Interaction of enriched CO2 and water stress on the physiology of and biomass production in sweet potato grown in open-top chambers |
| |
Authors: | N C BHATTACHARYA D R HILEMAN P P GHOSH R L MUSSER S BHATTACHARYA P K BISWAS |
| |
Institution: | Department of Agricultural Sciences, Tuskegee University, Tuskegee, Alabama 36088, U.S.A.;Department of Biology, Tuskegee University, Tuskegee, Alabama 36088, U.S.A.;Duke University Phytotron, Duke University, Durham, North Carolina, NC 27706, U.S.A. |
| |
Abstract: | Abstract. The objective of this study was to investigate the effects of water stress in sweet potato ( Ipomoea batatas L. Lam] 'Georgia Jet') on biomass production and plant-water relationships in an enriched CO2 atmosphere. Plants were grown in pots containing sandy loam soil (Typic Paleudult) at two concentrations of elevated CO2 and two water regimes in open-top field chambers. During the first 12 d of water stress, leaf xylem potentials were higher in plants grown in a CO2 concentration of 438 and 666 μmol mol?1 than in plants grown at 364 μmol mol?1. The 364 μmol mol?1 CO2 grown plants had to be rewatered 2 d earlier than the high CO2-grown plants in response to water stress. For plants grown under water stress, the yield of storage roots and root: shoot ratio were greater at high CO2 than at 364 μmol mol?1; the increase, however, was not linear with increasing CO2 concentrations. In well-watered plants, biomass production and storage root yield increased at elevated CO2, and these were greater as compared to water-stressed plants grown at the same CO2 concentration. |
| |
Keywords: | Ipomoea batatas L carbon dioxide storage roots stomatal conductance |
|
|