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Apical Dominance in Rhizomes of Quackgrass (Elytrigia repens): Inhibitory Effect of Scale Leaves

Published online by Cambridge University Press:  12 June 2017

J. Mason Robertson ,
John S. Taylor ,
K. Neil Harker ,
Robert N. Pocock  and
Edward C. Yeung
J. Mason Robertson
Affiliation:
Agric. Canada Res. Stn., Bag Service 5000, Lacombe, Alberta, Canada, T0C 1S0
John S. Taylor
Affiliation:
Agric. Canada Res. Stn., Bag Service 5000, Lacombe, Alberta, Canada, T0C 1S0
K. Neil Harker
Affiliation:
Agric. Canada Res. Stn., Bag Service 5000, Lacombe, Alberta, Canada, T0C 1S0
Robert N. Pocock
Affiliation:
Agric. Canada Res. Stn., Bag Service 5000, Lacombe, Alberta, Canada, T0C 1S0
Edward C. Yeung
Affiliation:
Dep. Biol. Sci., The Univ. Calgary, Calgary, Alberta, Canada, T2N 1N4
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Abstract

Surgical experiments were conducted on cultured five-node apical rhizome segments of quackgrass. Removal of scale leaves promoted an initial burst of growth within the axillary buds but did not support the continued growth of buds as effectively as removal of the rhizome apex. Replacement of detached scale leaves over denuded buds temporarily repressed the promotive effect of scale leaf removal. Aqueous extracts of scale leaf material inhibited apical growth in rhizome segments but did not inhibit bud growth. Anatomical sections revealed that removal of scale leaves promoted development of buds: cells enlarged, vascular tissues differentiated, and new nodes began to form within 4 days of the removal of scale leaves. It is suggested that scale leaves contribute to apical dominance by inhibiting the initial development of axillary buds.

Keywords

Quackgrass(Elytrigia repens (L.) Nevski) ♯3 AGRREAxillary bud dormancy[Agropyron repens (L.) Beauv.]AGRRE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 37 , Issue 5 , September 1989 , pp. 680 - 687
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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