Abstract
Green islands were formed on senescing mustard leaves under infection drops containing germinating conidia of Alternaria brassicae and the intensity of the green colour depended upon the concentration of the inoculum. These green islands had higher amounts of cytokinin-like substances than the surrounding yellowed tissue. Cytokinin-like substances were also secreted by the germinating conidia of A. brassicae into the synthetic liquid medium supporting its growth. Application of cytokinin-like substances (extracted from the culture) on the host leaf surface evoked green island formation. These green islands (whether formed under infection drops or under drops of cytokinin-like substances extracted from the culture filtrate extract) acted as localized sinks towards which nutrients moved from surrounding uninfected tissue.
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