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

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 detache...

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Bibliographic Details
Published in:Weed science 1989-09, Vol.37 (5), p.680-687
Main Authors: Robertson, J. Mason, Taylor, John S., Harker, K. Neil, Pocock, Robert N., Yeung, Edward C.
Format: Article
Language:English
Subjects:
Apical dominance
Biological and medical sciences
BRACTEA
BRACTEE
BROTACION
CRECIMIENTO
CROISSANCE
Decapitation
DEFOLIACION
DEFOLIATION
DORMANCE
ELYMUS
Experimentation
Fundamental and applied biological sciences. Psychology
Generalities, botany, ecology, damages, economic importance
Herbicides
INHIBIDORES DEL CRECIMIENTO
INICIACION DE LA YEMA
INITIATION DU BOURGEON
LATENCIA
Leaf buds
Leaves
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
Plants
POUSSEE
RAMIFICACION
RAMIFICATION
RETARDATEUR DE CROISSANCE
RHIZOME
Rhizomes
RIZOMAS
Sprouting
Vascular tissues
Weed Biology and Ecology
Weeds
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Summary: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.
ISSN:0043-1745
1550-2759
DOI:10.1017/S0043174500072635