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Dark CO₂ Fixation in Gladiolus Cormels and Its Regulation during the Break of Dormancy

Chen Ginzburg
Plant Physiology
Vol. 56, No. 1 (Jul., 1975), pp. 51-55
Stable URL: http://www.jstor.org/stable/4264100
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Dark CO₂ Fixation in Gladiolus Cormels and Its Regulation during the Break of Dormancy
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Abstract

The increase in dark CO2 fixation during cold storage of Gladiolus x gandavensis van Houtte-type grandiflorus cormels is used to monitor changes in their state of dormancy. Dark fixation is also promoted by benzyladenine, which breaks cormel dormancy, and is inhibited by abscisic acid and gibberellin A3, which inhibit cormel germination. The rate of dark fixation by nondormant cormels is five times higher than that in dormant ones. Dark fixation is not due to microorganisms. It is temperature-dependent and can be measured stoichiometrically in vivo. The apex and base of the cormels accumulate more label than the central part. Dark fixation of both dormant and nondormant cormels is also promoted by imbibition in water. The fate of the labeled assimilates was followed by ion exchange chromatography.

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