Xylem changes in the correlative inhibition of lateral bud growth in flax (Linum usitatissimum L.) |
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Authors: | Manjarabad V S Raju William N Marchuk |
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Institution: | (1) Biology Department, University of Regina, S4S 0A2 Regina, Saskatchewan, Canada;(2) Biology Department, Red Deer College, T4N 5H5 Red Deer, Alberta, Canada |
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Abstract: | Xylem or tracheary changes at the base of the cotyledonary buds of flax seedlings (Linum usitatissimum L.), released from inhibition by decapitation of the main apex were studied. The differentiation of xylem strands and/or
tracheary elements was correlated with the growth in length of the lateral buds, especially 48–72 hr after the removal of
the main apex. The xylem strands, connected to the hypocotylary stele or not, and the tracheary elements increased with age
within and outside the strands of both non-decapitated and decapitated seedlings. In the latter, the differentiation of these
structures, however, occurred much earlier and in greater abundance in the same regions. The early growth in length of lateral
buds, 1 or 2 hr after decapitation, was correlated with the early development of tracheary perforations in the xylem strands.
The xylary strands with perforated elements are known to be more efficient than those without them. Therefore, it is suggested
that the inhibition of lateral-bud growth was due, in fact, to a lack of appropriate tracheary perforations in the bud xylem
strands that were connected with the hypocotylary stele of flax seedlings. |
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Keywords: | Apical dominance Flax Linum Xylem changes |
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