The Effects of Kinetin, Gibberellic Acid, and Light on Expansion and Cell Division in Leaf Disks of Dwarf Bean (Phaseolus vulgaris)

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Abstract
The effects of kinetin (Kn), gibberellic acid (G), and light (L) on cell expansion and division in disks from 6-day-old etiolated primary leaves of dwarf bean are described. Cell number was determined by direct counting after disks were digested in a pectinase/EDTA mixture to separate the cells. Kn increased leaf expansion wholly by increasing cell size. G also increased cell size; it increased cell division in the dark but not in the light. Light also increased cell size and cell division; it eliminated the effect of G on cell division but enhanced the effect of G on cell expansion.