Conidiophore

Definition

A specialized hyphal structure that bears and produces conidia (asexual fungal spores) externally. Conidiophores vary enormously in architecture—simple or branched, sessile or stalked, solitary or aggregated into complex fruiting bodies—and their morphology is taxonomically diagnostic. In entomopathogenic fungi such as Beauveria and Metarhizium, conidiophores emerge from the cadaver of an infected insect to release infectious conidia that initiate new disease cycles in arthropod populations.

Etymology

From New Latin: conidium (asexual spore, from Greek konis 'dust') + -phore (bearing)

Example

In Beauveria bassiana, a widely used biological control agent of insect pests, dense clusters of conidiophores erupt through the cuticle of a killed host, each conidiophore producing chains of white, powdery conidia that disperse to infect neighboring insects.

Synonyms

• sporophore (in part, broader)

Related Terms

• conidium
• Hypha
• entomopathogenic fungus
• Metamorphosis
• Biological control
• Cuticle
• spore dispersal

Usage Notes

Distinguished from sporangiophore, which bears spores internally within a sporangium (as in Zygomycota). Conidiophore architecture—dimensions, branching pattern, and arrangement of conidiogenous cells—is a primary character for identifying anamorphic (asexual) fungi. In insect pathology, the density and timing of conidiophore production on a host cadaver influence epizootic spread. The term is strictly mycological; do not confuse with bacterial or actinomycete spore-bearing structures.