Figure 3. Photosynthetic rate and gene expression in lettuce subjected to unprotective conditions. Plants grown in protective conditions (P) were subjected to unprotective conditions for 6 d while control plants were continuously grown in unprtotective conditions (U). Leaf photosynthetic rates (A) were measured. The data indicate the means 7S.E. (n ¼ 3). Gene expressions for L-Ga l DH, g-TMT and PAL (B) were determined in protected plants in response to unprotected conditions. rRNAwas used as a loading standard