The present invention provides a recombinant microbial strain capable of
stably producing a polyhydroxyalkanoic acid (PHA) at a high production
rate in an industrial fermentation process. The present invention also
relates to a recombinant microbial strain prepared by substituting an
exogenous polyhydroxyalkanoic acid synthase gene for a
polyhydroxyalkanoic acid synthase gene on the chromosome of the
microorganism.