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Photosynthetic Response to Long- and Short-Term Changes in Carbon Dioxide in Sweetpotatoes Grown Hydroponically with Enhanced Mineral NutritionSweetpotato [Ipomoea batatas L.(Lam.)] has been selected by NASA as a potential food for long-term space missions. In previous experiments, sweetpotato plants grown hydroponically under elevated levels of CO2 depleted the nitrogen in the nutrient solution between the hi-weekly solution replacements. In this experiment, the effect of enhanced nutrient replenishment on photosynthetic rates of sweetpotato was determined. CO2 response curves were determined for "TU-82-155" and "Georgia-Jet" sweetpotatoes grown hydroponically in growth chambers at three different CO2 concentrations (400, 750, and 1000 micro-mol/mol CO2). Gas exchange measurements were made using infrared gas analysis, an open-flow gas exchange system, and a controlled-climate cuvette. Photosynthetic measurements were made at CO2 concentrations from 50-1000 micro-mol/mol CO2. Net photosynthetic rates showed an increase with increasing measurement CO2 in all nutrient regimes, but the response of photosynthetic rates to the growth CO2 conditions varied among the experiments and between the two varieties. Enhanced mineral nutrition led to increased net photosynthetic rates in "Georgia Jet" plants, but not in "TU-82-155" plants. The results of this study will help to determine the CO2 requirements for growth of sweetpotato on proposed space missions.
Document ID
20000032209
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Hamilton, Casey
(Tuskegee Inst. AL United States)
Terse, Anita
(Tuskegee Inst. AL United States)
Hileman, Douglas R.
(Tuskegee Inst. AL United States)
Mortley, Desmond G.
(Tuskegee Inst. AL United States)
Hill, Jill
(Tuskegee Inst. AL United States)
Date Acquired
August 19, 2013
Publication Date
February 22, 1998
Publication Information
Publication: NASA University Research Centers Technical Advances in Aeronautics, Space Sciences and Technology, Earth Systems Sciences, Global Hydrology, and Education
Volume: 2 and 3
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-2940
CONTRACT_GRANT: NCC9-51
CONTRACT_GRANT: USDA-ALX-FS-2
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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