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Photosynthesis, Carbohydrate Metabolism, and Yield of Phytochrome-B-Overexpressing Potatoes under Different Light Regimes

Inst. of Crop and Grassland Sci., Federal Agric. Res. Centre (FAL), Bundesallee 50, 38116 Braunschweig, Germany

View larger version (34K): [in a new window]   Fig. 1. Relative height of almost full-grown Dara-5 and wild-type potato plants depending on the minimum number of neighboring plants in the greenhouse experiment. The height of plants with at least four neighbors is set to 100%. Data are means ± 1 SE of six plants within the same distance level from the edge of the bench as determined at 73, 94, and 107 d after emergence.

View larger version (28K): [in a new window]   Fig. 2. Agronomic traits for Dara-5 and wild-type potato plants as a function of days after emergence in the greenhouse experiment. Vertical bars represent ±1 SE of the mean (n = 8) where these exceed the size of the symbol. GLA, green leaf area; SLW, specific leaf weight.

View larger version (28K): [in a new window]   Fig. 3. Photosynthesis related traits for Dara-5 and wild-type potato plants as a function of days after emergence in the greenhouse experiment. Leaf carbon exchange rate measurements were made at photosynthetic photon flux of 1500 µmol m–2 s–1. Vertical bars represent ±1 SE of the mean (n = 8) where these exceed the size of the symbol. CERmax, light-saturated carbon exchange rate; Chl, chlorophyll; gtw, total leaf conductance to water vapor; RNA, ribonucleic acid.

View larger version (27K): [in a new window]   Fig. 4. Response of leaf carbon exchange rate to alteration in photosynthetic photon flux (CER vs. PPF) of young fully expanded leaves of Dara-5 and wild-type potato plants measured (a) during vegetative growth (19 and 20 DAE), (b) at the beginning of flowering (33 and 34 DAE), (c) after attainment of three-quarters of leaf mass (47 and 48 DAE), and (d) at the cessation of leaf growth (75 and 76 DAE) in the greenhouse experiment. Each data point represents the mean of four measurements performed during different time periods within a day at CO2 partial pressure outside the leaf = 35 Pa. Vertical bars represent ±1 SE of the mean where these exceed the size of the symbol.

View larger version (37K): [in a new window]   Fig. 5. Water soluble carbohydrate (WSC), starch, and N concentration (left column) and total amounts (right column) in leaves, stems, tubers, and roots of Dara-5 and wild-type potato plants as a function of days after emergence in the greenhouse experiment. The root starch data are not shown for clarity. Vertical bars represent ±1 SE of the mean (n = 8) where these exceed the size of the symbol.

View larger version (32K): [in a new window]   Fig. 6. Leaf carbon exchange rate (CER), leaf conductance to water vapor (gtw), total chlorophyll (Chl) concentration, and total Rubisco carboxylase activity of the fifth leaf below the apex as a function of days after emergence for Dara-5 and wild-type potato plants grown in growth chambers at photosynthetic photon flux (PPF) of 300, 600, and 900 µmol m–2 s–1. The Dara-5 chlorophyll and Rubisco data for the last sampling date in the 900 µmol m–2 s–1 PPF treatment are not shown because of a sampling error. Vertical bars represent ±1 SE of the mean (n = 8) where these exceed the size of the symbol.

View larger version (32K): [in a new window]   Fig. 7. Sucrose, starch, and soluble protein concentration of the fifth leaf below the apex as a function of days after emergence for Dara-5 and wild-type potato plants grown in growth chambers at photosynthetic photon flux (PPF) of 300, 600, and 900 µmol m–2 s–1. The Dara-5 data for the last sampling date in the 900 µmol m–2 s–1 PPF treatment are not shown because of a sampling error. Vertical bars represent ±1 SE of the mean (n = 8) where these exceed the size of the symbol.