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Evidence is presented that growth substances have a role in directing the movement of assimilates towards the developing flowers of carnation. Removal of the terminal flower resulted in decreased upward movement of 14C-labelled assimilates from a source leaf on the flowering shoot. Applications of indole-3yl-acetic acid or gibberellic acid to the stump of the flower stem partially restored the pattern of movement to that found in the intact shoot. Two gibberellin-like substances and one auxin-like substance were detected in extracts of the floral tissues. Levels of growth substances appeared to be higher in the flower than elsewhere in the flowering shoot.
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Jeffcoat et al. (1972) studied this question.