麹菌に関する研究

(第9報)人工変異株の形態的変化についての考察

抄録

(1) Alterations in microscopic details and its relations to changes in colony appearence were studied about 202 mutants of Aspergillus sojae SAKAGUCHI et YAMADA induced by ultraviolet, X-ray and nitrogen mustard (mostly ultraviolet ray).
(2) There was scarcely any difference in the rate of linear growth among the parent straina, lbino, yellow, brown, bluish green any olive type mutants. The rest of the mutants decreased in the rate of linear growth in comparison with the above.
(3) Echinulations of eonidia`l walls which had important meaning in taxonomic studies existed except 6 strains and the surface of conidiophore walls were observed to be smooth. Therefore, above two properties were found to be comparatively unchangeable.
(4) The shape and size of each organs were found remarkably changed except above two, properties. It was presumed that these organs were changeable by induced mutations.
(5). Surveying the relation between alteration of structure and colony type, it was concluded that alterations in microscopic details were scarcely observed in mutants differed conidial color only compared with the parent, however, morphological changes were observed mostly in the mutants of regressive types as restricted colonies and degenerated colonies in sporulation.