ISSN:
1573-5036
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary The uptake of Mn and B by barley plants was studied in a 5-week period in growth chambers. Fluorescent light was provided with an intensity of 3200 foot-candles in a 12-hour day length and the entire plants were grown at temperatures of 10°, 15°, or 20°C. The root medium consisted of a base nutrient solution in which Mn or B was added in the following concentrations: 0, 0.1, 0.5, 2.0, and 5.0 ppm. Five plants were grown in volumes of 20 liters of solution. At the end of the growth period the shoots and roots were analyzed for Mn and B. The Mn content of the roots increased with temperature and with the Mn concentration of the external solution while the B content remained virtually static regardless of temperature or solution concentration. The shoots were divided into young, mature, and old leaves. The Mn and B content of the old leaves showed increases which varied both with temperature and concentration. Similar results were obtained with young and mature leaves. The failure of B to accumulate in the roots was discussed. It was suggested that boric acid, with a very low degree of dissociation, is present largely in a molecular form and does not participate in the customary metabolic activity connected with ion uptake and accumulation in roots.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01378251
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