Lysogeny in mycobacteria. I. Conversion of colony morphology, nitrate reductase activity, and Tween 80 hydrolysis of Mycobacterium sp. ATCC 607 associated with lysogeny

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Abstract
Colony changes from rough to smooth were observed in a rough strain of Mycobacterium ATCC 607 after exposure to phages D29 and B4. The colonies surviving after exposure to these 2 phages were both smooth and lysogenic. Increased nitrate reductase and Tween 80 hydrolytic activities accompanied lysogenization. Loss of lysogeny was accompanied by conversion to the rough colony type and a decrease in nitrate reductase and Tween 80 hydrolytic activities. The rapid loss and gain of these multiple characteristics suggested that the genetic control lies in a plasmid of mycobacteria.