ISSN:
1432-2048
Keywords:
Auxin
;
Cytokinin
;
Leaves (needles)
;
Pinus
;
Pits, bordered
;
Tracheid-differentiation factor
;
Vascular cambium
;
Xylem
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00394977
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