Acuña G, Alvarez-Morales A, Hahn M, Hennecke H. A vector for the site-directed, genomic integration of foreign DNA into soybean root-nodule bacteria.
PLANT MOLECULAR BIOLOGY 1987;
9:41-50. [PMID:
24276796 DOI:
10.1007/bf00017985]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/1987] [Accepted: 04/01/1987] [Indexed: 06/02/2023]
Abstract
A non-essential DNA region carrying two different repeated sequences (RSβ3 and RSα9) adjacent to a nitrogen fixation (nif) gene cluster has been identified previously in Bradyrhizobium japonicum strain 110. In closely related B. japonicum strains a similar genomic arrangement was found. We constructed a mobilizable plasmid vector carrying RSβ3 and RSα9, and a kanamycin resistance cassette (nptII gene) plus suitable cloning sites inserted between the two repeated sequences. Using this vector (pRJ1035), stable integration of a lacZ gene fusion into the B. japonicum genomic RS region was achieved. The resulting strain yielded more than 10-fold higher β-galactosidase activity in soybean root nodules as compared to a B. japonicum strain carrying the same lacZ fusion on a pRK290-based plasmid.
Collapse