Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, Apdo. 1095, 41080 Seville, Spain, and Department of Microbiology, University of Bristol, The Medical School, University Walk, Bristol, BS8 1TD, United Kingdom.
Appl Environ Microbiol. 1988 Jul;54(7):1812-7. doi: 10.1128/aem.54.7.1812-1817.1988.
Different Rhizobium and Bradyrhizobium strains were screened for their ability to produce melanin. Pigment producers (Mel) were found among strains of R. leguminosarum biovars viceae, trifolii, and phaseoli, R. meliloti, and R. fredii; none of 19 Bradyrhizobium strains examined gave a positive response. Melanin production and nod genes were plasmid borne in R. leguminosarum biovar trifolii RS24. In R. leguminosarum biovar phaseoli CFN42 and R. meliloti GR015, mel genes were located in the respective symbiotic plasmids. In R. fredii USDA 205, melanin production correlated with the presence of its smallest indigenous plasmid.
不同的根瘤菌和慢生根瘤菌菌株被筛选出来，以检测它们产生黑色素的能力。在根瘤菌生物变种 viceae、trifolii 和 phaseoli、R. meliloti 和 R. fredii 菌株中发现了色素产生菌（Mel）；在 19 株被检测的慢生根瘤菌菌株中，没有一株产生阳性反应。黑色素的产生和nod 基因在根瘤菌生物变种 trifolii RS24 中是质粒携带的。在根瘤菌生物变种 phaseoli CFN42 和 R. meliloti GR015 中，mel 基因位于各自的共生质粒中。在 R. fredii USDA 205 中，黑色素的产生与最小的本土质粒的存在相关。
