Fig. 4. (A) Growth and IAA production(high correlationr¼þ0.994; Po0.006)for strain A7CK under different ferulic acid concentration in culture.(B) Growth and IAA
production (r¼þ0.965; Po0.035) for strain A3CK under different protocatechuic acid concentration in culture. Y-axis bar shows standard value up to 73%.