Figure 3.

Chemotropic growth of hyphae toward capillary tubes containing 20 μm genistein. Zoospores were induced to encyst in a random orientation. Approximately 3 h after the introduction of the capillary into the chemotaxis chamber, the angles of hyphal tips were measured relative to a line drawn from the counterpoint of the mouth of the capillary. •, Cosine of growth angle; thick line, cosines averaged over a 200-μm window at 20-μm increments; thin line, upper and lower 95% significance limits for cosine means calculated using a t test. The number of data points in each window ranged from 30 to 66. Chemotropism was considered significant when the lower confidence limit was greater than 0.