Table 1.

U. maydis strains used in this study

Strain	Relevant characteristics
518*	Wild-type a2b2
UMC015†	a2b2 urbs1::phleor
UMC002‡	a2b2 urbs1-1 NTG mutant of 518
UMC005‡	a2b2 urbs1-2 NTG mutant of 518
UMC007‡	a2b2 urbs1-3 NTG mutant of 518
UMC002-1†	a2b2 urbs1-1 gene replacement mutant
UMC005-1†	a2b2 urbs1-2 gene replacement mutant
UMC007-1†	a2b2 urbs1-3 gene replacement mutant

^*Obtained from R. Holliday (Commonwealth Scientific and Industrial Research Organization, Laboratory for Molecular Biology, Sydney). 

^†Constructed by gene replacement as described in the text. 

^‡NTG urbs1 mutants of 518 (8).