1990. Diffusible IAA and dominance phenomena in fruits of apple and tomato -Physiol. Plant 79: 354-358.The relationships between indole-3-acetic acid (IAA) diffusing out of the fruit and competition among fruits, and between fruits and shoot tips were investigated using apple (Mains domestica Borkh. cv. Jonagold) and tomato {Lycopersicon esculentum Miii.) piants. Dominant fruits always had more diffusible IAA than subordinated, inhibited fi'uits. Alterations in dominance -by fruit-or shoot tip removal -led to significant changes in diffusible IAA by the remaining fruits. This chalnge could be detected one day after dominance modification. It is suggested that diffusible IAA is involved in the correlative signal regulating dominance relationships between fruits, and between fruits and shoots in apple and tomato.

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