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Annals of Botany 39: 369-374, 1975
© 1975 Annals of Botany Company

RESEARCH-ARTICLE

Light Effects on Apical Dominance

R. J. FIELD and D. I. JACKSON

Lincoln College Canterbury, New Zealand

Received: 13 May 1974   

Reducing light intensity from 18·0 klx to 5·4 klx promoted main-stem growth in Phaseolus vulgaris but left lateral extension unaffected. Shading individual laterals or apices of main stems promoted elongation of the shaded portion. Increasing day length from 8 to 16 or 24 h did not greatly affect plant growth if full-intensity and full-spectrum light was used. If, however, the additional light was supplied by incandescent tubes containing a high proportion of infra-red light, growth of main stems but not laterals was induced in proportion to the length of the additional light period. It is suggested that the increased growth of the main stem in response to infra-red light prevented the equivalent response of the laterals because of the enhanced ability of the main stem to suppress lateral elongation.


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