Hormone interplay in the regulation far-red-responsive stem elongation in tomato 4 117 Figure 4.5. Stem responses to different IAA treatments. We treated 14 day-old tomatoes with 25 μM or 100 μM IAA by whole plant spray, or by brushing onto leaf 1 and internode 1. Spray and brush were applied 3 times over one week treatment period. The data includes measurements of (a) illustration of how internode+leaf brush or whole plant spray were carried out, (b) internode 1 length of 25 μM IAA treatment, (c) internode 1 diameter of 25 μM IAA treatment, (d) internode 1 length of 100 μM IAA treatment, (e) internode 1 diameter of 100 μM IAA treatment, (f) representative photos of the phenotypes for brushing IAA on internode or leaf 1, (g) internode 1
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