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Development of Common Milkweed (Asclepias syriaca) Root Buds Following Emergence from Lateral Roots

Published online by Cambridge University Press:  12 June 2017

Elizabeth J. Stamm-Katovich ,
Donald L. Wyse  and
David D. Biesboer
Elizabeth J. Stamm-Katovich
Affiliation:
Dep. Bot. Univ. Minnesota, St. Paul, MN 55108
Donald L. Wyse
Affiliation:
Dep. Bot. Univ. Minnesota, St. Paul, MN 55108
David D. Biesboer
Affiliation:
Dep. Bot. Univ. Minnesota, St. Paul, MN 55108
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Abstract

In common milkweed, the development of subterranean root buds on excised root segments, following emergence from the parent root, is characterized by development of nodes and internodes followed by internode expansion. Transverse sections of root buds reveal that bicollateral vascular bundles as well as leaf traces and gaps are well developed in buds from 3-month-old plants. Strands of xylem and phloem connect the parent root and root bud in both inhibited and noninhibited root buds. Pitted primary tracheary elements, characteristic of developmentally advanced primary xylem, are present in these traces. The occurrence of a well-developed vascular system throughout the root bud and between the parent root and bud provides evidence that retardation of growth of inhibited root buds in common milkweed is not caused by anatomical constraints.

Keywords

Common milkweed, Asclepias syriaca L. # ASCSYRoot bud inhibitionvascular connectionsroot bud anatomyASCSY
Type
Weed Biology and Ecology
Information
Weed Science , Volume 36 , Issue 6 , November 1988 , pp. 758 - 763
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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