Cellular basis of the effects of gibberellin and theprogene on stem growth in tomato

摘要

Tomato (Lycopersicon esculentumMill.) plants homozygous for the mutantprogene, exhibiting the distinctive procera phenotype, appeared virtually identical to gibberellic acid (GA3)-treated isogenic normal plants. Theprogene and GA3caused analogous increases in internode length, and in the length and number of cells in the outer cell layers of each internode. Internode number was also increased byproand GA3over the period of the experiment. Despite their greater length, the internodes of GA3-treated andproplants reached their final size within a time period similar to that of internodes of untreated normal plants. Thepromutant itself was responsive to GA3, especially in the seedling stage, but the proportional increase in height seen in the later stages of growth was less than that of normal plants.