Figure 3.

Microtuber production in response to various sucrose concentrations in the dark. Stem cuttings from two independent transgenic lines (StSUT4-RNAi38 and StSUT4-RNAi 63) and WT potato plants from sterile tissue culture were transferred in MS-medium containing 5, 8, or 10% sucrose (w/v). Pictures were taken 10 days after transfer into the dark. The experiment was repeated three times independent experiments and one representative example is given. Note that microtuber production in the transgenic line StSUt4-RNAi #63 is induced by 5% sucrose (arrow). Microtuber induction experiments were performed with Solanum tuberosum ssp. tuberosum plants of the variety Désirée.