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. 2019 Jul 19;116(32):16127–16136. doi: 10.1073/pnas.1906405116

Fig. 6.

Fig. 6.

The SFT-TFUL2 module is conserved in the short-day wild tomato S. galapaganese (S.g.). (A) 35S:SFT induces flowering in S.g. under nonpermissive long days. (Left) A nonflowering 6-wk-old S.g. plant. (Right ) A flowering 6-wk-old 35S:SFT S.g. plant. (B) Graft-transmissible florigen stimulates flowering in the short-day species S.g. Donor tomato 35S:SFT scions (arrow) rescue flowering (arrow and asterisks) in WT S.g. recipients under nonpermissive long-day conditions. (C) 35S:SFT induces precocious SCW deposition and vascular maturation in the short–day S.g. grown under long-day conditions; cross-sections are from the first internodes of the plants shown in A. TBO staining for lignin. (D and E) TFUL2 enhances vascular differentiation independent of flowering in S.g. stems under long-day conditions. (D) Shoots of nonflowering WT and S.g. 35S:TFUL2 plants grown under long-day conditions. Both plants were completely devoid of inflorescence primordia. (E) Maturation status of the first internodes from the stems shown alongside in D. The S.g. 35S:TFUL2 plants formed approximately 30 concentric layers of lignified IF xylem fibers, but only 5 such layers evolved in WT plants. Note that the external phloem fibers (PF) in S.g. 35S:TFUL2 are already lignified, indicating complete differentiation. *IF zones. (Scale bars: 100 mm.)