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Alternaria tenuissima
''Alternaria tenuissima'' is a saprophytic fungus and opportunistic plant pathogen. It is cosmopolitan in distribution, and can colonize a wide range of plant hosts.〔 Colonies of ''A. tenuissima'' produce chains on agar growth media.〔 The fungus often forms concentric ring patterns on infected plant leaves〔 or fruits, particularly citrus.〔 This species produces the allergen Alt a 1, one of the most important outdoor seasonal fungal allergens associated with allergy and asthma provocation.〔 In rare circumstances, this species is also known to infect immunosuppressed humans and animals.〔
==Growth and morphology==
Unlike many other species of ''Alternaria'', the conidiophores of ''A. tenuissima'' can develop in darkness after the colony has been exposed to light even very briefly; however its growth is more robust with longer periods of light exposure.〔 After 5-7 days in culture, colonies of ''A. tenuissima'' reach a diameter of 5 cm on PCA or V-8 agar (vegetable juice agar).〔 Colonies grown on PCA are brown in colour with a loose, cottony texture and bearing golden-brown conidia in chains.〔 Conidia are on the areas of the colony that receive the most light exposure, forming concentric sporulating rings of uncrowded conidial chains growing from branching hyphae on PCA.〔 Sporulation tends to be much more crowded in colonies grown on V-8 agar.〔 Simple unbranched and branched conidial chains of moderate length as well as solitary conidia are interspersed across the colony especially areas that receive little light.〔
The light, golden-brown colour of the conidia, and their tendency to taper into long beaks, distinguish ''A. tenuissima'' from similar species notably ''A. alternata'' which produces dark brown conidia with short beaks.〔 Conidia of ''A. tenuissima'' also grow individually or in short chains〔 of 2-5 units,〔 while ''A. alternata'' tends to grow in longer chains.〔 ''Alternaria tenuissima'' conidia are smooth-walled〔 and have a median and subconstricting transverse septum.〔 Colonies of ''A. tenuissima'' on natural substrates (e.g., plant leaves) often develop a concentric, ringed pattern.〔 This species is also responsible for "black rot" of citrus fruits.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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