Summary
The lower axillary buds of intact plants of Solanum sisymbrifolium are released from complete inhibition by supplying high doses of potassium to the soil while complete apical dominance is shown by plants grown at low, but not deficiency levels of K. Nitrate and phosphate supplied alone or together are ineffective but when either of them is supplied with K, the effect of the latter on the growth of axillary buds is somewhat enhanced. The buds thus released from inhibition elongate further only when supplied with gibberellin A3 (GA3). Indoleacetic acid (IAA) alone has a considerably weaker effect but when supplied with GA3 the stimulatory effect is greater than is caused by the latter alone. The completely inhibited buds of low-K plants can be released from inhibition by supplying kinetin. In such buds IAA promotes further extension but GA3 does not. The partially inhibited buds of the high-K plants, on the other hand, are not affected by exogenous kinetin.
Similar content being viewed by others
References
Champagnat, P.: Physiologie de la croissance et de l'inhibition des bourgeons: Dominance apicale et phénomènes analogues. Encycl. Plant Physiol., vol. XV/1, p. 1106–1164 (W. Ruhland, ed.). Berlin-Göttingen-Heidelberg: Springer 1965.
Gregory, F. G., Veale, J. A.: A reassessment of the problem of apical dominance. Symp. Soc. exp. Biol. 11, 1–20 (1957).
Jacobs, W. P., Case, D. B.: Auxin transport, gibberellin and apical dominance. Science 148, 1729–1731 (1965).
Palmer, J. H., Phillips, I. D. J.: The effect of terminal bud, indoleacetic acid and nitrogen supply on the growth and orientation of the petiole of Helianthus annuus. Physiol. Plantarum (Cph.) 16, 572–584 (1963).
Phillips, I. D. J.: Nitrogen, phosphorus and potassium distribution in relation to apical dominance in dwarf bean (Phaseolus vulgaris cv. Canadian Wonder). J. exp. Bot. 19, 617–627 (1968).
Ruddat, M., Pharis, P. R.: Participation of gibberellin in the control of apical dominance in soybean and redwood. Planta (Berl.) 71, 222–228 (1966).
Sachs, T., Thimann, K. V.: The role of auxins and cytokinins in the release of buds from dominance. Amer. J. Bot. 54, 136–144 (1967).
Scott, T. K., Case, D. B., Jacobs, W. P.: Auxin-gibberellin interaction in apical dominance. Plant Physiol. 42, 1329–1333 (1967).
Sěbánek, J., Hink, J.: Die Bedeutung der Attraktion von Gibberellin durch Indolyl-essigsäure bei apikaler Dominanz. Planta (Berl.) 76, 124–129 (1967).
Vardar, Y.: Auxin factor in apical dominance. Wiss. Z. Univ. Rostok 16, 505–513 (1966).
Wakhloo, J. L.: Evidence for indole-3-acetic acid and tryptophan in the shoot of Solanum nigrum and the effect of potassium nutrition on their levels. Planta (Berl.) 65, 301–314 (1965).
Wickson, M., Thimann, K. V.: The antagonism of auxin and kinetin in apical dominance. Physiol. Plantarum (Cph.) 11, 62–74 (1958).
Witt, J.: Über den Einfluß von Stickstoffmangel auf den Wuchsstoffhaushalt von Helianthus annuus L. Port. Acta biol. 8, 196–248 (1964).
Author information
Authors and Affiliations
Additional information
Dedicated to Professor H. D. Wulff on the occasion of his 60th birthday.
Rights and permissions
About this article
Cite this article
Wakhloo, J.L. Role of mineral nutrients and growth regulators in the apical dominance in Solanum sisymbrifolium . Planta 91, 190–194 (1970). https://doi.org/10.1007/BF00385477
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00385477