AOBPreview published online on August 5, 2002
Annals of Botany, doi:10.1093/aob/mcf200
© 2002 by Annals of Botany Company
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Submitted on March 25, 2002
Affiliation of the authors:
1 AgResearch Grasslands, Private Bag 11008, Palmerston North, New Zealand
* To whom correspondence should be addressed. E-mail: mike.hay{at} agresearch.co.nz.
This study describes the successive stages of development of branches from axillary buds in fully rooted plants of Trifolium repens grown in near optimal conditions, and the way in which this developmental pathway differs when nodal root formation is prevented as plants grow out from a rooted base. Cuttings of a single genotype were established in a glasshouse with nodal root systems on the two basal phytomers and grown on so that nodal rooting was either permitted (+R) or prevented (
Revised on May 20, 2002
Accepted on June 11, 2002
A Developmentally Based Categorization of Branching in Trifolium repens L.: Influence of Nodal Roots
R. G. THOMAS1, 
R). In +R plants, axillary tissues could be assigned to one of four developmental categories: unemerged buds, emerged buds, unbranched lateral branches or secondarily branched lateral branches. In R plants, branch development was retarded, with the retardation becoming increasingly pronounced as the number of R phytomers on the primary stolon increased. Retarded elongation of the internodes of lateral shoots on R plants resulted in the formation of a distinct fifth developmental category: short shoots (defined as branches with two or more leaves but with mean internode length equal to, or less than, 10 % of that of the immediately proximal internode on the parent stolon) which had reduced phytomer appearance rates but retained the potential to develop into lateral branches. Transfer of +R plants to R conditions, and vice versa, after 66 d demonstrated that subsequent branch development was wholly under the control of the youngest nodal root present, regardless of the age and number of root systems proximal to it.
Key words: Trifolium repens (L.), white clover, branching architecture, branch development, nodal roots, short shoots.
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