Fig. 1.

IAA enhances filamentation and surface adhesion. A and B show the edge of a yeast patch (Σ1278b) growing on filamentation-inducing media (8) with xylose as the carbon source. Plates were incubated in the dark to prevent photodegradation of IAA. For the purpose of comparing the images, A and B were taken at the same magnification. (Bar in A, 10 μm.) (A) The yap1-1 mutant filaments at low levels of IAA (2 μM), and wild type does not. (B) Wild-type filaments at higher concentrations of IAA (50 μM). IAA-enhanced filamentation is abolished in all seven avt mutants (avt3-1 and avt4-1 are shown). (C) Northern blot analysis shows that IAA induces expression of FLO11. (D) IAA enhances haploid invasive growth of S. cerevisiae. Cells were patched on media containing IAA (120 μM). U, unwashed; W, washed.