Chapter 3 82 Figure 3.18. Solyc08g080150, Solyc01g090760, and Solyc07g053450 expression pattern obtained from RNA-seq data. We used normalized expression of these three genes from RNAseq data and plotted it with R 4.0 (R Development Core Team, 2010). 3.3 DISCUSSION Progress has been made in the past decades to identify how the shoot elongation response is regulated during shade avoidance response (SAS) in Arabidopsis, especially at cellular level, i.e. how cell elongation is regulated. Petiole and hypocotyl elongation in Arabidopsis has been well-documented as a characteristic response to an increased presence of far-red (FR) light, with the involvement of auxin-mediated epidermal cell elongation having been substantiated (Bou-Torrent et al., 2014; Procko et al., 2016; Michaud et al., 2017). In the realm of Arabidopsis SAS research, significant attention has been given to deciphering the signals of shade-induced responses, which encompass auxin biosynthesis, transport, and sensitivity activation. These processes are orchestrating organ elongation, notably in petioles (Ma and Li, 2019). While these studies have enriched our understanding of plant responses to environmental cues, there remains a need to unravel the mechanisms governing internode cell elongation in stem-forming plant species, as this area holds the potential to unveil novel insights into plant adaptation and growth under varying light conditions. Here, we focus on the gene expression changes in stem elongation during SAS in tomato, which was described in phenotypic detail in the previous chapter.
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