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Effects of several environmental factors on sweetpotato growthEffects of relative humidity, light intensity and photoperiod on growth of 'Ga Jet' and TI-155' sweetpotato cultivars, using the nutrient film technique (NFT), have been reported. In this study, the effect of ambient temperature regimes (constant 28 C and diurnal 28:222 C day:night) and different CO2 levels (ambient, 400, 1 000 and 10 000 microL/L-400, 1 000 and 10 000 ppm) on growth of one or both of these cultivars in NFT are reported. For a 24-h photoperiod, no storage roots were prodcued for either cultivar in NFT when sweetpotato plants were grown at a constant temperature of 28 C. For the same photoperiod, when a 28:22 C diurnal temperature variation was used, there were still no storage roots for 'TI-155' but the cv. 'Ga Jet' produced 537 g/plant of storage roots. For both a 12-h and 24-h photoperiod. 'Ga Jet' storage root fresh and dry weight tended to be higher with a 28:22 C diurnal temperature variation than with a constant 28 C temperature regime. Preliminary results with both 'Ga Jet' and 'TI-155' cultivars indicate a distinctive diurnal stomatal response for sweetpotato grown in NFT under an ambient CO2 level. The stomatal conductance values observed for 'Ga Jet' at elevated CO2 levels indicated that the difference between the light- and dark-period conductance rates persisted at 400, 1 000, and 10 000 microL/L.
Document ID
19950062195
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Loretan, P. A.
(Tuskegee University Tuskegee, Alabama, US, United States)
Bonsi, C. K.
(Tuskegee University Tuskegee, Alabama, US, United States)
Mortley, D. G.
(Tuskegee University Tuskegee, Alabama, US, United States)
Wheeler, R. M.
(NASAKennedy Space Center Kennedy Space Ctr, Florida, US, United States)
Mackowiak, C. L.
(NASAKennedy Space Center Kennedy Space Ctr, Florida, US, United States)
Hill, W. A.
(Tuskegee University Tuskegee, Alabama, US, United States)
Morris, C. E.
(Tuskegee University Tuskegee, Alabama, US, United States)
Trotman, A. A.
(Tuskegee University Tuskegee, Alabama, US, United States)
David, P. P.
(Tuskegee University Tuskegee, Alabama, US, United States)
Date Acquired
August 16, 2013
Publication Date
November 1, 1994
Publication Information
Publication: Life sciences and space research 25 (3): Natural and artificial ecosystems; Meeting F4 of the COSPAR Plenary Meeting, 29th, Washington, DC, Aug. 28-Sep. 5, 1992 . A95-93759
Volume: 14
Issue: 11
ISSN: 0273-1177
Subject Category
Life Sciences (General)
Accession Number
95A93794
Funding Number(s)
CONTRACT_GRANT: NAG10-0024
CONTRACT_GRANT: NAGW-2940
Distribution Limits
Public
Copyright
Other

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