Photoperiodism and Related Phenomena in Plants and Animals

By Robert B. Withrow | Go to book overview

percent indoleacetic acid substituted for the excised axillaries significantly slows flowering again, but it has no effect on the compensatory growth.

The much greater growth of the leaves on the main shoot did not completely compensate for the loss of all leaves on the many axillary shoots--total leaf weight was 60% of that in the intact controls.

The small leaves of the apical bud showed greater compensatory growth when older leaves were present. IAA could not substitute for the older leaves in this effect.

The clone of Coleus blumei used in these experiments was apparently day neutral with respect to flowering: weeks of exposure to short-day and long-day conditions had no significant effect on speed of flowering. Long-day treatments given by extending the normal day gave equivalent results for flowering to those obtained by interrupting the night. But the compensatory growth induced by excising all axillary shoots was reduced by interrupted nights when compared to extended-day treatments.


REFERENCES

Addis, T., and W. Lew. 1940. "The restoration of lost organ tissue. The rate and degree of restoration". J. Exptl. Med., 71, 325-33.

Arthur, J. M., J. D. Guthrie, and J. M. Newell. 1930. "Some effects of artificial climates on the growth and chemical composition of plants". Am. J. Botany, 17, 416-82.

Audus, L. J. 1953. Plant Growth Substances. Interscience, New York.

Bonner, J., and J. Liverman. 1952. "Hormonal control of flower initiation". Growth and Differentiation in Plants, W. E. Loomis, Editor. Iowa State College Press, Ames. Pp. 283-303.

Ebert, J. D. 1954. "Some aspects of protein biosynthesis in development". Aspects of Synthesis and Order in Growth, Dorothea Rudnick, Editor. Princeton University Press, Princeton, N. J. Chapter IV.

Garner, W. W., and H. A. Allard. 1931. "Effect of abnormally long and short alternations of light and darkness on growth and development of plants". J. Agr. Research, 42, 629-51.

Highkin, H. R., and J. B. Hanson. 1954. "Possible interaction between light-dark cycles and endogenous daily rhythms on the growth of tomato plants". Plant Physiol., 29, 301-302.

Hillman, W. S., 1956. "Injury of tomato plants by continuous light and unfavorable photoperiodic cycles". Am. J. Botany, 43, 89-96.

Jacobs, W. P. 1950a. "Auxin-transport in the hypocotyl of Phaseolus vulgaris L." Am. J. Botany, 37, 248-54.

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