Roles of Auxins and Cytokinins in Apical Dominance
The term apical dominance refers to the inhibition of growth of subtending lateral (axillary) buds by a growing shoot apex. Some degree of apical dominance is found in all seed plants, and the phenomenon obviously is of profound significance in determining growth form. In some herbaceous plants [e.g. pea (Pisum sativum) and sunflower (Helianthus annuus)] apical dominance is quite strong, the lateral buds commonly are suppressed, and the shoot thus develops as a single main axis or monopodium. In other species [e.g. tomato (Lycopersicum esculentum) and potato (Solanum tuberosum)] apical dominance is much weaker and the shoot is extensively branched. Sometimes apical dominance is only partial, in which case some of the lateral buds develop while others remain fully inhibited.
KeywordsIndoleacetic Acid Apical Dominance Helianthus Annuu Ginkgo Biloba Short Shoot
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