Changes in a Leaf-growth Substance in Cotyledons and Primary Leaves during the Growth of Dwarf Bean Seedlings

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Abstract
The growth of etiolated dwarf bean leaf disks in darkness was used to assay leaf-growth substances extracted from plant tissues and separated on chromato-grams. A leaf-growth substance, with the same Rf value in isopropanol/ammonia as gibberellic acid, was found in the acidic fraction of extracts from dwarf bean primary leaves and cotyledons. Neither neutral nor basic leaf-growth substances were found in primary leaf extracts. The amount of leaf-growth substance per cotyledon reached a maximum at the 4th day in cotyledons, whether bean plants were grown in the light or dark. Primary leaves of dwarf bean plants grown in the light reached their maximum content of leaf-growth substance later than the cotyledons; the time of maximum content coincided with the maximum growth-rate of the primary leaves. Leaf-growth substances did not accumulate in primary leaves of plants grown in the dark.

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