Chapter 4 128 4.15b). Furthermore, an increase in pith cell thickness and number was observed with the application of GA, and this effect was enhanced in the presence of GA+IAA. These findings indicate cell enlargement and elongation across all cell types when assessing their lengths (Figure 4.15c, e, f, g, h). The collective evidence highlights that the combined action of GA and IAA not only overcomes the inhibitory effect on cell division but also promotes cell elongation. Figure 4.14. Stem response to different concentration GA3 combined with IAA. We brushed the first internode of 14 day-old tomatoes with different concentration GA3 and IAA (or mock) in WL or FR conditions over one week FR treatment. Brushing was applied 3 times over oneweek treatment period. Data includes measurements of (a) Stem length, (b) Hypocotyl length, (c) Internode 1 length, (d) Hypocotyl diameter, (e)Internode 1diameter. Data are presented as mean ± SEM, and different letters indicate significant differences between treatments based on ANOVA analysis with Tukey’s post hoc test (P<0.05). There are 12 biological replicates, and the experiment was repeated twice.
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