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. 2022 Oct 26;11(21):2857. doi: 10.3390/plants11212857

Figure 3.

Figure 3

Schematic model of the effect of tropicalization on tuberization. Temperature plays an important role in the expression of essential genes responsible for tuberization. The master regulator for tuberization in potato is the FT(StSP6A) gene responsible for tuberization under normal/ambient temperature conditions. Different TFs and miRNA also control the process of tuberization through an StSP6A-mediated mechanism. TFs such as CDF1 and StBEL5 upregulate the expression of StSP6A, whereas miR172 also upregulates this gene, leading to tuberization. However, when the potato is grown in tropical conditions and is subjected to high temperatures, tuberization is inhibited. An FT family member, SP5G downregulates the expression of the StSP6A gene. The former SP5G is reported to be regulated positively by StCOL1 expression. Moreover, miR156 also negatively controls the expression of StSP6A, which ultimately inhibits tuberization. CONSTANS-LIKE protein 1: StCOL1; CYCLING DOF FACTOR 1: StCDF1; BELLRINGER-1 LIKE 5: StBEL5.