“…Our results, indicating that losses of both auxins were substantial after autoclaving for 20 min, differ from earlier reports (Dunlap and Robacker, 1988;Pence and Caruso, 1984;Yamakawa et al, 1979). Pence and Caruso (1984) used a root initiation bioassay rather than direct measurement of IAA, a method that may have given spurious results. Yamakawa et al (1979) determined IAA levels using the indole-a-pyrone method, a procedure that has found limited acceptance because of problems with interfering compounds (Crozier et al, 1980).…”