For instance, in most filamentous fungi,
iron uptake is essential for viability [22], and under iron starvation,
most fungi excrete low-molecular-weight ferric-ironspecific
chelators, termed siderophores, to mobilize environmental
iron [22]. Subsequently, iron from the ferrisiderophore
complexes is recovered via specific uptake mechanisms.
In Aspergillus fumigatus and Aspergillus nidulans,
siderophore biosynthesis is negatively regulated by carbon
source [22]. In Ustilago maydis, gene products related to iron
uptake affect the development of plant disease