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Title: MODELING GROWTH, DEVELOPMENT, AND PHOTOSYNTHESIS IN POTATO (SOLANUM TUBEROSUM L.) UNDER ELEVATED CO2

Author
item Timlin, Dennis
item RAHMAN, LUTFOR - TEXAS A&M, DALLAS, TX
item Kim, Soo Hyung
item Baker, Jeffrey
item Reddy, Vangimalla
item QUEBEDEAUX, B - U OF MD, COLLEGE PARK, MD
item FRAISSE, C - WA ST UNIV, PULLMAN, WA
item Alva, Ashok

Submitted to: Models for Plant Growth and Control of Product Quality in Hoticultural Production
Publication Type: Abstract Only
Publication Acceptance Date: 8/25/2003
Publication Date: 8/25/2003
Citation: Timlin, D.J., Rahman, L., Kim, S., Baker, J.T., Reddy, V., Quebedeaux, B., Fraisse, C., Alva, A.K. 2003. Modeling growth, development, and photosynthesis in potato (solanum tuberosum l.) under elevated co2 [abstract]. Models for Plant Growth and Control of Product Quality in Hoticultural Production.

Interpretive Summary:

Technical Abstract: This research is part of a larger project to develop a mechanistic simulation model (2DSPUD) which will be useful for potato growers to quantify phenological growth and development to assist in management decisions. The potato plant model is interfaced with a two-dimensional, finite element model of soil processes called 2DSOIL. The objective of this particular study was to quantify the effect of temperature on phenological growth and development of potato cv. Atlantic under super ambient atmospheric carbon dioxide concentration (700 ppm CO2). Potato plants (Solanum tuberosum L.) were grown in a nearly natural environment using day lit plant growth chambers with temperatures as a controlled variable. Non destructive data on plant height and main stem node number in each chamber were collected at four day, or weekly intervals. Destructive harvesting was done at 20, 34 and 54 days after emergence. Photosynthetic rates were measured by measuring CO2 uptake over time. Six temperatures were used, 12, 16, 20, 24, 28 and 32 Celcius. The optimum temperature for photosynthesis and leaf area development was 24 degrees C although the node addition rate did not decrease at temperatures above 24 degrees. The photosynthesis data were used to evaluate a coupled model of leaf level photosynthesis and stomatal resistance.