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

• 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
• ISSN: 0032-0935; 1432-2048
• DOI: 10.1007/s004250050128

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.