Nitrogen Fixation and Soybean Genetics Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Building 011, HH19, BARC-West, Beltsville, Maryland 20705.
Appl Environ Microbiol. 1988 Aug;54(8):1907-10. doi: 10.1128/aem.54.8.1907-1910.1988.
Phaseolus plant introduction (PI) genotypes (consisting of 684 P. vulgaris, 26 P. acutifolius, 39 P. lunatus, and 5 P. coccineus accessions) were evaluated for their ability to form effective symbioses with strains of six slow-growing (Bradyrhizobium) and four fast-growing (Rhizobium fredii) soybean rhizobia. Of the 684 P. vulgaris genotypes examined, three PIs were found to form effective nitrogen-fixing symbioses with the R. fredii strains. While none of the Bradyrhizobium strains nodulated any of the genotypes tested, some produced large numbers of undifferentiated root proliferations (hypertrophies). A symbiotic plasmid-cured R. fredii strain failed to nodulate the P. vulgaris PIs and cultivars, suggesting that P. vulgaris host range genes are Sym plasmid borne in the fast-growing soybean rhizobia.
684 份普通菜豆(Phaseolus vulgaris)、26 份刀豆(Phaseolus acutifolius)、39 份利马豆(Phaseolus lunatus)和 5 份红扁豆(Phaseolus coccineus)品系的菜豆种间杂种被用来评价它们与 6 株慢生(Bradyrhizobium)和 4 株快生(Rhizobium fredii)大豆根瘤菌菌株形成有效共生体的能力。在 684 份普通菜豆基因型中,有 3 个品系与 R. fredii 菌株形成了有效的固氮共生关系。虽然没有一株 Bradyrhizobium 菌株能使任何所测试的基因型结瘤,但有些菌株却产生了大量未分化的根增生(肥大)。共生质粒缺失的 R. fredii 菌株未能使普通菜豆 PIs 和品种结瘤,这表明普通菜豆的宿主范围基因是在快生大豆根瘤菌中由 Sym 质粒携带的。