This experiment investigates the effects of ancymidol, a gibberellin (GA) inhibitor, on the stem growth of wild-type (WT) and tall mutant Brassica Rapa (B. Rapa). GAs are plant hormones that promote stem elongation. The tall mutant, which overproduces these GAs, was said to show reduced elongation when treated with ancymidol. To test this, both genotypes were divided into control and experimental groups, and developed over thirteen days with treatments on Days 0 and 7 and measurements on Days 0, 4, 7, 10, and 13. WT plants showed no significant response to ancymidol, with final heights nearly identical between groups. However, the tall mutants exhibited a visible effect and those treated were significantly shorter than the control. These results support the hypothesis; ancymidol inhibits growth in GA concentrated plants.
John Braddell (Sat,) studied this question.