Life cycle of fusarium oxysporum cubense in banana
Answers
Life cycle of Fusarium oxysporum f. sp. cubense (Foc) in banana. (A) Spores (micro and macro conidia and chlamydospores) rest in the soil or on alternative hosts such as weeds. (B) Chlamydospores germinate stimulated by root exudates and the germ-tubes penetrate banana roots. (C) Foc grows through the cortex to the epidermis and mycelium invades the vascular system. (D) Conidia and chlamydospores are constantly produced in the vascular tissues. Conidia are rapidly distributed through the plant via transpiration system. Mycelium and gum blocks the vascular tissues and first symptoms of yellowing are observed in the older leaves. (E) Foc colonizes and destroys more vascular tissues provoking intense wilting. (F) Infected plant dies and the follower plant (daughter), which was contaminated by the mother plant through vascular connection, shows initial symptoms. Mother plant eventually falls down and disease cycle starts again.
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