A tracheid-differentiation factor from pine needles |
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Authors: | R A Savidge P F Wareing |
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Institution: | (1) Department of Botany and Microbiology, University College of Wales, SY23 3DA Aberystwyth, Dyfed, U.K. |
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Abstract: | Exogenous indol-3yl-acetic acid (IAA), alone and together with several cytokinins, was ineffective in promoting the complete differentiation into tracheids of cambial derivatives of Pinus contorta Dougl.; IAA alone promoted cambial cell division and primary-wall growth in cambial derivatives throughout the stem's length. In contrast, a single pair of needles on a stem cutting in light promoted neither cambial cell division nor primary-wall growth in cambial derivatives but did promote complete differentiation of cambial cells into tracheids; tracheids differentiated only near the junction of the foliated short shoot with the stem. Clear inter-and intracellular differences in the extent of tracheid differentiation occurred in response to a single needle pair and have suggested the hypothesis that a specific tracheid-differentiation factor regulates the differentiation of cells into proto-, meta-, or secondary-xylem tracheary elements through an interaction with IAA.Abbreviations IAA
indol-3yl acetic acid
- K
kinetin
- BAP
6-benzylaminopurine
- Z
zeatin
- ZR
zeatin riboside
- FAA
formalin: acetic acid: ethanol: water (10:5:50:35, by vol.) |
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Keywords: | Auxin Cytokinin Leaves (needles) Pinus Pits bordered Tracheid-differentiation factor Vascular cambium Xylem |
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