BIOL 1010 Chapter Notes - Chapter 24: Vascular Cambium, Cytokinin, Zeatin
14 May 2017
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Auxin produces a number of other effects in addition to stimulating cell elongation and causing stems and roots to lengthen: for example: it induces cell division in the vascular cambium, thus promoting growth in stem diameter. Also, auxin produced by developing seeds promotes the growth of fruit. Plant biologists have found that cytokinins enhance the division, growth and development of plant cells grown in culture: cytokinins also retard the aging of flowers and leaves, thus, florists use cytokinin sprays to keep cut flowers fresh. Cytokinins and auxin interact in the control of apical dominance, the ability of the terminal bud of a shoot to suppress the growth of the axillary buds: fig 24. 4 - Left has an intact terminal bud on the main shoot; on right had the terminal bud of the main shoot removed several weeks earlier. Left, apical dominance inhibited growth of the axillary buds.
