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- W334569194 abstract "Carbon assimilation is often increased by CO{sub 2} enrichment, but the response of dark respiration and carbohydrate metabolism to elevated CO{sub 2} is less well documented. The authors examined the diurnal response of these two processes in yellow-poplar (Liriodendron tulipifera L.) and white oak (Quercus alba L.) seedling exposed to CO{sub 2} enrichment under field conditions. One-year-old seedlings of yellow-poplar and white oak were grown in open-top chambers and exposed to ambient, +150 {mu}mol mol{sup {minus}1}, or +300 {mu}mol mol{sup {minus}1} CO{sub 2} concentrations. After 24 weeks, mature leaves of yellow-poplar and white oak seedlings grown at high CO{sub 2} showed a 37% and 52% reduction in nighttime respiration, respectively. Morning starch levels for yellow-poplar and white oak grown at +300 {mu}mol mol{sup {minus}1} increased 72% and 40%, respectively, compared to ambient-grown plants. Yellow-poplar and white oak seedlings grown at high CO{sub 2} contained 17% and 27% less morning sucrose, respectively than did plants grown at ambient CO{sub 2} concentration. Starch accumulation and the subsequent depletion of sucrose for plants grown under CO{sub 2} enrichment, resulted in a pronounced rise in the starch/sucrose ratio with increasing CO{sub 2} concentration. The diurnal pattern of dark respiration suggested that a relationship withmore » carbohydrate status might exist.« less" @default.
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- W334569194 date "1991-05-01" @default.
- W334569194 modified "2023-09-24" @default.
- W334569194 title "Dark respiration and carbohydrate status of two forest species grown in elevated carbon dioxide. [Liriodendron tulipifera L. ; Quercus alba L]" @default.
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