TY - JOUR
T1 - Effect of elevated CO 2 on growth and crassulacean-acid-metabolism activity of Kalanchoe pinnata under tropical conditions
AU - Winter, Klaus
AU - Richter, Andreas
AU - Engelbrecht, Bettina
AU - Posada, Juan
AU - Virgo, Aurelio
AU - Popp, Marianne
N1 - Funding Information:
We thank Elisabeth King, Catherine Lovelock and Joseph Wright for critical comments on an earlier version of the manuscript. This work was supported by The Andrew W. Mellon Foundation.
PY - 1997
Y1 - 1997
N2 - Kalanchoe pinnata (Lam.) Pers. (Crassulaceae), a succulent-leaved crassulacean-acid-metabolism plant, was grown in open-top chambers at ambient and elevated (two times ambient) CO 2 concentrations under natural conditions at the Smithsonian Tropical Research Institute, Republic of Panama. Nocturnal increase in titratable acidity and nocturnal carbon gain were linearly related, increased with leaf age, and were unaffected by CO 2 treatments. However, under elevated CO 2, dry matter accumulation increased by 42-51%. Thus, the increased growth at elevated CO 2 was attributable entirely to increased net CO 2 uptake during daytime in the light. Malic acid was the major organic acid accumulated overnight. Nocturnal malate accumulation exceeded nocturnal citrate accumulation by six- to eightfold at both CO 2 concentrations. Basal (predawn) starch levels were higher in leaves of plants grown at elevated CO 2 but diurnal fluctuations of starch were of similar magnitude under both ambient and elevated CO 2. In both treatments, nocturnal starch degradation accounted for between 78 and 89% of the nocturnal accumulation of malate and citrate. Glucose, fructose, and sucrose were not found to exhibit marked day-night fluctuations.
AB - Kalanchoe pinnata (Lam.) Pers. (Crassulaceae), a succulent-leaved crassulacean-acid-metabolism plant, was grown in open-top chambers at ambient and elevated (two times ambient) CO 2 concentrations under natural conditions at the Smithsonian Tropical Research Institute, Republic of Panama. Nocturnal increase in titratable acidity and nocturnal carbon gain were linearly related, increased with leaf age, and were unaffected by CO 2 treatments. However, under elevated CO 2, dry matter accumulation increased by 42-51%. Thus, the increased growth at elevated CO 2 was attributable entirely to increased net CO 2 uptake during daytime in the light. Malic acid was the major organic acid accumulated overnight. Nocturnal malate accumulation exceeded nocturnal citrate accumulation by six- to eightfold at both CO 2 concentrations. Basal (predawn) starch levels were higher in leaves of plants grown at elevated CO 2 but diurnal fluctuations of starch were of similar magnitude under both ambient and elevated CO 2. In both treatments, nocturnal starch degradation accounted for between 78 and 89% of the nocturnal accumulation of malate and citrate. Glucose, fructose, and sucrose were not found to exhibit marked day-night fluctuations.
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U2 - 10.1007/s004250050081
DO - 10.1007/s004250050081
M3 - Article
AN - SCOPUS:0030998498
SN - 0032-0935
VL - 201
SP - 389
EP - 396
JO - Planta
JF - Planta
IS - 4
ER -