Figure 8.

Exogenous trehalose inhibits nectar production. To examine a potential role for trehalose in regulating nectar production, the peduncles of excised flowers were placed in solutions containing either 10 mm sorbitol (Sorb; osmotic control) or 10 mm trehalose (Tre). A to D, Nectary starch (A), nectar volume (B), nectary trehalose (C), and nectary Tre6P (D), all corrected for grams FW of nectary, are shown. E, Concentration (mole per liter) of Suc and Glc in the nectar. F to H, Total Suc (F), Glc (G), and total sugar (Suc+Glc) in Glc equivalents (H) of nectary and nectar, corrected for FW of nectary. *P ≤ 0.05 (2-tailed t test). Error bars represent SE (n = 3 for Tre6P; n = 6 for trehalose; n = 6 for Sorb samples in starch data; n = 7 for all other samples).