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Ecology and etiology of bacterial top rot in maize caused by Klebsiella pneumoniae KpC4

机译：玉米细菌顶部腐烂的生态学和病因，玉米肺炎肺炎昆明KPC4

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Klebsiella pneumoniae is an important opportunistic pathogen in humans and animals. Recently, K. pneumoniae KpC4 was identified as a causative agent of bacterial top rot in maize, which has been observed in many areas of Yunnan province, China. KpC4 is potentially dangerous to humans and livestock due to its cross-kingdom infection ability. Our study revealed the disease cycle of maize bacterial top rot caused by KpC4 and the ecological adaptability and host range of KpC4. We found same pathogenicity in maize between KpC4, the environmental strains E1, E4 (K1 serotype), E5, and the clinical strain K. pneumoniae 138 (Kp138). Alternative hosts of K. pneumoniae include not only humans and animals but also a variety of plants (such as maize, banana and sorghum). One of the survival strategies of K. pneumoniae is ecological adaptability, which is an essential factor for KpC4 to be able to cause bacterial top rot in maize. K. pneumoniae, for example, could survive in large numbers (2.34 +/- 0.22 x 10(3) cfu/g) not only in the maize leaves (2.34 +/- 0.22 x 10(3) cfu/g) under natural light, but persist in dried maize plant debris (1.51 x 104 cfu/g) for at least 6 months. K. pneumoniae strains from different sources can generally induce infection in susceptible hosts. Thus, this study revealed the ecological basis of KpC4 cross-kingdom infections, laying the foundation for the study of the mechanisms underlying cross-kingdom infections involving this type of human/animal opportunistic pathogen.
机译：Klebsiella肺炎是人类和动物的重要机会主义病原体。最近，K.Pneumoniae KPC4被鉴定为玉米的细菌顶部腐烂的致病剂，在云南省的许多地区都观察到。由于其交叉王国感染能力，KPC4对人类和牲畜潜在危险。我们的研究表明，玉米细菌顶部腐烂的疾病循环由KPC4引起的和KPC4的生态适应性和宿主范围。我们在KPC4之间的玉米中发现了相同的致病性，环境菌株E1，E4（K1血清型），E5和临床菌株K.Pneumoniae 138（KP138）。 K.肺炎的替代宿主不仅包括人类和动物，还包括各种植物（如玉米，香蕉和高粱）。 K.Pneumoniae的存活策略之一是生态适应性，这是KPC4能够在玉米中引起细菌顶部腐烂的必要因素。 K.肺炎，例如，肺炎可以在大量（2.34 +/- 0.22 x 10（3）Cfu / g）中生存（2.34 +/- 0.22×10（3）Cfu / g）在自然下光，但持续在干玉米植物碎片（1.51 x 104 cfu / g）至少6个月。 K.来自不同来源的肺炎菌株通常可以在易感宿主中诱导感染。因此，本研究揭示了KPC4跨王国感染的生态基础，奠定了涉及这种人类/动物机会理性病原体的跨王王国感染机制的基础。

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