Figure 3

Morphology of Lada and ST plants. (A) Four-week-old plants grown in vitro under standard culture conditions (3% sucrose); (B) Sprouting of tubers stored for six months at 4°C; (C) Arrangement of tubers on three-month-old plants cultivated in pots under 15/9 (L/D) photoperiod; (D) Phenotype of four-week-old plants grown from tubers in pots under continuous light; (E) Detailed view on tuberization of ST plant grown under continuous light; note swelling buds, which are going to form sessile tubers; (F) Single-node cuttings of ST plants cultured in vitro on media with variable levels of sucrose (5% or 7% suc) under high (HL) or low (LL) irradiance (PPFD of 400–500 or 50–60 μmol m^-2 s^-1, respectively); cuttings are arranged from the most basal segment on the left to the apical one on the right; (G) Tuberization of single-node cuttings cultured on the tuberization medium in darkness for five weeks; (H) Three-week-old plants grown in the light on the medium supplemented with 5% sucrose and 3 mg/l GA₃.