FIGURE 2.

Hypothetical model representing transcriptional regulatory mechanisms leading to differences in germination and coleoptile elongation of diverse rice genotypes in response to submergence tolerance. TFs acting as activators/repressors along with hormonal signaling induce the synthesis of cell building blocks for elongation of coleoptiles in response to submergence in rice genotypes from diverse backgrounds. The differences in the length of coleoptiles could be due to altered transcriptional regulatory mechanisms involving bHLH and BES/BZR TFs together with other TFs and a cross-talk between BR and other signaling pathways. The dashed lines represent the hypothesis predicted from the gene expression data of tolerant, highly tolerant, and extremely tolerant genotypes that exhibit differences in coleoptile elongation in response to submergence tolerance.