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Elevated carbon dioxide influences yield and photosynthetic responses of hydroponically-grown sweetpotatoThe response of 'TI-155' and 'Georgia Jet' sweetpotato cultivars to elevated CO2 concentrations of 400 (ambient), 750 and 1000 micromoles mol-1 were evaluated under controlled environment conditions using the nutrient film technique (NFT). Growth chamber conditions included photosynthetic photon flux (PPF) of 600 micromoles m-2 s-1, 14/10 light/dark period, and 70% +/- 5% RH. Plants were grown using a modified half-Hoagland nutrient solution with a pH range of 5.5-6.0 and an electrical conductivity of 0.12 S m-1. Gas exchange measurements were made using infrared gas analysis, an open-flow gas exchange system, and a controlled-climate cuvette. Photosynthetic (Pn) measurements were made at CO2 ranges of 50 to 1000 micromoles mol-1. Storage root yield/plant increased with CO2 up to 750 but declined at 1000 micromoles mol-1. Storage root dry matter (DM) and foliage dry weight increased with increasing CO2. Harvest index (HI) for both cultivars was highest at 750 micromoles mol-1. The PPF vs Pn curves were typical for C3 plants with saturation occurring at approximately 600 micromoles m-2 s-1. CO2 concentration did not significantly influence net Pn, transpiration, water-use-efficiency (WUE), and stomatal conductance. As measurement CO2 concentration increased, net Pn and WUE increased while transpiration and stomatal conductance decreased.
Document ID
20040120533
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Mortley, D.
(Tuskegee University AL 36088, United States)
Hill, J.
Loretan, P.
Bonsi, C.
Hill, W.
Hileman, D.
Terse, A.
Date Acquired
August 22, 2013
Publication Date
December 1, 1996
Publication Information
Publication: Acta horticulturae
Volume: 440
ISSN: 0567-7572
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-2940
CONTRACT_GRANT: ALX-SP-1
Distribution Limits
Public
Copyright
Other

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