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Whole Plant Photosynthesis, Development, and Carbon Partitioning in Potato as a Function of Temperature

^a USDA-ARS-PSI, Crop Systems and Global Climate Change Lab., Bldg. 001, Room no. 342, BARC-W, 10300 Baltimore Ave., Beltsville, MD 20705-2350
^b Texas A&M Univ., 17360 Coit Road, Dallas, TX 75252
^c USDA-ARS Cropping Systems Research Lab., 302 West I-20 Big Spring, TX 79720
^d Univ. of Maryland, Dep. of Natural Resources Sciences and Landscape Architecture, Plant Science Bldg., Room 2130, College Park, MD 20742

View larger version (29K): [in a new window]   Fig. 1. Measured net photosynthetic rates (PN) and photosynthetically active solar radiation (PAR) as photosynthetic photon flux density (PPFD) for 1 d, 31 d after emergence (DAE) (22 Sept. 1999). The 12°C treatment is not shown. Data were recorded at 300 s intervals.

View larger version (31K): [in a new window]   Fig. 2. Canopy net photosynthetic rate (PN) estimated from polynomial regression at 1200 µmol m–2s–1 photosynthetic photo flux density (PPFD) for five temperatures throughout the growing season. Data are means of 900 s intervals. Gaps in the data result from days with low light levels that were not included in the analysis. The vertical bars indicate times when plants were removed from the chambers for destructive harvest.

View larger version (28K): [in a new window]   Fig. 3. Mean daily dark respiration (RD) as a function of temperature throughout the growing period. The error bars represent the variance about the mean. The vertical lines indicate the times plants were removed from the chambers for destructive harvest. PPFD = photosynthetic photon flux density.

View larger version (33K): [in a new window]   Fig. 4. Daily cumulative C gain (as grams of C per plant) and photosynthetic photon flux density (PPFD) throughout the growth period. The two vertical bars represent the times plants were removed from the chambers for destructive harvest. There were 16 plants up to the first harvest, 12 plants until the second harvest and eight plants until the final harvest at 52 DAE.

View larger version (22K): [in a new window]   Fig. 5. Total dry matter per plant as a function of total C gain over the growing period. The dotted lines show the trends with time within a temperature. The dark, solid line shows the linear regression for biomass = a + b (total C gain).