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KMID : 0380119810040000114
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Korean Journal of Ecology
1981 Volume.4 No. 0 p.114 ~ p.123
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A Study on Characteristics of Crassulacean Acid Metabolism in Leaves and Stems of Portulaca Oleracea L.
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Abstract
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Diutnal acid fluctuations, stomatal resistance, and morphology and anatomy were investigated in leaves and stems P. oleracea L. growing under the natural environmental condition.
A CAM-like pattern of acid fluctuations was exhibited not in leaves of the young purslane but in its stems. Defoliated stems showed a decrease in diurnal changes of total acidity as compared with normal stems. Excised stems stored in continuous darkness exhibited diurnal acid rhythms, and they showed light deacidifications for three days.
Kranz-type arrangement was observed in leaves, but not in stems. Micrograph of cross sections of stems showed cells with relatively large vaculoles and a few chloroplasts. The number of stomata was 3,275㎝^-2 in leaves, while the stomata could not be observed in stems. Stomatal resistance was high at night and low in daytime in leaves of the young purslane, and the range of its value was 5∼40 sec. ㎝^-1. But stomatal resistance in leaves of the water-stressed plant was comparatively high in day time, and its value was 30 sec. ㎝^-1.
The result of these studies showed the possibility that the stem of P. oleracea L. possesses CAM under certain stressed conditions.
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