Table 2.

M. grisea Strains Used in This Study

Strain	Genotype	Mutant Phenotype	Reference
Guy11	Wild-type rice pathogen		Silué et al., 1992
nn95	Δpmk1	Unable to elaborate appressoria. Non-pathogenic, even when introduced into plant tissue by infiltration. PMK1 encodes a MAP kinase that can act as a functional homolog of FUS3 from budding yeast	Xu and Hamer, 1996
DF51	ΔcpkA	Non-pathogenic. Makes small non-functional appressoria. CPKA encodes a catalytic subunit of cAMP-dependent protein kinase A.	Mitchell and Dean, 1995 Xu et al., 1997
DA-99	Δmac1 sum1-99	Bypass suppressor of Δmac1 adenylate cyclase mutant. Restores appressorium formation, but not full pathogenicity. Carries mutation in a cAMP-binding site of SUM1-encoded regulatory subunit of PKA	Adachi and Hamer, 1998
6-R-10	buf1	Melanin biosynthesis mutant. Unable to penetrate rice cuticle. BUF1 encodes polyhydroxynaphthalene reductase	Chumley and Valent, 1990 Howard and Valent, 1996