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Tiller Bud Suppression in Reproductive Plants of Lolium multiflorum Lam. Cv. Westerwoldicum

Tiller Bud Suppression in Reproductive Plants of Lolium multiflorum Lam. Cv. Westerwoldicum Abstract The control of tiller bud growth during reproductive development was investigated in experimental plants ofLolium multiflorum Lam. cv. Westerwoldicum that were reduced to a main axis having a developing but unemerged ear, elongating stem internodes, a series of expanded leaves, slow-growing tiller buds and a root system. Isolation of the ear by excision of its base, or decapitation so as to remove the ear together with the upper leaves, promoted the movement of 14C-assimilates to tiller buds, decapitation being the more effective treatment. Application of 0.1 per cent indol–3yl-acetic acid (IAA) to cut tissues of decapitated plants diverted 14C-assimilates to upper internodes but did not reduce import by buds, whereas application of 1.0 per cent IAA both diverted labelled assimilates to upper internodes and reduced bud import. Radioactivity from [14C] IAA applied to the upper leaves or to the ear base was recovered from buds in very small amounts; larger amounts were recovered from buds following the application of labelled IAA to an elongating internode, especially from the bud at the base of the treated internode. It is suggested that tiller bud suppression may be influenced by the movement of inhibitory levels of auxin into buds from nearby elongating stem internodes, whose activity in turn may be controlled by the developing inflorescence and upper leaves. This content is only available as a PDF. © 1977 Annals of Botany Company http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annals of Botany Oxford University Press

Tiller Bud Suppression in Reproductive Plants of Lolium multiflorum Lam. Cv. Westerwoldicum

CLIFFORD, P., E.
Annals of Botany , Volume 41 (3) – May 1, 1977
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Publisher
Oxford University Press
Copyright
© 1977 Annals of Botany Company
ISSN
0305-7364
eISSN
1095-8290
DOI
10.1093/oxfordjournals.aob.a085329
Publisher site
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Abstract

Abstract The control of tiller bud growth during reproductive development was investigated in experimental plants ofLolium multiflorum Lam. cv. Westerwoldicum that were reduced to a main axis having a developing but unemerged ear, elongating stem internodes, a series of expanded leaves, slow-growing tiller buds and a root system. Isolation of the ear by excision of its base, or decapitation so as to remove the ear together with the upper leaves, promoted the movement of 14C-assimilates to tiller buds, decapitation being the more effective treatment. Application of 0.1 per cent indol–3yl-acetic acid (IAA) to cut tissues of decapitated plants diverted 14C-assimilates to upper internodes but did not reduce import by buds, whereas application of 1.0 per cent IAA both diverted labelled assimilates to upper internodes and reduced bud import. Radioactivity from [14C] IAA applied to the upper leaves or to the ear base was recovered from buds in very small amounts; larger amounts were recovered from buds following the application of labelled IAA to an elongating internode, especially from the bud at the base of the treated internode. It is suggested that tiller bud suppression may be influenced by the movement of inhibitory levels of auxin into buds from nearby elongating stem internodes, whose activity in turn may be controlled by the developing inflorescence and upper leaves. This content is only available as a PDF. © 1977 Annals of Botany Company

Journal

Annals of Botany – Oxford University Press

Published: May 1, 1977

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