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Plant Physiol. Apr 1988; 86(4): 1095–1098.
PMCID: PMC1054633

Cytokinin Fluxes during Floral Induction in the Long Day Plant Sinapis alba L. 1


Sinapis alba is a long-day (LD) plant that can be induced to flower by a single LD. A number of changes normally occurring in the meristem of plants subjected to the LD can be produced in short day by a single application of a cytokinin to the apical bud. However, flower buds are not produced indicating that evocation by the cytokinin is only partial. In this work, the cytokinin content of root exudate, obtained under vacuum, and of leaf exudate, obtained by the EDTA-method, has been analyzed comparatively in vegetative and induced plants, using reversed-phase HPLC coupled to the Amaranthus bioassay. The results show that, as early as 16 hours after the start of the LD, there is an increase of cytokinin activity in both the root and leaf exudates of induced plants. These observations fit nicely with previous results obtained on Sinapis, and they indicate that cytokinins are part of the floral stimulus in this species.

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Selected References

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  • Bernier G, Kinet JM, Jacqmard A, Havelange A, Bodson M. Cytokinin as a Possible Component of the Floral Stimulus in Sinapis alba. Plant Physiol. 1977 Aug;60(2):282–285. [PMC free article] [PubMed]
  • Bodson M, Outlaw WH. Elevation in the Sucrose Content of the Shoot Apical Meristem of Sinapis alba at Floral Evocation. Plant Physiol. 1985 Oct;79(2):420–424. [PMC free article] [PubMed]
  • Cahill DM, Weste GM, Grant BR. Changes in Cytokinin Concentrations in Xylem Extrudate following Infection of Eucalyptus marginata Donn ex Sm with Phytophthora cinnamomi Rands. Plant Physiol. 1986 Aug;81(4):1103–1109. [PMC free article] [PubMed]
  • Carmi A, Staden JV. Role of roots in regulating the growth rate and cytokinin content in leaves. Plant Physiol. 1983 Sep;73(1):76–78. [PMC free article] [PubMed]
  • Heindl JC, Carlson DR, Brun WA, Brenner ML. Ontogenetic variation of four cytokinins in soybean root pressure exudate. Plant Physiol. 1982 Dec;70(6):1619–1625. [PMC free article] [PubMed]
  • Palmer MV, Wong OC. Identification of Cytokinins from Xylem Exudate of Phaseolus vulgaris L. Plant Physiol. 1985 Sep;79(1):296–298. [PMC free article] [PubMed]
  • van Staden J, Dimalla GG. Endogenous Cytokinins in Bougainvillea ;San Diego Red': I. OCCURRENCE OF CYTOKININ GLUCOSIDES IN THE ROOT SAP. Plant Physiol. 1980 May;65(5):852–854. [PMC free article] [PubMed]

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