Rapid increases in cytokinin concentration in lateral buds of chickpea (Cicer arietinum L.) during release of apical dominance

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...

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Bibliographic Details
Published in:	Planta Vol. 202; no. 3; pp. 271 - 276
Main Authors:	Turnbull, C.G.N, Raymond, M.A.A, Dodd, I.C, Morris, S.E. (Queensland Univ., St. Lucia, Bisbane, Queensland (Australia). Dept. of Botany)
Format:	Journal Article
Language:	English
Published:	Berlin Springer-Verlag 01-07-1997 Springer
Subjects:	6-BENZILADENINA 6-BENZYLADENINE Agronomy. Soil science and plant productions Apical dominance Apikaldominanz Auxins Biological and medical sciences BIOSINTESIS BIOSYNTHESE BIOSYNTHESIS BOURGEON BUDS Chemical agents Chickpeas CICER ARIETINUM CITOQUININAS CRECIMIENTO CROISSANCE CYTOKININE CYTOKININS Decapitation Dihydrozeatin Economic plant physiology Fundamental and applied biological sciences. Psychology Gehalt in der Pflanze GROWTH Growth and development Growth regulators Isopentenyladenin Peas Phytohormon Plant growth PLANT GROWTH SUBSTANCES Plant physiology and development Plants Seedlings Spross SUBSTANCE DE CROISSANCE VEGETALE SUSTANCIAS DE CRECIMIENTO VEGETAL Vegetative apparatus, growth and morphogenesis. Senescence XILEMA XYLEM XYLEME YEMA (PLANTA) ZEATIN ZEATINA ZEATINE Adenine derivatives Adenine(N Growth Cytokinin Axillary bud Bud Grain legume Leguminosae Cicer arietinum Dicotyledones Angiospermae Plant growth substance Spermatophyta Phytohormone Apical dominance Biological accumulation benzyl
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Summary:	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.
Bibliography:	F60 98G2163
ISSN:	0032-0935 1432-2048
DOI:	10.1007/s004250050128