Effect of Gibberellic Acid on Growth, Gibberellin Content, and Chlorophyll Content of Leaves of Potato (Solanum tuberosum)

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Abstract
Spraying potato plants with a solution of gibberellic acid (GA) when the 15th leaf was emerging increased the area of this leaf and its total gibberellin content, assayed by dwarf French bean leaf disks. GA, assayed by lettuce hypocotyls, was not detected in leaves from untreated plants. The GA content of leaves from GA-treated plants decreased after 2 weeks and none was detectable after 5 weeks; apparently it was converted to another gibberellin, possibly the same as the natural gibberellin. GA increased chlorophyll content per leaf but increased leaf area more so that the chlorophyll per unit area decreased, and the leaves were paler than untreated leaves.

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