Rapid increases in cytokinin concentration in lateral buds of chickpea (Cicer arietinum L.) during release of apical dominance |
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Authors: | Colin G N Turnbull Myriam A A Raymond Ian C Dodd Suzanne E Morris |
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Institution: | (1) Department of Botany, The University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia, AU |
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Abstract: | We examined the role of cytokinins (CKs) in release of apical dominance in lateral buds of chickpea (Cicer arietinum L.). Shoot decapitation or application of CKs (benzyladenine, zeatin or dihydrozeatin) stimulated rapid bud growth. Time-lapse
video recording revealed growth initiation within 2 h of application of 200 pmol benzyladenine or within 3 h of decapitation.
Endogenous CK content in buds changed little in the first 2 h after shoot decapitation, but significantly increased by 6 h,
somewhat later than the initiation of bud growth. The main elevated CK was zeatin riboside, whose content per bud increased
7-fold by 6 h and 25-fold by 24 h. Lesser changes were found in amounts of zeatin and isopentenyl adenine CKs. We have yet
to distinguish whether these CKs are imported from the roots via the xylem stream or are synthesised in situ in the buds,
but CKs may be part of an endogenous signal involved in lateral bud growth stimulation following shoot decapitation. To our
knowledge, this is the first detailed report of CK levels in buds themselves during release of apical dominance.
Received: 12 December 1996 / Accepted: 7 January 1997 |
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Keywords: | : Apical dominance Axillary bud Cicer Cytokinin |
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