Changes in the Acidity of Bryophyllum Calycinum

نویسنده

  • Benjamin Heyne
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

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Diurnal Changes in the Acidity of Bryophyllum Calycinum

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تاریخ انتشار 2003