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Photosynthesis and Seed Production under Water-Deficit Conditions in Transgenic Tobacco Plants That Overexpress an Arabidopsis Ascorbate Peroxidase Gene

Dep. of Biological Sci., Texas Tech Univ., Lubbock, TX 79409, USA

View larger version (34K): [in a new window]   Fig. 1. Seed weight per plant (A) and fruit number per plant (B) of transgenic (Y3 and B3) and control plants (Xnn) after repeated cycles of water deficit and their well-watered controls. The letters A and B indicate significant difference at the 0.05 level.

View larger version (41K): [in a new window]   Fig. 2. Leaf water potential (A), photosynthesis (B), and stomatal conductance (C) of transgenic (Y3 and B3) and control plants (Xnn) expressed as ratios from random pairing of values of water-deficit and well-watered plants. For water-deficit treatment D1 through D5, plants were watered with 100, 75, 50, 25, and 0% of the water needed to fully replenish control plants, respectively. After withholding water for 5 d (2 d after D5), the water-deficient plants were rewatered extensively in the morning, and then gas exchange parameters were measured at 5 h (R0) and the next day (R1). Values are means ± SD, n = 8 for water-deficit treatment, n = 5 for recovery stages.

View larger version (63K): [in a new window]   Fig. 3. Aboveground biomass (A) and total leaf area (B) of transgenic (Y3 and B3) and control plants (Xnn) expressed as ratios from random pairing of values of water-deficient and well-watered plants. D1, D2, D3, D4, and D5 indicate plants watered with 100, 75, 50, 25, and 0% of water needed to fully replenish control plants, respectively. Every treatment lasted for 3 d and all parameters were measured on the third day. Values are mean ± SD (n = 3).