Abstract
This paper deals with apical dominance using a dicotylar model obtained after decapitation of pea seedlings with two shoots — one dominant and the other inhibited. When the dominant shoot was decapitated the inhibited one is released from inhibition and after 24 to 72 h begins to grow. However, the levels of trans-zeatin and production of ethylene increase within 4 and 6 hours respectively after release from inhibition, and within an interval of 72 h the levels of both phytohormones begin gradually to decrease. This indicates that also in this model, the release from apical dominance is associated with an increase in the level of cytokinin zeatin and, thereafter, also with an increased production of ethylene. If indolyl-3-acetic acid (IAA) is applied on the decapitated main stem after decapitation of the dominant shoot, the growth of the initially inhibited one is very strongly retarded; if, however, IAA is applied on the decapitated dominant shoot, this inhibition is significantly weaker. This means that the inhibiting effect of IAA on the inhibited shoot originates to a greater degree from the main stem rather than from the dominant shoot. The effect of benzyladenine (BA) is transferred equally from the decapitated main stem and from the decapitated dominant shoot because the initially inhibited shoot begins to grow as well as also other shoots from serial cotyledonary buds.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Bieleski R.L. 1964. The problem of halting enzyme action when extracting plant tissues. Anal. Biochem. 9: 431442.
Blažková J., Dundelová M., Psota V. & Procházka S. 1987. Changes in the level of endogenous IAA in lateral cotyledonary buds of pea seedlings after decapitacion. Proc. International Symposium “Physiology and biochemistry of auxins in plants” 28.9.–2.10.1987. Academia Praha, pp. 223–224.
Cline M.G. 1991. Apical dominance. Bot. Rev. 57: 318–358.
Dostál R. 1939. Über die Auslösung der Korrelation zwischen den Kotylaren bei Pisum sativum. Ber. Deutsch. Bot. Ges. 57: 204–230.
Fišerová H., Kula E., Klemš M. & Reinöhl V. 2001. Phytohormones as indicators of the degree of damage in birch. Biologia 56: 405–409.
Fišerová H., Šebánek J., Hradilík J., Doležel P. & Vítková H. 2006. The role of cytokinins in growth correlations between the root and stem in pea (Pisum sativum L.) seedlings. Plant Soil Environ. 52: 159–163.
Jablanoviè M. & Neškoviè M. 1977. Changes in endogenous level of auxins and cytokinins in axillary buds of Pisum sativum L. in relation to apical dominance. Biol. Plant. 19: 34–39.
Lexa M., Genkov T., Malbeck J., Macháèková I. & Brzobohatý B. 2003. Dynamics of endogenous cytokinin pools in tobacco seedlings: A modelling approach. Ann. Bot. 91: 585–597.
Li C.J. & Bangerth F. 1992. The possible role of cytokinins, ethylene and IAA in apical dominance. Progress in Plant Growth Regulation, Kluwer Academic Publ., pp. 431–436.
Li C.J. & Bangerth F. 1999. Autoinhibition of IAA transport in the shoots of two branched pea plants and its relationship to correlative dominance. Physiol. Plant. 106: 415–420.
Li C.J. & Bangerth F. 2003. Stimulatory effect of cytokinins and interaction with IAA on the release of lateral buds of pea plants from apical dominance. J. Plant. Physiol. 160: 1059–1063.
Li C.J., Guevara E., Herrera J. & Bangerth F. 1995. Effect of apex excision and replacement by 1-naphthyl-acetic acid on cytokinin concentration and apical dominance in pea plants. Physiol. Plant. 94: 465–469.
Mc Steen P. & Leyser O. 2005. Shoot branching. Ann. Rev. Plant Biol. 56: 353–374.
Procházka S. 1982. Apical dominance. Folia Univ. Agr. Brno: 1–45.
Procházka S. & Jacobs W.P. 1984. Transport of benzyldenine and gibberellin A1 from roots in relation to the dominance between the axillary buds of pea (Pisum sativum) cotyledons. Plant Physiol. 76: 224–227.
Rashotte A.M., Chae H.S., Maxwell B.B. & Kieber J.J. 2005. The interaction of cytokinin with other signals. Physiol. Plant. 123: 184–194.
Sachs T. 1966. Senescence of inhibited shoots of peas and apical dominance. Ann. Bot. 30: 447–456.
Šebánek J. 1973. Die Ursachen der Apikaldominanz des Hauptsprosses über die Seitenknospen. Biol. Rundschau 11: 337–351.
Šebánek J. & Hradilík J. 1974. On the role of endogenous substances of the auxin group in the correlation between the cotyledon and its axillar bud in pea (Pisum sativum L.). Acta Univ. Agr. Brno A 22: 421–426.
Šebánek J., Vítková H., Klíèová Š. & Psota V. 1988. The release of the cotyledonary shoot of Pisum sativum from inhibition in relation to changes in the levels of endogenous auxins, cytokinins and gibberellins. Biol. Plant. 30: 351–356.
Snow R. 1925. The correlative inhibition of the growth of axillary buds. Ann. Bot. 39: 841–859.
Snow R. 1937. On the nature of correlative inhibition. New Phytol. 36: 283–300.
Thimann K.V. & Skoog F. 1933. On the inhibition of bud development and other functions of growth substance in Vicia faba. Proc. Royal Soc. Series B 114: 317–339.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Fišerová, H., Šebánek, J., Hradilík, J. et al. Release of cotyledonary shoots of pea (Pisum sativum) seedlings from inhibition as related to endogenous zeatin and ethylene and exogenous IAA and benzyladenine. Biologia 62, 51–55 (2007). https://doi.org/10.2478/s11756-007-0002-y
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.2478/s11756-007-0002-y