Abstract
The diameter and wall thickness of tracheids produced after indoleacetic acid treatment were not significantly different from those of the intact controls, for the first few weeks after treatment of disbudded shoots of Picea abies Karst. and Picea sitchensis (Bong.) Carr. However, lateral application of indoleacetic acid (IAA) to intact shoots increased both tracheid diameter and wall thickness; it is suggested that IAA acted synergistically with another endogenous growth regulator, which was also removed by disbudding. Increase in wall thickness after exogenous IAA was associated with increase in duration of the wall thickening phase of tracheid differentiation; this is discussed in relation to the seasonal change from early to latewood. Cambial dormancy was induced by disbudding during active wood production. Since this occurred with or without the presence of current leaves, it is concluded that in Picea continued cambial activity depends upon supply of auxin from the buds, and cannot be supplied from expanded leaves or from the internode itself. Neither indoleacetic acid nor gibberellic acid stimulated renewed cambial activity when applied after the cessation of wood production. With both disbudded and intact shoots, the effectiveness of exogenous IAA declined with time, probably due to decreasing penetration through callus developing at the wounded surface. It is suggested that this apparent change in IAA effectiveness may explain some discrepancies between the results of previous observers.
Similar content being viewed by others
Abbreviations
- IAA:
-
Indoleacetic acid
- GA3 :
-
Gibberellic acid
References
Balatinecz, J.J., Kennedy, R.W.: Mechanism of earlywood-latewood differentiation in Larix decidua. Tappi. 51, 414–422 (1968)
Denne, M.P.: A comparison of root and shoot-wood development in conifer seedlings. Ann. Bot. 36, 579–587 (1972)
Denne, M.P.: Wood production and structure in relation to bud activity in some softwood and hardwood species In: Wood structure in biological and technological research. pp. 204–211, Baas, P., Bolton, A.J., Catling, D.M., Eds.. Leiden University Press 1976
Gordon, J.C., Larson, P.R. Seasonal course of photosynthesis, respiration, and distribution of 14C in young Pinus resinosa trees as related to wood formation. Plant. Physiol. 43, 1617–1624 (1968)
Jenkins, P.A.: Influence of applied indoleacetic acid and abscisic acid on xylem cell dimensions in Pinus radiata D. Don. In: Mechanisms of regulation of plant growth pp. 737–742, Bieleski, R.L., Ferguson, A.R., Cresswell, M.M., Eds.: Wellington: Roy. Soc. N.Z. 1974
Larson P.R.: Some indirect effects of environment on wood formation. In: The formation of wood in forest trees, pp. 345–365, Zimmermann, M.H., Ed.: New York: Academic Press 1964
Nix, L.E.: The role of growth regulators in tracheid differentiation of Southern pines, Ph.D. Thesis, University of Georgia, Athems, GA (1974)
Nix, L.E., Wodzicki, T.J.: The radial distribution and metabolism of IAA-14C in Pinus echinata stems in relation to wood formation. Canad. J. Bot. 52, 1349–1355 (1974)
Robards, A.W., Davidson, E., Kidwai, P.: Short-term effects of some chemicals on cambial activity. J. exp. Bot. 20, 912–921 (1969)
Roberts, L.W.: Cytodifferentiation in plants. Xylogenesis as a model system. Cambridge University Press 1976
Sheldrake, A.R., Northcote, D.H.: The production of auxin by tobacco internode tissues. New Phytol. 67, 1–11 (1968)
Skene, D.S.: The kinetics of tracheid development in Tsuga canadensis Carr. and its relation to tree vigour. Ann. Bot. 36, 179–187 (1972)
Wareing, P.F., Roberts, D.L.: Photoperiotic control of cambial activity in Robinia pseudacacia L. New Phytol. 55, 356–368 (1956)
Wareing, P.F., Hanney, C.E.A., Digby, J.: The role of endogenous hormones in cambial activity and xylem differentiation, pp. 323–344. In: The formation of wood in forest trees, Zimmermann, M.H., New York: Academic Press 1964
Wodzicki, T.J.: Photoperiodic control of natural growth-substances and wood formation in larch (Larix decidua D.C.). J. Exp. Bot. 15, 584–599 (1964)
Wodzicki, T.J.: Mechanism of xylem differentiation in Pinus silvestris L. J. exp. Bot. 22, 670–687 (1971)
Wodzicki, T.J., Zajaczkowski, S.: Effect of auxinon xylem tracheids differentiation in decapitated stems of Pinus silvestris L. and its interaction with some vitamins and growth regulators. Acta Soc. Bot. Pol. 43, 129–148 (1974)
Wolter, K.E.: A new method for marking xylem growth. For. Sci. 14, 102–104 (1968)
Zajaczkowski, S.: Auxin stimulation of cambial activity in Pinus silvestris I. The differential cambial response. Physiol. Plant. 29, 281–287 (1973)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Denne, M.P., Wilson, J.E. Some quantitative effects of indoleacetic acid on the wood production and tracheid dimensions of Picea . Planta 134, 223–228 (1977). https://doi.org/10.1007/BF00384186
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00384186