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- W2087900272 abstract "ABSTRACT The effect of increased levels of carbon dioxide on the growth (fresh weight), morphogenesis (formation of leaves, roots and shoots) and tissue concentrations of the naphthodianthrones (hypericin and pseudohypericin) was determined for St. John's Wort (Hypericum perforatum L.). Plants, started from shoot cuttings in a vermiculite-peat moss mixture within a greenhouse employing natural sunlight, were grown for eight weeks under CO2 levels of 350, 1500, 3000, 10,000 and 30,000 μl CO2/liter atmospheres. Elevated CO2 levels (≥ 1500 μl CO2/liter) significantly increased growth and morphogenesis compared with ambient (350 μl CO2/liter) levels (control). Levels of hypericin were significantly higher at 1500 and 3000 μl CO2/liter than at ambient CO2, while the higher (10,000 and 30,000 μl CO2/liter) CO2 atmospheres caused reductions in levels of both naphthodianthrones in plant tissues. Because of increased plant growth, however, naphthodianthrone yields were significantly increased at elevated CO2 levels as compared with controls." @default.
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- W2087900272 date "2003-07-17" @default.
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- W2087900272 title "Ultrahigh Carbon Dioxide Atmospheres Increase the Growth Rate, Morphogenesis and Naphthodianthrone Levels in St. John's Wort (<i>Hypericum perforatum</i>) Plants" @default.
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