Abstract
When gametophytes of Onoclea sensibilis are placed on an auxin-containing medium in darkness, the cells of the plant increase in length and width. Measurements were made to determine the effects of cell age and auxin concentration on the magnitude of the cells’ response. When comparing final size with size before auxin treatment, the youngest cells have the greatest response. However, they also have the greatest endogenous growth. The optimum auxin concentration for increase in length changes with the age of the cells. The greatest length is attained in young cells with an auxin concentration of 10−-6–10−-7 m; 10−-5 m auxin is supraoptimal. The greatest increase in width of the cells is produced by 10−-5 m auxin, regardless of cell age. The data are believed best to be interpreted as showing an age-dependent change in the capacity of the cells to respond to auxin.
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