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Here, the partial hcnBC sequence was determined for a worldwide collection of biocontrol fluorescent Pseudomonas spp. Phylogenies based on hcnBC and deduced protein sequences revealed four main bacterial groups, but topological incongruences were found between hcnBC and rrs-based phylogenies, suggesting past lateral transfer of hcnBC among saprophytic root-colonizing pseudomonads. Three of the four groups included isolates from different countries and host plants. Yet, these groups corresponded to distinct, ecologically-adapted populations of HCN-producing biocontrol fluorescent pseudomonads, as indicated by high hcnBC distinctness ratio values and the differences in production levels of HCN in vitro found between groups. This is in accordance with previous results on catabolic properties and biocontrol abilities of these strains. HCN synthase gene diversity may thus reflect the adaptive radiation of HCN<jats:sup>+<\/jats:sup>biocontrol fluorescent pseudomonads. Positive correlations were found between HCN production in vitro and plant protection in the cucumber\/Pythium ultimum and tomato\/Fusarium oxysporum f. sp. radicis-lycopersici pathosystems.<\/jats:p>","DOI":"10.1094\/mpmi.2003.16.6.525","type":"journal-article","created":{"date-parts":[[2007,5,11]],"date-time":"2007-05-11T09:25:13Z","timestamp":1178875513000},"page":"525-535","source":"Crossref","is-referenced-by-count":176,"title":["Phylogeny of HCN Synthase-Encoding<i>hcnBC<\/i>Genes in Biocontrol Fluorescent Pseudomonads and Its Relationship with Host Plant Species and HCN Synthesis Ability"],"prefix":"10.1094","volume":"16","author":[{"given":"Alban","family":"Ramette","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michele","family":"Frapolli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Genevi\u00e8ve","family":"D\u00e9fago","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yvan","family":"Mo\u00ebnne-Loccoz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1665","reference":[{"key":"p_20","doi-asserted-by":"publisher","DOI":"10.1099\/00207713-50-1-9"},{"key":"p_21","doi-asserted-by":"publisher","DOI":"10.1007\/BF00709654"},{"key":"p_22","doi-asserted-by":"publisher","DOI":"10.1099\/00207713-50-4-1563"},{"key":"p_23","doi-asserted-by":"publisher","DOI":"10.1016\/0038-0717(87)90037-X"},{"key":"p_24","doi-asserted-by":"publisher","DOI":"10.1007\/s002039900127"},{"key":"p_25","doi-asserted-by":"publisher","DOI":"10.1051\/agro:2000112"},{"key":"p_26","doi-asserted-by":"publisher","DOI":"10.1139\/m75-088"},{"key":"p_27","doi-asserted-by":"crossref","first-page":"701","DOI":"10.1128\/aem.45.2.701-702.1983","volume":"45","author":"Castric K. 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