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18. Differential changes in surface structure and ß-galactosidase expression in colonies produced by the sibling al 16 and al 18 cultures. The left panel shows a colony produced by the al 16 culture on XGal-glucose agar after 13 days of incubation. Note that the darker sectors can be seen to be raised above the main colony surface in the area of most intense axial illumination. The two right panels show a colony produced by the al 18 culture on XGalglucose agar photographed after 8 days of incubation.
Thus, ß-galactosidase expression can be linked in two different ways with alternative patterns of bacterial aggregation, and it is not the general rule that greater XGal hydrolysis correlates with poorer growth. The observation of surface concavities like those in the al 18 colonies also reflects the operation of specific controls over colony architecture, because cells from more extensively proliferating areas would simply fill in the empty spaces in an unorganized growth process. Subcloning by picking and suspending bacterial masses from the colony centers and from visible sectors on the al and b2 subsubclonal colonies produced four- and five-digit cultures with a wide variety of morphogenetic expressions.
Pseudomonas putida COLONIES 37 isolation of mutagen- and transposon-induced alk and cam mutations. However, this apparent genomic tranquility changed dramatically in PPS2532 strains and other CAM-OCT : : MudII1681 derivatives. Figure 4 schematizes the genealogies of all the cultures studied. The two-digit subclones all originated from isolated colonies on the XGal-glycerol plate illustrated in Fig. 2. Three lineages were studied in depth: al, bl, and b2. Because its pattern of ß-galactosidase expression most closely resembled that of the original PPS2532 isolates, the bl lineage was followed with a specific objective: to determine how typical were the surprising changes illustrated in Fig.