoculated 1 week prior to X. campestris, infection by root knot nematode was highest compared to bacterial spot incidence in susceptible plants. Simultaneous inoculation of M. incognita + X. campestris caused severe gall production with moderate severity of bacterial spot disease. The reproduction of 1 pathogen can be affected by a subsequent inoculation of other pathogen. It is suggested that bacterial spot disease enhances the development of root knot disease.
黄单胞菌与根结菌联合接种对番茄根结病发生的影响
细菌(桔黄色单胞菌pv。根结线虫(Meloidogyne incognita)分别对番茄(Solanum lycopersicum L.)造成危害和相当大的危害。在疾病复合体中,两种或两种以上致病物种的相互关系可能在同一寄主植物上产生不同的症状。一般情况下,这些病原菌在田间同时发生时,可同时感染寄主植物。在疾病的发展过程中,复杂的病原体可以分别通过协同作用和/或拮抗作用相互影响和/或抑制。本研究的病原菌分别为:绿芽胞菌(meloidogyita)和油菜黄单胞菌(Xanthomonas campestris pv)。Vesicatoria),用于确定共发生如何影响病原体的发展和疾病的严重程度,并确定病原体之间相互关系的先决条件。接种番茄黄单胞菌1周后,未发生根结感染。在易感植物中,当接种绿僵菌1周之前,根结线虫侵染率最高。同时接种不知名M. incognita + campestris引起了严重的胆汁生成和中度细菌性斑疹病。一种病原体的繁殖可能受到随后接种其他病原体的影响。提示细菌性斑疹病促进了根结病的发生。
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