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中文摘要：
采用传统和分子生物学方法，对广东省发生的美人蕉、姜花、黄穗和百日草4种花卉青枯病的病原进行了鉴定。通过病菌形态观察、染色试验、生理生化性状测定以及细菌16SrDNA序列分析，结果表明4种花卉青枯病病原为茄科劳尔氏菌Ralstonia solanacearum。这4种花卉的青枯病均为国内首次报道，且这4种花卉均为茄科劳尔氏菌R．solanacearum的新寄主。
英文摘要：
A study was carried out on the identification of pathogenic bacteria to cause Canna generalis, Hedychium coronarium, Solidago cannnnnadensis and Zinnia elegans to wilt in Guangdong Province. With the research on the morphological observation, bacteria staining, physiological and biochemical characteristics determination, as well as the 16S rDNA sequence analysis of the pathogenic bacteria, the results showed that the pathogenic bacteria from the 4 species of flowering plants were identified as Ralstonia solanacearum. It was first found that Canna generalis , Solidago cannnnnadensis and Zinnia elegans were infected by Ralstonia solanacearurn in China.
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