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Articles

Inhibition of Abscission by Calcium ¹

^a Department of Horticulture, Purdue University, Lafayette, Indiana 47907

An inhibition of abscission in bean petiole explants is reported for additions of calcium salts, especially at concentrations between 10^–3 and 10^–1M. Magnesium is less effective, and other commmon macronutrients are ineffective in inhibiting abscission. Evidence from timing experiments indicates that the calcium inhibition may act on the stage I or the "juvenile" stage of the explant, and that the inhibition of abscission may result from a retardation of senescence development in the pulvinar tissues of treated explants.

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