Abstract
Summary Treatment of «Little Marvel» dwarf pea (Pisum sativum) seeds with 3 ppm ethephon was followed by subsequent exposure to: 1. complete darkness; 2. visible light; and 3. ultraviolet irradiation (UV). Cell free extracts of distal root, root tip, proximal stem, and leaf tissues (20-day-old) were assayed for IAA-1-14C destruction. Distal root and root tip tissue extracts of ethephon-treated seeds and subsequent exposure of the seedlings to UV showed marked IAA-1-14C destruction compared to proximal stem and leaf cell-free extracts. The present study suggests that IAA-1-14C destruction may be enzymic in nature and different in all four tissues (root tip, dorsal root, proximal stem, and leaf) depending upon the exposure treatment (dark, visible light and UV), with or without ethephonpretreatment.
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