Changes in the Acidity of Bryophyllum Calycinum
نویسنده
چکیده
In studies on the hydrogen ion concentration gradient and total acidity in plants it was noticed that these varied greatly in Bryophyllure calycinum with the light conditions of the day; on a cloudy day the H ion concentration and total acidity were very high, while on a bright sunny day they were 10w. ~ From this it was inferred that there might be diurnal changes in these concentrations. Reference to literature shows that in 1813 Benjamin Heyne ~ reported that the tropical plant BryophylIum (Cotyledon) calycinum tasted as sour as sorrel early in the morning, but by noon was tasteless. This was verified by Link, with litmus paper. He also found that light was responsible for the disappearance of the acid. (This is quoted b y Kraus3) Mayer,* Kraus, Warburg, 5 and others have shown that this plant is acid during the night and that the acidity decreases during
منابع مشابه
Diurnal Changes in the Acidity of Bryophyllum Calycinum
1. It has been shown that there is a diurnal change in the H ion concentration in Bryophyllum calycinum corresponding approximately to the total acidity changes. The H ion concentration increases at night and decreases during the day. 2. Light is the main factor in causing the decrease in acidity, though it also occurs in the dark. but much more slowly. 3. External oxygen tension does not seem ...
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When Bryophyllum calycimum leaves are detached from the plant and cultured in water in darkness at ordinary room temperature, the course of the changes in composition with respect to the organic acids, the protein and the starch depends upon the time of day at which the samples were collected (5). If leaves are taken in the afternoon at a time of low acidity and low protein content, there is a ...
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In an earlier study of the diurnal variation of organic acids and starch in excised leaves of Bryophyllum calycinum (3), it was observed that the quantity of isocitric acid present did not change significantly during a threeday period of culture in water under greenhouse conditions of illumination. Because of the contrast between the behavior of this substance and that of malic and citric acids...
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It has been known since the work of Mayer (1) in 1875 that the thick succulent leaves of many plants of the family Crassulaceae become enriched in titratable organic acids during the night and diminish in acid content when the leaves are illuminated. An analogous diurnal variation in acidity has been observed in a number of other succulents, and occasionally in species of different growth habit...
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