• Microbiology and Biotechnology Letters
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• v.17 no.4
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• pp.327-333
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• 1989

The purplish-red pigment was formed on agar plate by superimposed streaking of Streptomyces propurpuratus ATCC 21630 and strain R-89, The strain No.89 was ascribable to the genus Bacillus and designated as Bacillus sp. R-89. Both strain did not produced such pigment when cultivated independently. For hyperpigment production, we selected the mutant S.P-6 from Streptomyces propurpuratus ATCC 21630 by MNNG (N-methyl-N'-nitro-N-nitrosoguanidine) treatment. Maximum purplish-red pigment 1420 mg/$m\ell$ were produced, when the mutant of R-16 and Bacillus sp. R-89 were mixed cultured at 3$0^{\circ}C$ for 72 hr.