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Journal of Experimental Botany, Vol 49, 1405-1411, Copyright © 1998 by Oxford University Press

ARTICLES

An appraisal of the use of reciprocal transfer experiments: assessing the stages of photoperiod sensitivity in chrysanthemum cv. Snowdon (Chrysanthemum morifolium Ramat.)

S Adams, S Pearson and P Hadley
The Department of Horticulture, School of Plant Sciences, The University of Reading, Reading, Berkshire RG6 6AS, UK; Corresponding author at Horticulture Research International, Wellesbourne, Warwick CV35 9EF, UK

Reciprocal transfer experiments can be used to describe the stages of photoperiod sensitivity in day-length-sensitive plants. However, there are inconsistencies in the literature concerning the techniques used and, more importantly, the assumptions made when analysing such data sets. This paper appraises the use of reciprocal transfer experiments, with chrysanthemum as a model (short day) plant.Experiments showed little evidence to suggest that axillary meristems were incapable of responding to a floral stimulus when released from apical dominance by pinching (even though the apex appeared vegetative). Five short days given after pinching resulted in sufficient induction to initiate an inflorescence, although seven short days were required to commit a plant to flower with a leaf number similar to plants grown in continuous short days. Floral initiation was then visible at the apex after nine short days. Once the inflorescence had been initiated, long days delayed the early stages of flower development.The results are discussed with reference to reciprocal transfer experiments in general, and specifically in relation to problems that arise when the length of a 'juvenile' phase is confounded with the number of inductive cycles for flower commitment.Keywords: Reciprocal transfer, chrysanthemum, photoperiod, juvenility, flowering
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