%0 Journal Article %A Mcvittie, Anne %T Ultrastructural Studies on Sporulation in Wild-type and White Colony Mutants of Streptomyces coelicolor %D 1974 %J Microbiology, %V 81 %N 2 %P 291-302 %@ 1465-2080 %R https://doi.org/10.1099/00221287-81-2-291 %I Microbiology Society, %X Summary: Examination of thin sections of sporulating wild-type colonies revealed new structural details of the development of the sporulation-septum walls. Spores with very thick (about 75 nm) three-layered walls were seen in spore preparations. Of the sporulation defective (whi) mutants examined, whiDI6 was defective in spore-wall thickening while whiF99 was defective in rounding up and produced rod-shaped, thick-walled spores. A third mutant (whi-92) showed occasional abnormality in sporulation-septum spacing and produced immature as well as mature spores. One mutant (whi-53) produced only a few spores, all structurally normal. In two whiE mutants, structural abnormalities in spores were absent or rare. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-81-2-291