. The actinomycetes. Actinomycetales. • • < » [. ^ •y- «»•. Figure 53. J'ormatioii of heterokaryotic col- onics of S. fradiae on minimal agar. Plates 1 and 3 seeded with 10' spores of strain 6F4-1 (methio- nine and isoleucine requiring, and streptomycin sensitive) and 6FS-16 (histidine and argininc rc- fiuiring, and streptomycin resistant), respectively. Plate 2 received a mixture of parental spores and sliows formation of prototrophic colonies (Re- ])roduced from: Braendle, D. H. and Szyi)alski, W. I'roc. Nat. Acad. Sci. V.\: 947 !)o,5, 1957). karyosis and spore production in the aei'ial h
. The actinomycetes. Actinomycetales. • • < » [. ^ •y- «»•. Figure 53. J'ormatioii of heterokaryotic col- onics of S. fradiae on minimal agar. Plates 1 and 3 seeded with 10' spores of strain 6F4-1 (methio- nine and isoleucine requiring, and streptomycin sensitive) and 6FS-16 (histidine and argininc rc- fiuiring, and streptomycin resistant), respectively. Plate 2 received a mixture of parental spores and sliows formation of prototrophic colonies (Re- ])roduced from: Braendle, D. H. and Szyi)alski, W. I'roc. Nat. Acad. Sci. V.\: 947 !)o,5, 1957). karyosis and spore production in the aei'ial hyphae (llopwood). According to Braendle and Szyljalski, aW of the wild-type strains of Streptomyces studied wei'e prototrophic, they formed. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Waksman, Selman A. (Selman Abraham), 1888-1973. Baltimore, Williams & Wilkins
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