The effect of cytokinin- and auxin-like substances on the anatomy and ultrastructure of vascular bundles in wheat |
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Authors: | Blanka Rovenská Alena Volfová L Chvojka |
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Institution: | (1) Institute of Experimental Botany of the Czechoslovak Academy of Sciences, Ke dvoru 15, 166 30 Praha 6, Czechoslovakia |
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Abstract: | 6-benzylaminopurine (BAP), β-indolylbutyric acid (IBA), phenylacetic acid (PAA) and a triazine herbicide (TH) affected the
development of vascular bundles both in coleoptiles and the last intemodium below the ear of wheat plants. These substances
were applied before the conductive tissues in the organs investigated were fully differentiated, the degree of their effect
being dependent not only on the concentration, but also on the developmental stage of the plants and on cultivation conditions.
In coleoptiles the area of vascular bundles was increased especially in the dark. In the stalk, BAP, PAA, IBA and IBA + TH
increased the area of phloem. BAP also stimulated the activity of parenchymatous cells of xylem. TH had the same effect only
on xylem, which became evident by an increase in vascular bundle area, but not in that of phloem. These anatomical aberrations
were confirmed by cytological analysis which revealed that the stimulatory effect of the substances investigated consisted
in activation both of companion cells of phloem and parenchymatous cells of xylem, whose function is analogous. As a result,
both types of cells contained numerous organelles characteristic of meristematic cells, which suggests protein synthesis and
an active transport of substances. |
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