The invention relates to the technical field of
biological engineering, and discloses a method for producing agricultural
tryptophan through
fermentation and application, and the method comprises the following steps: after thalli are accumulated, adding L-
serine in a pulse manner, switching to double-carbon-
source material supplementation of glucose and
glycerol, and starting
energy metabolism uncoupling control at the same time; according to the
energy metabolism decoupling control, a decoupling agent is fed, a real-time
respiration quotient is used as a feedback
signal, and a closed-loop
system is used for automatically adjusting the flow
acceleration rate, so that the
respiration quotient is maintained in a
target range. According to the invention,
intracellular energy charge is reduced through uncoupling so as to relieve
glycolysis inhibition and strengthen
carbon flux, double carbon sources are utilized to maintain
redox balance, and pulse feeding is matched to eliminate terminal synthesis
bottleneck. According to the method, the metabolic competition problem of
cell growth and product synthesis is effectively solved, the conversion rate and
fermentation yield of
tryptophan are effectively improved, and the obtained product is suitable for preparing an agricultural
fertilizer synergist or a
feed additive.