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Stability of plasmid profiles of highly virulent races of Xanthomonas campestris pv. malvacearum during storage and subculturing Gossypium hirsutum L.; India
Stability of plasmid profiles of highly virulent races of Xanthomonas campestris pv. malvacearum during storage and subculturing Gossypium hirsutum L.; India
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Stability of plasmid profiles of highly virulent races of Xanthomonas campestris pv. malvacearum during storage and subculturing Gossypium hirsutum L.; India
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Stability of plasmid profiles of highly virulent races of Xanthomonas campestris pv. malvacearum during storage and subculturing Gossypium hirsutum L.; India
Stability of plasmid profiles of highly virulent races of Xanthomonas campestris pv. malvacearum during storage and subculturing Gossypium hirsutum L.; India

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Stability of plasmid profiles of highly virulent races of Xanthomonas campestris pv. malvacearum during storage and subculturing Gossypium hirsutum L.; India
Stability of plasmid profiles of highly virulent races of Xanthomonas campestris pv. malvacearum during storage and subculturing Gossypium hirsutum L.; India
Journal Article

Stability of plasmid profiles of highly virulent races of Xanthomonas campestris pv. malvacearum during storage and subculturing Gossypium hirsutum L.; India

2004
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Overview
Four races of Xanthomonas campestris pv. malvacearum (Xcm), viz races 23, 27 and 32 (isolated from Gossypium hirsutum) and race 23b (from Gossypium barbadense) were studied. The plasmid profile of the natural isolates showed four plasmids in races 23 and 23b (ca. 60, 40, 23, 8.2 kb), five in race 27 (ca. 60, 40, 23, 8.2 and 3.7 kb) and six in race 32 (ca. 60, 40, 23, 8.2, 3.7 and 1.6 kb). Continuously sub-cultured laboratory isolates of the Xcm races resulted in the loss of all but two plasmids, ca. 60 and 40 kb in size. When the laboratory isolates were passed through cotton (Gossypium hirsutum), they regained certain plasmids so that four plasmids were found in race 23 and 23b (ca. 60, 40, 23 and 8.2 kb), five in race 27 (ca. 60, 40, 23, 8.2 and 3.7 kb) and six in race 32 (ca. 60, 40, 23, 8.2, 3.7 and 1.6 kb), which was more or less similar to the original isolates. The isolates recovered from cotton maintained their plasmid profile (except for minor changes in the miniplasmids) after storage for six months at _70 deg C in 50% glycerol. It is suggested that plasmid profiles among highly virulent races of Xcm are unstable during repeated sub-culturing at room temperature, resulting in rapid loss of some plasmids. However, when the cultures were sub-cultured and stored at _70 deg C, the plasmid profile was fairly stable except for the miniplasmids (ca. 3.7 and 1.6 kb) [Sono state studiate quattro razze di Xanthomonas campestris pv. malvacearum (Xcm), cioè le razze 23, 27 e 32 (isolate da Gossypium hirsutum) e la razza 23b (isolata da Gossypium barbadense). Il profilo dei plasmidi degli isolati naturali ne evidenziava quattro nelle razze 23 e 23b (ca. 60, 40, 23, 8,2 kb), cinque nella 27 (ca. 60, 40, 23, 8,2 e 3,7 kb) e sei nella razza 32 (ca. 60, 40, 23, 8,2, 3,7 e 1,6 kb). Gli isolati delle razze di Xcm sub-coltivati continuamente in laboratorio andavano incontro alla perdita di tutti i plasmidi salvo due, di ca. 60 e 40 kb. Quando venivano passati attraverso il cotone (Gossypium hirsutum), gli isolati di laboratorio riacquistavano certi plasmidi, per cui nelle razze 23 e 23b sono stati ritrovati quattro plasmidi (ca. 60, 40, 23 e 8,2 kb), cinque nella razza 27 (ca. 60, 40, 23, 8,2 e 3,7 kb) e sei nella razza 32 (ca. 60, 40, 23, 8,2, 3,7 e 1,6 kb), che risultava più o meno simile agli isolati originali. Gli isolati recuperati dal cotone mantenevano il loro profilo plasmidico (eccetto che per cambiamenti secondari a carico dei miniplasmidi) dopo una conservazione per sei mesi a _70 gradi C in glicerolo al 50%. I risultati fanno ritenere che i profili plasmidici delle razze virulente di Xcm siano instabili nel corso della sub-coltura a temperatura ambiente e vadano incontro a una perdita rapida di alcuni plasmidi. Tuttavia, quando si effettuava la sub-coltura e la conservazione a _70 gradi C, il profilo plasmidico risultava sostanzialmente stabile, eccetto che per i miniplasmidi (ca. 3,7 e 1,6 kb)]