Using plant mini-Ti cosmid pEND4K, the cosmid genomic library of Sesbania rostratawas constructed. Sizes of plant DNA inserts in clones were 25- 33 kb. The restrictionmapping showed that different recombinant involved various types of plant DNA insert. 4clones containing leghemoglobin gene sequence of S. rostrata were obtained by in situ hy-bridization of colonies. The cloning of leghemoglobin gene sequence has been confirmedby plasmid DNA dot hybridization and Southern blot hybridization.
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