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- Publisher
- Wiley
- Copyright
- Copyright © 1953 Wiley Subscription Services, Inc., A Wiley Company
- ISSN
- 0028-646X
- eISSN
- 1469-8137
- DOI
- 10.1111/j.1469-8137.1953.tb07518.x
- Publisher site
- See Article on Publisher Site
Abstract
Department of Botany, University College of Leicester {Received 6 February 1953) (With 6 figures in the text) INTRODUCTION Previous experiments with Lemna minor (Wangermann & Ashby, 1951; Ashby & Wangermann, 1951) led to the tentative hypothesis that there is in the frond a factor A concerned with ageing. The level of this factor at any time is assumed to determine the size of the daughter fronds produced by the frond at that time; and the level of A is assumed to be high early in the life of the frond, and to become lower as the frond becomes older until it falls to a threshold value below which the frond dies. In the experiments reported in this paper an attempt was made to discover the nature of A: (i) by supplying fronds through the culture medium with substances known to have morphogenetic properties, and (ii) by interfering with the action of substances with morphogenetic properties which are likely to be present in the frond. EXPERIMENT.'^L PROCEDURE AND RESULTS The apparatus, culture solution, and experimental technique were similar to those used in previous experiments (see Wangermann & Ashby, 1951). Temperature was 25° C. and daylight was 14 hr. in
Journal
New Phytologist – Wiley
Published: Jul 1, 1953