Exploring conservation of cellular-level traits in shade avoidance syndrome among species 5 193 Figure 5.16. Summary of gene expression in response to FR. Discovering the FR-responsiveness of these transcription factors exclusive to Solanaceae is interesting. This finding not only highlights a distinctive regulation within this family but also implies that their elongation mechanisms or other downstream processes likely diverge from those observed in other plant families. Our findings revealed a consistent expression pattern within the family and a clear downregulation observed in Fabaceae species, underscoring that the opposite behaviour of the TF homologs was conserved within legumes (Fig 5.10-12, 5.16). We found that the regulatory network governing elongation or other SAS-induced processes appears to vary between dicots. Additionally, the observation that auxin does not play as clear a role in tomato shade avoidance as it does in Arabidopsis (Chapter 4) suggests a fundamental difference in the wiring of shade avoidance responses between tomato and Arabidopsis. This nuanced understanding opens up exciting avenues for exploring the unique dynamics of plant growth and regulatory pathways within the Solanaceae family. So why is Solanaceae special? With the limitation of our species selections, we could not find a clear pattern, so expanding our method to more species and families to construct a detailed evolutionary picture might help to answer this question. 5.3.3 Summary In conclusion, our species diversity approach has underscored the diverse responsiveness to supplemental FR light with respect to internode elongation, expression of transcription factor genes and cellular dynamics between a panel of dicotyledonous plant species. We are paving the way for future inquiries into SAS regulation in different species with the potential to understand how these responses became wired at the molecular level through the course of evolution.
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