Macroconidiation in <i>ΔFvhtf1</i> mutant.

<p>(A) In wild-type strain (A149) and the complementation strain (<i>ΔFvht1-Com</i>), incipient macroconidia without septation are produced on terminal phialides or hyphae. The gene-deletion mutant (<i>ΔFvhtf1</i>) failed to form macroconidia from aberrant terminal phialides. <i>ΔFvhtf1</i> produced mature conidium with clear septation from the tip of the hyphae. The macroconidia of <i>ΔFvhtf1</i> deletion mutant showed a morphological defect. These observed phenotypes in <i>ΔFvhtf1</i> are consistent with what we witnessed in <i>F. graminearum</i> mutant (<i>ΔFghtf1</i>). tp, terminal phialides; ma, macroconidia; nr, narrow region, ac, apical cell; bc, basal cell (foot cell). Bar = 20 µm. (B) Macroconidia production by A149, <i>ΔFvhtf1</i>, and <i>ΔFvht1-Com</i> in mung bean liquid medium under continuous dark conditions. (C) Macroconidia production by A149, <i>ΔFvhtf1</i>, and <i>ΔFvht1-Com</i> in mung bean liquid medium under UV light conditions.