Abstract
Immature inflorescences of Sorghum bicolor (L.) Moench were cultured on defined media that contained isopentenyl adenine or gibberellin A 3 (GA 3, gibberellic acid) to examine the effect of these phytohormones on the development of phyllody or leafy panicles, a common symptom associated with sorghum head smut, caused by Sporisorium reilianum. Floral primordia after application of GA 3 reverted to a vegetative leafy growth and these eventually produced autotrophic plants. This response mimics the developmental effect of smut infection. It appeared that the effect of GA 3 was specific for internodal elongation and maintenance of vegetative growth and did not promote or allow floral development. Phyllody in partially infected sorghum plants could therefore be due to an increase in GA 3 in the affected panicles.
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