The isolates that produced the highest levels of IAA were used to
evaluate the induction of secondary roots and the growth of the tap
root. Eucalyptus plants were cultivated in an in vitro system according
to Lehr et al. (2008), with modifications. Briefly, 25 mL of ¼
MS mediumwas poured in a Petri dish (9 cm in diameter), and after
the agar solidified, a semicircle of medium was discarded and one
plant was placed on the remaining semicircle (Fig. 1).