Journal of Experimental Botany, Vol 49, 555-562, Copyright © 1998 by Oxford University Press
R Emery, N Longnecker and C Atkins
The concentrations of indole-3-acetic acid (IAA), cytokinins (CK) and
abscisic acid (ABA) were measured in buds of different regions (main stem
and lateral branches) of Lupinus angustifolius L. (cv.
Merrit) and at different stages in the development of branches. In lupin,
branching patterns are the result of discrete regions of axillary branches
(upper, middle and basal) which elongate at much different rates. Early in
development only the main shoot elongates, followed usually by basal branch
growth and then rapid upper branch growth. Branches in the middle of the
main stem grow only weakly or fail to develop. Levels of IAA were generally
high in the apical buds of slowly growing branches and low in buds from
strongly growing branches, whereas CK levels showed the opposite
relationship. CK:IAA ratio showed a closer relationship with the rate of
growth of a particular branch better than the levels of either CK or IAA
alone. During early stages of growth ABA concentration did not follow the
rate of branch growth. However, later in development, where growth did not
closely match the ratio of CK:IAA, ABA level showed a strong negative
relationship with growth. A significant decrease in ABA was associated with
continued strong growth of the main stem apex following a decline in CK:IAA
ratio. Overall, the best relationship between the level of growth factors
in apical buds and branching pattern in lupin was the ratio of CK:IAA,
implying that high CK:IAA at a given bud would promote growth. ABA level
appeared to play a secondary role, as a growth
inhibitor.Keywords: Apical dominance, cytokinin,
auxin, abscisic acid, Lupinus angustifolius.
ARTICLES
Branch development in Lupinus angustifolius L.#II. Relationship with endogenous ABA, IAA and cytokinins in axillary and main stem buds
Centre for Legumes in Mediterranean Agriculture, Botany Department, University of Western Australia, Nedlands, WA 6907, Australia; Corresponding author; E-mail: rjnemery@cyllene.uwa.edu.au
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