The defect of <i>Δmoset1</i> mutants in appressorium formation was restored by exogenous signal molecules.

<p>(A) Effect of <i>Moset1</i> deletion on conidial morphology and appressorium formation. Conidia (a) and appressoria (b) of <i>M</i>. <i>oryzae</i> wild-type strain Br48. Conidia of the <i>Δmoset1</i> mutant showed an elongated shape (c) and seldom formed an appressorium (d). Bar = 10 μm. Exogenous addition of 5mM cAMP (B) and 5μM 1,16-hexadecanediol (C) restored appressorium formation in the <i>Δmoset1</i> mutant. Error bars represent standard deviation.